organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

Three-dimensional supramolecular structures in (E,E)-N,N′-bis­­(4-nitro­benzyl­­idene)butane-1,4-di­amine and (E,E)-N,N′-bis­­(4-nitro­benzyl­­idene)­hexane-1,6-di­amine

CROSSMARK_Color_square_no_text.svg

aSchool of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland, bDepartment of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB24 3UE, Scotland, and cInstituto de Química, Departamento de Química Inorgânica, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil
*Correspondence e-mail: cg@st-andrews.ac.uk

(Received 28 October 2005; accepted 1 November 2005; online 10 December 2005)

In both (E,E)-N,N′-bis­(4-nitro­benzyl­idene)butane-1,4-diamine, C18H18N4O4, (III)[link], and (E,E)-N,N′-bis­(4-nitro­benzyl­idene)hexane-1,6-diamine, C20H22N4O4, (IV)[link], the mol­ecules lie across centres of inversion in space groups P[\overline{1}] and P21/c, respectively. In (III)[link], the three-dimensional supramolecular structure is built from π-stacked chains of edge-fused R22(30) rings, while in (IV)[link], chains of edge-fused R22(38) rings are linked by dipolar nitro–nitro inter­actions.

Comment

In this paper, we describe the structures of two compounds in the series 4-O2NC6H4CH=N–(CH2)n–N=CHC6H4NO2, viz. for n = 4, compound (III)[link], or n = 6, compound (IV)[link] (see scheme). We have recently reported the mol­ecular and supramolecular structures of N,N′-bis­(4-nitro­benzyl­idene)­ethane-1,2-diamine, (II), where n = 2 (Bomfim et al., 2005[Bomfim, J. A. S., Wardell, J. L., Low, J. N., Skakle, J. M. S. & Glidewell, C. (2005). Acta Cryst. C61, o53-o56.]). The mol­ecules of (II), which lie across centres of inversion in the space group P21/n, are linked into sheets by a single C—H⋯O hydrogen bond, and these sheets are further linked by an aromatic ππ stacking inter­action. By contrast, in (E,E)-1-(3-nitro­phen­yl)-4-(4-nitro­phen­yl)-2,3-diaza-1,3-butadiene, (I), where there are no methyl­ene groups between the two –CH=N– units, the centrosymmetric mol­ecules are linked directly into a three-dimensional framework structure by means of two independent C—H⋯O hydrogen bonds (Glidewell et al., 2006[Glidewell, C., Low, J. N., Skakle, J. M. S. & Wardell, J. L. (2006). In preparation.]). Intrigued by the differences in the aggregation patterns of these two compounds, we have now undertaken a more extended study involving compounds (III)[link] and (IV)[link], and report their structures here.

Compounds (I)–(IV) all lie across centres of inversion and all have the E,E configuration at the C=N double bonds. In each of compounds (III)[link] and (IV)[link] (Figs. 1[link] and 2[link]), the reference mol­ecule was selected, for the sake of convenience, as that centred across ([{1 \over 2}, {1 \over 2}, {1 \over 2}]) in the space groups P[\overline{1}] and P21/c, respectively.

[Scheme 1]

In each of compounds (II)–(IV), the nitro groups are essentially coplanar with the adjacent aryl rings, as shown by the relevant torsion angles (Table 1[link]) and, likewise, the C1—C11—N11—C12 fragments are effectively coplanar with these rings. However, the skeletons in the polymethyl­ene spacer units adopt conformations which are very far from planar.

In compound (III)[link] (Fig. 1[link]), the mol­ecules are linked into chains of edge-fused rings, which can alternatively be described as mol­ecular ladders, by a single C—H⋯O hydrogen bond (Table 2[link]), and these chains are further linked into a three-dimensional framework by two independent ππ stacking inter­actions. The methine C11 atoms at (x, y, z) and (1 − x, 1 − y, 1 − z) are parts of the mol­ecule centred at ([{1 \over 2}, {1 \over 2}, {1 \over 2}]). These atoms act as hydrogen-bond donors to the nitro atoms O42 at (x, y, 1 + z) and (1 − x, 1 − y, −z), respectively, which themselves are parts of the mol­ecules centred at ([{1 \over 2}, {1 \over 2}, {3 \over 2}]) and ([{1 \over 2}, {1 \over 2}, -{1 \over 2}]), respectively. Propagation by translation and inversion of this single hydrogen bond then generates a chain of edge-fused R22(30) rings (Bernstein et al., 1995[Bernstein, J., Davis, R. E., Shimoni, L. & Chang, N.-L. (1995). Angew. Chem. Int. Ed. Engl. 34, 1555-1573.]) running along ([{1 \over 2}, {1 \over 2}, z]) (Fig. 3[link]).

The aryl rings at (x, y, z) and (−x, 1 − y, −z), which form parts of mol­ecules centred at ([{1 \over 2}, {1 \over 2}, {1 \over 2}]) and ([-{1 \over 2}, {1 \over 2}, -{1 \over 2}]), are strictly parallel, with an inter­planar spacing of 3.738 (2) Å; the centroid separation is 3.377 (2) Å, corresponding to a ring offset of 1.602 (2) Å. Propagation by inversion of this stacking inter­action then generates a chain running parallel to the [101] direction (Fig. 4[link]). Similarly, the rings at (x, y, z) and (−x, 2 − y, −z) are parallel, with an inter­planar spacing of 3.630 (2) Å, and a centroid separation and offset of 3.378 (2) and 1.327 (2) Å, respectively. This stacking inter­action generates a chain parallel to the [1[\overline{1}]1] direction (Fig. 5[link]). The combination of the [001], [101] and [1[\overline{1}]1] chains suffices to link all of the mol­ecules into a single three-dimensional structure.

In compound (IV)[link] (Fig. 2[link]), the mol­ecules are linked by a single C—H⋯O hydrogen bond (Table 2[link]), but aromatic ππ stacking inter­actions are absent from the structure. Instead, the hydrogen-bonded chains are linked, again into a three-dimensional structure, by a single dipolar nitro–nitro inter­action. The aryl C2 atoms at (x, y, z) and (1 − x, 1 − y, 1 − z) act as hydrogen-bond donors to nitro atoms O42 at (−1 + x, −1 + y, z) and (2 − x, 2 − y, 1 − z), which are themselves parts of the mol­ecules centred at ([-{1 \over 2}, -{1 \over 2}, {1 \over 2}]) and ([{3 \over 2}, {3 \over 2}, {1 \over 2}]), respectively. Propagation of this single hydrogen bond thus generates a chain of edge-fused R22(38) rings running parallel to the [110] direction (Fig. 6[link]).

Nitro atom O41 at (x, y, z) forms a short dipolar contact with nitro atom N4 at (3 − x, [{1\over 2}] + y, [{3\over 2}] − z); the dimensions of this contact are N⋯O = 2.893 (2) Å, N—O⋯N = 117.2 (2)° and O⋯N—C = 118.4 (2)°; so that it is somewhat reminiscent of the type I (perpendicular) dipolar carbonyl–carbonyl inter­action (Allen et al., 1998[Allen, F. H., Baalham, C. A., Lommerse, J. P. M. & Raithby, P. R. (1998). Acta Cryst. B54, 320-329.]). In this manner, the mol­ecule centred at ([{1 \over 2}, {1 \over 2}, {1 \over 2}]) acts as donor to the mol­ecules centred at ([{5 \over 2}, 1, 1]), and ([-{3 \over 2}, 0, 0]) and as acceptor from those centred at ([{5 \over 2}, 0, 1]) and ([-{3 \over 2}, 1, 0]), so generating a ([\overline{1}]04) sheet in the form of a (4,4)-net built from a single type of R44(46) ring (Starbuck et al., 1999[Starbuck, J., Norman, N. C. & Orpen, A. G. (1999). New J. Chem. 23, 969-972.]) (Fig. 7[link]). The combination of these sheets and the hydrogen-bonded [110] chains links all the mol­ecules into a single three-dimensional framework.

Hence, although compounds (I)[link]–(IV)[link] all form three-dimensional supramolecular structures, no two exhibit the same range of direction-specific inter­molecular inter­actions, and the details of the framework formation are different for each.

[Figure 1]
Figure 1
The mol­ecule of compound (III)[link], showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. Atoms labelled with the suffix `a' are at the symmetry position (1 − x, 1 − y, 1 − z).
[Figure 2]
Figure 2
The mol­ecule of compound (IV)[link], showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. Atoms labelled with the suffix `a' are at the symmetry position (1 − x, 1 − y, 1 − z).
[Figure 3]
Figure 3
A stereoview of part of the crystal structure of (III)[link], showing the formation of a chain of edge-fused R22(30) rings along [001]. For the sake of clarity, H atoms not involved in the motif shown have been omitted.
[Figure 4]
Figure 4
A stereoview of part of the crystal structure of (III)[link], showing the formation of a π-stacked chain along [101]. For the sake of clarity, all H atoms have been omitted.
[Figure 5]
Figure 5
A stereoview of part of the crystal structure of (III)[link], showing the formation of a π-stacked chain along [1[\overline{1}]1]. For the sake of clarity, all H atoms have been omitted.
[Figure 6]
Figure 6
Part of the crystal structure of (IV)[link], showing the formation of a chain of edge-fused R22(38) rings along [110]. For the sake of clarity, H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*), hash (#), ampersand (&), dollar sign ($) or `at' symbol (@) are at the symmetry positions (1 − x, 1 − y, 1 − z), (−1 + x, −1 + y, z), (1 + x, 1 + y, z), (2 − x, 2 − y, 1 − z) and (−x, −y, 1 − z), respectively.
[Figure 7]
Figure 7
A stereoview of part of the crystal structure of (IV)[link], showing the formation of a ([\overline{1}]04) sheet of R44(46) rings generated by the dipolar nitro–nitro inter­action. For the sake of clarity, all H atoms have been omitted.

Experimental

A solution of 4-nitro­benzaldehyde (8 mmol) and 1,4-diamino­butane (4 mmol) in methanol (25 ml) was heated under reflux for 30 min. After cooling, the solvent was removed under reduced pressure and the product was recrystallized from methanol–1,2-dichloro­ethane (1:1 v/v) to yield crystals of (III)[link] suitable for single-crystal X-ray diffraction (m.p. 438–439 K). Compound (IV)[link] was prepared in a similar way from 4-nitro­benzaldehyde and 1,6-diamino­hexane, but it was recrystallized from 1,2-dichloro­ethane (m.p. 408–410 K).

Compound (III)[link]

Crystal data
  • C18H18N4O4

  • Mr = 354.36

  • Triclinic, [P \overline 1]

  • a = 7.1162 (4) Å

  • b = 7.1895 (2) Å

  • c = 9.1695 (4) Å

  • α = 83.210 (3)°

  • β = 78.920 (2)°

  • γ = 64.808 (3)°

  • V = 416.25 (3) Å3

  • Z = 1

  • Dx = 1.414 Mg m−3

  • Mo Kα radiation

  • Cell parameters from 1895 reflections

  • θ = 3.1–27.6°

  • μ = 0.10 mm−1

  • T = 120 (2) K

  • Lath, colourless

  • 0.46 × 0.34 × 0.13 mm

Data collection
  • Nonius KappaCCD area-detector diffractometer

  • φ and ω scans

  • Absorption correction: multi-scan(SADABS; Sheldrick, 2003[Sheldrick, G. M. (2003). SADABS. Version 2.10. University of Göttingen, Germany.])Tmin = 0.944, Tmax = 0.987

  • 8689 measured reflections

  • 1895 independent reflections

  • 1589 reflections with I > 2σ(I)

  • Rint = 0.028

  • θmax = 27.6°

  • h = −9 → 9

  • k = −9 → 9

  • l = −11 → 11

Refinement
  • Refinement on F2

  • R[F2 > 2σ(F2)] = 0.040

  • wR(F2) = 0.114

  • S = 1.05

  • 1893 reflections

  • 118 parameters

  • H-atom parameters constrained

  • w = 1/[σ2(Fo2) + (0.0652P)2 + 0.1082P] where P = (Fo2 + 2Fc2)/3

  • (Δ/σ)max < 0.001

  • Δρmax = 0.26 e Å−3

  • Δρmin = −0.34 e Å−3

Compound (IV)[link]

Crystal data
  • C20H22N4O4

  • Mr = 382.42

  • Monoclinic, P 21 /c

  • a = 6.1908 (3) Å

  • b = 4.9761 (2) Å

  • c = 30.1095 (15) Å

  • β = 94.331 (3)°

  • V = 924.91 (7) Å3

  • Z = 2

  • Dx = 1.373 Mg m−3

  • Mo Kα radiation

  • Cell parameters from 2083 reflections

  • θ = 3.3–27.6°

  • μ = 0.10 mm−1

  • T = 120 (2) K

  • Lath, colourless

  • 0.44 × 0.30 × 0.12 mm

Data collection
  • Nonius KappaCCD area-detector diffractometer

  • φ and ω scans

  • Absorption correction: multi-scan(SADABS; Sheldrick, 2003[Sheldrick, G. M. (2003). SADABS. Version 2.10. University of Göttingen, Germany.])Tmin = 0.952, Tmax = 0.988

  • 7409 measured reflections

  • 2083 independent reflections

  • 1516 reflections with I > 2σ(I)

  • Rint = 0.041

  • θmax = 27.6°

  • h = −8 → 7

  • k = −6 → 6

  • l = −31 → 39

Refinement
  • Refinement on F2

  • R[F2 > 2σ(F2)] = 0.045

  • wR(F2) = 0.113

  • S = 1.06

  • 2083 reflections

  • 127 parameters

  • H-atom parameters constrained

  • w = 1/[σ2(Fo2) + (0.0532P)2 + 0.2054P] where P = (Fo2 + 2Fc2)/3

  • (Δ/σ)max = 0.001

  • Δρmax = 0.19 e Å−3

  • Δρmin = −0.30 e Å−3

Table 1
Selected torsion angles (°) for compounds (II)[link]–(IV)[link]

Parameter (II)[link] (III)[link] (IV)[link]
C3—C4—N4—O41 −5.86 (15) 0.96 (15) −2.3 (2)
C2—C1—C11—N11 177.91 (9) −171.77 (10) 172.20 (15)
C1—C11—N11—C12 −176.58 (8) −179.54 (9) −179.72 (12)
C11—N11—C12—C12i 118.31 (13)    
C11—N11—C12—C13   111.42 (11) 111.90 (15)
N11—C12—C13—C13i   −65.67 (15)  
N11—C12—C13—C14     −70.53 (15)
C12—C13—C14—C14i     −179.76 (15)
Symmetry code: (i) 1-x, 1-y, 1-z.
†Data for compound (II)[link] from Bomfim et al. (2005[Bomfim, J. A. S., Wardell, J. L., Low, J. N., Skakle, J. M. S. & Glidewell, C. (2005). Acta Cryst. C61, o53-o56.]).

Table 2
Hydrogen-bond geometry (Å, °) for compounds (III)[link] and (IV)[link]

Compound D—H⋯A D—H H⋯A DA D—H⋯A
(III)[link] C11—H11⋯O42i 0.95 2.60 3.502 (2) 159
(IV)[link] C2—H2⋯O42ii 0.95 2.50 3.349 (2) 149
Symmetry codes: (i) x, y, 1+z; (ii) -1+x, -1+y, z.

Crystals of compound (III)[link] are triclinic. The space group P[\overline{1}] was selected and confirmed by the subsequent structure analysis. For compound (IV)[link], the space group P21/c was uniquely determined from the systematic absences. All H atoms were located in difference maps and then treated as riding atoms, with C—H distances of 0.95 or 0.99 Å, and with Uiso(H) = 1.2Ueq(C).

For both compounds, data collection: COLLECT (Nonius, 1998[Nonius (1998). COLLECT. Nonius BV, Delft, The Netherlands.]); cell refinement: DENZO (Otwinowski & Minor, 1997[Otwinowski, Z. & Minor, W. (1997). Methods in Enzymology, Vol. 276, Macromolecular Crystallography, Part A, edited by C. W. Carter Jr & R. M. Sweet, pp. 307-326. New York: Academic Press.]) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: OSCAIL (McArdle, 2003[McArdle, P. (2003). OSCAIL for Windows. Version 10. Crystallography Centre, Chemistry Department, NUI Galway, Ireland.]) and SHELXS97 (Sheldrick, 1997[Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany.]); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997[Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany.]); molecular graphics: PLATON (Spek, 2003[Spek, A. L. (2003). J. Appl. Cryst. 36, 7-13.]); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999[Ferguson, G. (1999). PRPKAPPA. University of Guelph, Canada.]).

Supporting information


Comment top

In this paper, we describe the structures of two compounds in the series 4-O2NC6H4CHN—(CH2)n—NCHC6H4NO2, where n = 4, compound (III), or n = 6, compound (IV) (see scheme). We have recently reported the molecular and supramolecular structures of N,N'-bis(4-nitrobenzylidene)ethane-1,2-diamine, (II), where n = 2 (Bomfim et al., 2005). The molecules of (II), which lie across centres of inversion in space group P21/n, are linked into sheets by a single C—H···O hydrogen bond, and these sheets are further linked by an aromatic ππ stacking interaction. By contrast, in (E,E)-1-(3-nitrophenyl)-4-(4-nitrophenyl)-2,3-diaza-1,3-butadiene, compound (I), where there are no methylene groups between the two –CHN– units, the centrosymmetric molecules are linked directly into a three-dimensional framework structure by means of two independent C—H···O hydrogen bonds (Glidewell et al., 2006). Intrigued by the differences in the aggregation patterns of these two compounds, we have now undertaken a more extended study involving compounds (III) and (IV), and report their structures here.

Compounds (I)–(IV) all lie across centres of inversion and all have the (E,E) configuration at the CN double bonds. In each of compounds (III) and (IV) (Figs. 1 and 2), the reference molecule was selected, for the sake of convenience, as that centred across (1/2, 1/2, 1/2), in space groups P1 and P21/c, respectively

In each of compounds (II)–(IV), the nitro groups are essentially co-planar with the adjacent aryl rings, as shown by the relevant torsion angles (Table 1) and, likewise, the C1—C11—N11—C12 fragments are effectively co-planar with these rings. However, the skeletons in the polymethylene spacer units adopt conformations which are very far from planar.

In compound (III) (Fig. 1), the molecules are linked into chains of edge-fused rings, which can alternatively be described as molecular ladders, by a single C—H···O hydrogen bond (Table 2), and these chains are further linked into a three-dimensional framework by two independent ππ stacking interactions. The methine atoms C11 at (x, y, z) and (1 - x, 1 - y, 1 - z) are parts of the molecule centred at (1/2, 1/2, 1/2). These atoms act as hydrogen-bond donors to the nitro atoms O42 at (x, y, 1 + z) and (1 - x, 1 - y, -z), respectively, which themselves are parts of the molecules centred at (1/2, 1/2, 3/2) and (1/2, 1/2, -1/2), respectively. Propagation by translation and inversion of this single hydrogen bond then generates a chain of edge-fused R22(30) rings (Bernstein et al., 1995) running along (1/2, 1/2, z) (Fig. 3).

The aryl rings at (x, y, z) and (-x, 1 - y, -z), which form parts of molecules centred at (1/2, 1/2, 1/2) and (-1/2, 1/2, -1/2), are strictly parallel, with an interplanar spacing of 3.738 (2) Å; the centroid separation is 3.377 (2) Å, corresponding to a ring offset of 1.602 (2) Å. Propagation by inversion of this stacking interaction then generates a chain running parallel to the [101] direction (Fig. 4). Similarly, the rings at (x, y, z) and (-x, 2 - y, -z) are parallel, with an interplanar spacing of 3.630 (2) °, and a centroid separation and offset of 3.378 (2) and 1.327 (2) Å, respectively. This stacking interaction generates a chain parallel to the [111] direction (Fig. 5). The combination of the [001], [101] and [111] chains suffices to link all of the molecules into a single three-dimensional structure.

In compound (IV) (Fig. 2), the molecules are linked by a single C—H···O hydrogen bond (Table 2), but aromatic ππ stacking interactions are absent from the structure. Instead, the hydrogen-bonded chains are linked, again into a three-dimensional structure, by a single dipolar nitro···nitro interaction. The aryl atoms C2 at (x, y, z) and (1 - x, 1 - y, 1 - z) act as hydrogen-bond donors to the nitro atoms O42 at (-1 + x, -1 + y, z) and (2 - x, 2 - y, 1 - z), which are themselves parts of the molecules centred at (-1/2, -1/2, 1/2) and (3/2, 3/2, 1/2), respectively. Propagation of this single hydrogen bond thus generates a chain of edge-fused R22(38) rings running parallel to the [110] direction (Fig. 6).

The nitro atom O41 at (x, y, z) forms a short dipolar contact with the nitro atom N4 at (3 - x, 1/2 + y, 3/2 - z); the dimensions of this contact are N···Oi 2.893 (2) Å, N—O···Ni 117.2 (2)° and O···Ni—Ci 118.4 (2)° [symmetry code: (i) 3 - x, 1/2 + y, 3/2 - z], so that it is somewhat reminiscent of the type I (perpendicular) dipolar carbonyl···carbonyl interaction (Allen et al., 1998). In this manner, the molecule centred at (1/2, 1/2, 1/2) acts as donor to the molecules centred at (5/2, 1, 1) and (-3/2, 0, 0) and as acceptor from those centred at (5/2, 0, 1) and (-3/2, 1, 0), so generating a (104) sheet in the form of a (4,4) net built from a single type of R44(46) ring (Starbuck et al., 1999) (Fig. 7). The combination of these sheets and the hydrogen-bonded [110] chains links all the molecules into a single three-dimensional framework.

Hence, although compounds (I)–(IV) all form three-dimensional supramolecular structures, no two exhibit the same range of direction-specific intermolecular interactions, and the details of the framework formation are different for each.

Experimental top

A solution of 4-nitrobenzaldehyde (8 mmol) and 1,4-diaminobutane (4 mmol) in methanol (25 ml) was heated under reflux for 30 min. After cooling, the solvent was removed under reduced pressure and the resulting solid product was recrystallized from methanol–1,2-dichloroethane (1:1 v/v) to yield crystals of compound (III) suitable for single-crystal X-ray diffraction (m.p. 438–439 K). Compound (IV) was prepared in a similar way from 4-nitrobenzaldehyde and 1,6-diaminohexane, but it was recrystallized from 1,2-dichloroethane (m.p. 408–410 K).

Refinement top

Crystals of compound (III) are triclinic. The space group P1 was selected and confirmed by the subsequent structure analysis. For compound (IV), the space group P21/c was uniquely determined from the systematic absences. All H atoms were located in difference maps and then treated as riding atoms, with C—H distances of 0.95 or 0.99 Å, and with Uiso(H) = 1.2Ueq(C).

Structure description top

In this paper, we describe the structures of two compounds in the series 4-O2NC6H4CHN—(CH2)n—NCHC6H4NO2, where n = 4, compound (III), or n = 6, compound (IV) (see scheme). We have recently reported the molecular and supramolecular structures of N,N'-bis(4-nitrobenzylidene)ethane-1,2-diamine, (II), where n = 2 (Bomfim et al., 2005). The molecules of (II), which lie across centres of inversion in space group P21/n, are linked into sheets by a single C—H···O hydrogen bond, and these sheets are further linked by an aromatic ππ stacking interaction. By contrast, in (E,E)-1-(3-nitrophenyl)-4-(4-nitrophenyl)-2,3-diaza-1,3-butadiene, compound (I), where there are no methylene groups between the two –CHN– units, the centrosymmetric molecules are linked directly into a three-dimensional framework structure by means of two independent C—H···O hydrogen bonds (Glidewell et al., 2006). Intrigued by the differences in the aggregation patterns of these two compounds, we have now undertaken a more extended study involving compounds (III) and (IV), and report their structures here.

Compounds (I)–(IV) all lie across centres of inversion and all have the (E,E) configuration at the CN double bonds. In each of compounds (III) and (IV) (Figs. 1 and 2), the reference molecule was selected, for the sake of convenience, as that centred across (1/2, 1/2, 1/2), in space groups P1 and P21/c, respectively

In each of compounds (II)–(IV), the nitro groups are essentially co-planar with the adjacent aryl rings, as shown by the relevant torsion angles (Table 1) and, likewise, the C1—C11—N11—C12 fragments are effectively co-planar with these rings. However, the skeletons in the polymethylene spacer units adopt conformations which are very far from planar.

In compound (III) (Fig. 1), the molecules are linked into chains of edge-fused rings, which can alternatively be described as molecular ladders, by a single C—H···O hydrogen bond (Table 2), and these chains are further linked into a three-dimensional framework by two independent ππ stacking interactions. The methine atoms C11 at (x, y, z) and (1 - x, 1 - y, 1 - z) are parts of the molecule centred at (1/2, 1/2, 1/2). These atoms act as hydrogen-bond donors to the nitro atoms O42 at (x, y, 1 + z) and (1 - x, 1 - y, -z), respectively, which themselves are parts of the molecules centred at (1/2, 1/2, 3/2) and (1/2, 1/2, -1/2), respectively. Propagation by translation and inversion of this single hydrogen bond then generates a chain of edge-fused R22(30) rings (Bernstein et al., 1995) running along (1/2, 1/2, z) (Fig. 3).

The aryl rings at (x, y, z) and (-x, 1 - y, -z), which form parts of molecules centred at (1/2, 1/2, 1/2) and (-1/2, 1/2, -1/2), are strictly parallel, with an interplanar spacing of 3.738 (2) Å; the centroid separation is 3.377 (2) Å, corresponding to a ring offset of 1.602 (2) Å. Propagation by inversion of this stacking interaction then generates a chain running parallel to the [101] direction (Fig. 4). Similarly, the rings at (x, y, z) and (-x, 2 - y, -z) are parallel, with an interplanar spacing of 3.630 (2) °, and a centroid separation and offset of 3.378 (2) and 1.327 (2) Å, respectively. This stacking interaction generates a chain parallel to the [111] direction (Fig. 5). The combination of the [001], [101] and [111] chains suffices to link all of the molecules into a single three-dimensional structure.

In compound (IV) (Fig. 2), the molecules are linked by a single C—H···O hydrogen bond (Table 2), but aromatic ππ stacking interactions are absent from the structure. Instead, the hydrogen-bonded chains are linked, again into a three-dimensional structure, by a single dipolar nitro···nitro interaction. The aryl atoms C2 at (x, y, z) and (1 - x, 1 - y, 1 - z) act as hydrogen-bond donors to the nitro atoms O42 at (-1 + x, -1 + y, z) and (2 - x, 2 - y, 1 - z), which are themselves parts of the molecules centred at (-1/2, -1/2, 1/2) and (3/2, 3/2, 1/2), respectively. Propagation of this single hydrogen bond thus generates a chain of edge-fused R22(38) rings running parallel to the [110] direction (Fig. 6).

The nitro atom O41 at (x, y, z) forms a short dipolar contact with the nitro atom N4 at (3 - x, 1/2 + y, 3/2 - z); the dimensions of this contact are N···Oi 2.893 (2) Å, N—O···Ni 117.2 (2)° and O···Ni—Ci 118.4 (2)° [symmetry code: (i) 3 - x, 1/2 + y, 3/2 - z], so that it is somewhat reminiscent of the type I (perpendicular) dipolar carbonyl···carbonyl interaction (Allen et al., 1998). In this manner, the molecule centred at (1/2, 1/2, 1/2) acts as donor to the molecules centred at (5/2, 1, 1) and (-3/2, 0, 0) and as acceptor from those centred at (5/2, 0, 1) and (-3/2, 1, 0), so generating a (104) sheet in the form of a (4,4) net built from a single type of R44(46) ring (Starbuck et al., 1999) (Fig. 7). The combination of these sheets and the hydrogen-bonded [110] chains links all the molecules into a single three-dimensional framework.

Hence, although compounds (I)–(IV) all form three-dimensional supramolecular structures, no two exhibit the same range of direction-specific intermolecular interactions, and the details of the framework formation are different for each.

Computing details top

For both compounds, data collection: COLLECT (Nonius, 1998); cell refinement: DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999).

Figures top
[Figure 1] Fig. 1. The molecule of compound (III), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. Atoms labelled with the suffix 'a' are at the symmetry position (1 - x, 1 - y, 1 - z).
[Figure 2] Fig. 2. The molecule of compound (IV), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. Atoms labelled with the suffix 'a' are at the symmetry position (1 - x, 1 - y, 1 - z).
[Figure 3] Fig. 3. A stereoview of part of the crystal structure of (III), showing the formation of a chain of edge-fused R22(30) rings along [001]. For the sake of clarity, H atoms not involved in the motif shown have been omitted.
[Figure 4] Fig. 4. A stereoview of part of the crystal structure of (III), showing the formation of a π-stacked chain along [101]. For the sake of clarity, all H atoms have been omitted.
[Figure 5] Fig. 5. A stereoview of part of the crystal structure of (III), showing the formation of a π-stacked chain along [111]. For the sake of clarity, all H atoms have been omitted.
[Figure 6] Fig. 6. Part of the crystal structure of (IV), showing the formation of a chain of edge-fused R22(38) rings along [001]. For the sake of clarity, H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*), hash (#), ampersand (&), dollar sign ($) or `at' symbol (@) are at the symmetry positions (1 - x, 1 - y, 1 - z), (-1 + x, -1 + y, z), (1 + x, 1 + y, z), (2 - x, 2 - y, 1 - z) and (-x, -y, 1 - z), respectively.
[Figure 7] Fig. 7. A stereoview of part of the crystal structure of (IV), showing the formation of a (104) sheet of R44(46) rings generated by the dipolar nitro···nitro interaction. For the sake of clarity, all H atoms have been omitted.
(III) (E,E)—N,N'-bis(4-nitrobenzylidene)butane-1,4-diamine top
Crystal data top
C18H18N4O4Z = 1
Mr = 354.36F(000) = 186
Triclinic, P1Dx = 1.414 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 7.1162 (4) ÅCell parameters from 1895 reflections
b = 7.1895 (2) Åθ = 3.1–27.6°
c = 9.1695 (4) ŵ = 0.10 mm1
α = 83.210 (3)°T = 120 K
β = 78.920 (2)°Lath, colourless
γ = 64.808 (3)°0.46 × 0.34 × 0.13 mm
V = 416.25 (3) Å3
Data collection top
Nonius KappaCCD area-detector
diffractometer
1895 independent reflections
Radiation source: Bruker Nonius FR591 rotating anode1589 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.028
Detector resolution: 9.091 pixels mm-1θmax = 27.6°, θmin = 3.1°
φ and ω scansh = 99
Absorption correction: multi-scan
(SADABS; Sheldrick, 2003)
k = 99
Tmin = 0.944, Tmax = 0.987l = 1111
8689 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.040Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.114H-atom parameters constrained
S = 1.05 w = 1/[σ2(Fo2) + (0.0652P)2 + 0.1082P]
where P = (Fo2 + 2Fc2)/3
1893 reflections(Δ/σ)max < 0.001
118 parametersΔρmax = 0.26 e Å3
0 restraintsΔρmin = 0.34 e Å3
Crystal data top
C18H18N4O4γ = 64.808 (3)°
Mr = 354.36V = 416.25 (3) Å3
Triclinic, P1Z = 1
a = 7.1162 (4) ÅMo Kα radiation
b = 7.1895 (2) ŵ = 0.10 mm1
c = 9.1695 (4) ÅT = 120 K
α = 83.210 (3)°0.46 × 0.34 × 0.13 mm
β = 78.920 (2)°
Data collection top
Nonius KappaCCD area-detector
diffractometer
1895 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2003)
1589 reflections with I > 2σ(I)
Tmin = 0.944, Tmax = 0.987Rint = 0.028
8689 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0400 restraints
wR(F2) = 0.114H-atom parameters constrained
S = 1.05Δρmax = 0.26 e Å3
1893 reflectionsΔρmin = 0.34 e Å3
118 parameters
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
C10.04942 (18)0.76874 (16)0.16560 (12)0.0166 (3)
C20.16018 (18)0.80111 (17)0.17853 (12)0.0180 (3)
C30.24425 (18)0.79419 (17)0.05569 (13)0.0182 (3)
C40.11310 (18)0.75422 (16)0.07985 (12)0.0164 (3)
C50.09695 (18)0.72065 (17)0.09719 (12)0.0178 (3)
C60.17834 (18)0.72778 (17)0.02671 (13)0.0175 (3)
N40.20026 (16)0.74590 (15)0.21094 (11)0.0187 (2)
O410.38677 (14)0.77768 (14)0.19416 (10)0.0272 (2)
O420.08302 (14)0.70788 (14)0.33088 (9)0.0270 (2)
C110.12746 (18)0.78186 (17)0.30044 (12)0.0176 (3)
N110.30768 (16)0.77813 (15)0.29785 (11)0.0190 (2)
C120.36181 (19)0.79103 (18)0.44148 (12)0.0195 (3)
C130.53546 (19)0.58793 (17)0.48542 (12)0.0188 (3)
H20.24720.82840.27300.022*
H30.38730.81620.06450.022*
H50.18300.69340.19200.021*
H60.32170.70480.01740.021*
H110.03820.79370.39360.021*
H12A0.23540.82450.51870.023*
H12B0.40960.90290.43530.023*
H13A0.65810.55080.40480.023*
H13B0.58080.60640.57620.023*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.0197 (6)0.0126 (5)0.0176 (5)0.0072 (4)0.0032 (4)0.0016 (4)
C20.0188 (6)0.0181 (6)0.0164 (5)0.0086 (5)0.0008 (4)0.0005 (4)
C30.0160 (6)0.0171 (5)0.0218 (6)0.0079 (4)0.0023 (4)0.0005 (4)
C40.0196 (6)0.0132 (5)0.0170 (5)0.0067 (4)0.0050 (4)0.0010 (4)
C50.0185 (6)0.0164 (5)0.0160 (5)0.0065 (5)0.0010 (4)0.0007 (4)
C60.0154 (6)0.0161 (6)0.0206 (6)0.0063 (4)0.0025 (4)0.0003 (4)
N40.0209 (5)0.0157 (5)0.0192 (5)0.0071 (4)0.0039 (4)0.0003 (4)
O410.0204 (5)0.0349 (5)0.0287 (5)0.0114 (4)0.0072 (4)0.0046 (4)
O420.0280 (5)0.0335 (5)0.0177 (4)0.0112 (4)0.0020 (4)0.0032 (4)
C110.0198 (6)0.0146 (5)0.0163 (5)0.0062 (4)0.0011 (4)0.0005 (4)
N110.0201 (5)0.0192 (5)0.0180 (5)0.0081 (4)0.0051 (4)0.0019 (4)
C120.0213 (6)0.0209 (6)0.0176 (6)0.0095 (5)0.0037 (4)0.0009 (4)
C130.0194 (6)0.0209 (6)0.0178 (5)0.0094 (5)0.0048 (4)0.0002 (4)
Geometric parameters (Å, º) top
C1—C21.3914 (16)N4—O421.2266 (13)
C1—C61.4000 (16)N4—O411.2285 (13)
C1—C111.4771 (16)C11—N111.2670 (16)
C2—C31.3880 (16)C11—H110.95
C2—H20.95N11—C121.4649 (14)
C3—C41.3815 (16)C12—C131.5289 (16)
C3—H30.95C12—H12A0.99
C4—C51.3887 (16)C12—H12B0.99
C4—N41.4725 (14)C13—C13i1.528 (2)
C5—C61.3859 (16)C13—H13A0.99
C5—H50.95C13—H13B0.99
C6—H60.95
C2—C1—C6119.64 (10)O42—N4—C4118.32 (10)
C2—C1—C11118.19 (10)O41—N4—C4118.13 (9)
C6—C1—C11122.17 (11)N11—C11—C1123.15 (10)
C3—C2—C1121.08 (10)N11—C11—H11118.4
C3—C2—H2119.5C1—C11—H11118.4
C1—C2—H2119.5C11—N11—C12116.39 (10)
C4—C3—C2117.85 (11)N11—C12—C13110.93 (9)
C4—C3—H3121.1N11—C12—H12A109.5
C2—C3—H3121.1C13—C12—H12A109.5
C3—C4—C5122.77 (10)N11—C12—H12B109.5
C3—C4—N4118.37 (10)C13—C12—H12B109.5
C5—C4—N4118.86 (10)H12A—C12—H12B108.0
C6—C5—C4118.60 (10)C13i—C13—C12112.57 (12)
C6—C5—H5120.7C13i—C13—H13A109.1
C4—C5—H5120.7C12—C13—H13A109.1
C5—C6—C1120.06 (11)C13i—C13—H13B109.1
C5—C6—H6120.0C12—C13—H13B109.1
C1—C6—H6120.0H13A—C13—H13B107.8
O42—N4—O41123.55 (10)
C6—C1—C2—C30.22 (17)C3—C4—N4—O42179.11 (10)
C11—C1—C2—C3178.97 (10)C5—C4—N4—O420.55 (15)
C1—C2—C3—C40.03 (16)C3—C4—N4—O410.96 (15)
C2—C3—C4—C50.18 (17)C5—C4—N4—O41179.38 (10)
C2—C3—C4—N4179.83 (9)C2—C1—C11—N11171.77 (10)
C3—C4—C5—C60.08 (17)C6—C1—C11—N117.40 (17)
N4—C4—C5—C6179.72 (9)C1—C11—N11—C12179.54 (9)
C4—C5—C6—C10.19 (16)C11—N11—C12—C13111.42 (11)
C2—C1—C6—C50.33 (16)N11—C12—C13—C13i65.67 (15)
C11—C1—C6—C5178.83 (10)
Symmetry code: (i) x+1, y+1, z+1.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C11—H11···O42ii0.952.603.502 (2)159
Symmetry code: (ii) x, y, z+1.
(IV) (E,E)—N,N'-bis(4-nitrobenzylidene)hexane-1,6-diamine top
Crystal data top
C20H22N4O4F(000) = 404
Mr = 382.42Dx = 1.373 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 2083 reflections
a = 6.1908 (3) Åθ = 3.3–27.6°
b = 4.9761 (2) ŵ = 0.10 mm1
c = 30.1095 (15) ÅT = 120 K
β = 94.331 (3)°Lath, colourless
V = 924.91 (7) Å30.44 × 0.30 × 0.12 mm
Z = 2
Data collection top
Nonius KappaCCD area-detector
diffractometer
2083 independent reflections
Radiation source: Bruker Nonius FR591 rotating anode1516 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.041
Detector resolution: 9.091 pixels mm-1θmax = 27.6°, θmin = 3.3°
φ and ω scansh = 87
Absorption correction: multi-scan
(SADABS; Sheldrick, 2003)
k = 66
Tmin = 0.952, Tmax = 0.988l = 3139
7409 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.045Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.113H-atom parameters constrained
S = 1.06 w = 1/[σ2(Fo2) + (0.0532P)2 + 0.2054P]
where P = (Fo2 + 2Fc2)/3
2083 reflections(Δ/σ)max = 0.001
127 parametersΔρmax = 0.19 e Å3
0 restraintsΔρmin = 0.30 e Å3
Crystal data top
C20H22N4O4V = 924.91 (7) Å3
Mr = 382.42Z = 2
Monoclinic, P21/cMo Kα radiation
a = 6.1908 (3) ŵ = 0.10 mm1
b = 4.9761 (2) ÅT = 120 K
c = 30.1095 (15) Å0.44 × 0.30 × 0.12 mm
β = 94.331 (3)°
Data collection top
Nonius KappaCCD area-detector
diffractometer
2083 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2003)
1516 reflections with I > 2σ(I)
Tmin = 0.952, Tmax = 0.988Rint = 0.041
7409 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0450 restraints
wR(F2) = 0.113H-atom parameters constrained
S = 1.06Δρmax = 0.19 e Å3
2083 reflectionsΔρmin = 0.30 e Å3
127 parameters
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
C11.0614 (2)0.6700 (3)0.63857 (5)0.0180 (3)
C20.9798 (2)0.7860 (3)0.67597 (5)0.0195 (3)
C31.0927 (2)0.9893 (3)0.69923 (5)0.0195 (3)
C41.2888 (2)1.0703 (3)0.68471 (5)0.0172 (3)
C51.3742 (2)0.9581 (3)0.64772 (5)0.0216 (4)
C61.2599 (2)0.7585 (3)0.62471 (5)0.0214 (4)
N41.41049 (19)1.2853 (3)0.70893 (4)0.0190 (3)
O411.32987 (17)1.3916 (2)0.74050 (3)0.0251 (3)
O421.58791 (17)1.3487 (2)0.69620 (3)0.0266 (3)
C110.9388 (2)0.4543 (3)0.61428 (5)0.0192 (3)
N110.99326 (19)0.3625 (3)0.57753 (4)0.0212 (3)
C120.8611 (2)0.1507 (3)0.55614 (5)0.0217 (4)
C130.7409 (2)0.2517 (3)0.51322 (5)0.0203 (4)
C140.5605 (2)0.4499 (3)0.52148 (5)0.0209 (4)
H20.84560.72550.68560.023*
H31.03651.07050.72450.023*
H51.50931.01800.63840.026*
H61.31620.68030.59920.026*
H110.81470.38190.62670.023*
H12A0.75500.08670.57680.026*
H12B0.95470.00280.54930.026*
H13A0.84570.33980.49470.024*
H13B0.67800.09610.49630.024*
H14A0.62340.60580.53830.025*
H14B0.45600.36200.54010.025*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.0193 (7)0.0185 (8)0.0158 (7)0.0004 (6)0.0016 (6)0.0025 (6)
C20.0183 (7)0.0213 (8)0.0191 (7)0.0021 (6)0.0023 (6)0.0010 (6)
C30.0208 (8)0.0208 (8)0.0171 (7)0.0006 (7)0.0035 (6)0.0006 (6)
C40.0187 (7)0.0161 (8)0.0163 (7)0.0009 (6)0.0024 (6)0.0016 (6)
C50.0175 (7)0.0271 (9)0.0204 (7)0.0032 (7)0.0029 (6)0.0013 (7)
C60.0221 (8)0.0242 (8)0.0183 (7)0.0008 (7)0.0046 (6)0.0022 (6)
N40.0197 (6)0.0176 (7)0.0193 (6)0.0005 (5)0.0001 (5)0.0025 (5)
O410.0270 (6)0.0239 (6)0.0245 (6)0.0008 (5)0.0031 (5)0.0064 (5)
O420.0227 (6)0.0299 (7)0.0276 (6)0.0100 (5)0.0043 (5)0.0002 (5)
C110.0197 (7)0.0186 (8)0.0193 (7)0.0018 (6)0.0010 (6)0.0021 (6)
N110.0217 (7)0.0225 (7)0.0191 (6)0.0023 (6)0.0012 (5)0.0026 (6)
C120.0238 (8)0.0194 (8)0.0222 (8)0.0005 (7)0.0027 (6)0.0034 (7)
C130.0213 (8)0.0213 (8)0.0185 (7)0.0038 (7)0.0023 (6)0.0041 (6)
C140.0226 (8)0.0217 (9)0.0184 (7)0.0036 (6)0.0020 (6)0.0033 (6)
Geometric parameters (Å, º) top
C1—C21.394 (2)N4—O421.2315 (15)
C1—C61.398 (2)C11—N111.2663 (18)
C1—C111.476 (2)C11—H110.95
C2—C31.389 (2)N11—C121.4546 (19)
C2—H20.95C12—C131.527 (2)
C3—C41.381 (2)C12—H12A0.99
C3—H30.95C12—H12B0.99
C4—C51.386 (2)C13—C141.524 (2)
C4—N41.4698 (19)C13—H13A0.99
C5—C61.376 (2)C13—H13B0.99
C5—H50.95C14—C14i1.528 (3)
C6—H60.95C14—H14A0.99
N4—O411.2265 (15)C14—H14B0.99
C2—C1—C6119.38 (14)N11—C11—H11118.8
C2—C1—C11119.83 (13)C1—C11—H11118.8
C6—C1—C11120.79 (13)C11—N11—C12118.07 (13)
C3—C2—C1120.68 (14)N11—C12—C13110.98 (13)
C3—C2—H2119.7N11—C12—H12A109.4
C1—C2—H2119.7C13—C12—H12A109.4
C4—C3—C2118.28 (13)N11—C12—H12B109.4
C4—C3—H3120.9C13—C12—H12B109.4
C2—C3—H3120.9H12A—C12—H12B108.0
C3—C4—C5122.31 (14)C14—C13—C12113.04 (12)
C3—C4—N4119.02 (13)C14—C13—H13A109.0
C5—C4—N4118.66 (13)C12—C13—H13A109.0
C6—C5—C4118.85 (14)C14—C13—H13B109.0
C6—C5—H5120.6C12—C13—H13B109.0
C4—C5—H5120.6H13A—C13—H13B107.8
C5—C6—C1120.49 (14)C13—C14—C14i113.03 (15)
C5—C6—H6119.8C13—C14—H14A109.0
C1—C6—H6119.8C14i—C14—H14A109.0
O41—N4—O42123.74 (13)C13—C14—H14B109.0
O41—N4—C4118.37 (12)C14i—C14—H14B109.0
O42—N4—C4117.89 (12)H14A—C14—H14B107.8
N11—C11—C1122.31 (14)
C6—C1—C2—C30.5 (2)C3—C4—N4—O412.3 (2)
C11—C1—C2—C3179.95 (13)C5—C4—N4—O41176.99 (13)
C1—C2—C3—C40.9 (2)C3—C4—N4—O42177.87 (13)
C2—C3—C4—C50.7 (2)C5—C4—N4—O422.8 (2)
C2—C3—C4—N4179.98 (13)C2—C1—C11—N11172.20 (15)
C3—C4—C5—C60.1 (2)C6—C1—C11—N118.3 (2)
N4—C4—C5—C6179.41 (13)C1—C11—N11—C12179.72 (12)
C4—C5—C6—C10.3 (2)C11—N11—C12—C13111.90 (15)
C2—C1—C6—C50.1 (2)N11—C12—C13—C1470.53 (15)
C11—C1—C6—C5179.45 (14)C12—C13—C14—C14i179.76 (15)
Symmetry code: (i) x+1, y+1, z+1.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C2—H2···O42ii0.952.503.3491 (18)149
Symmetry code: (ii) x1, y1, z.

Experimental details

(III)(IV)
Crystal data
Chemical formulaC18H18N4O4C20H22N4O4
Mr354.36382.42
Crystal system, space groupTriclinic, P1Monoclinic, P21/c
Temperature (K)120120
a, b, c (Å)7.1162 (4), 7.1895 (2), 9.1695 (4)6.1908 (3), 4.9761 (2), 30.1095 (15)
α, β, γ (°)83.210 (3), 78.920 (2), 64.808 (3)90, 94.331 (3), 90
V3)416.25 (3)924.91 (7)
Z12
Radiation typeMo KαMo Kα
µ (mm1)0.100.10
Crystal size (mm)0.46 × 0.34 × 0.130.44 × 0.30 × 0.12
Data collection
DiffractometerNonius KappaCCD area-detectorNonius KappaCCD area-detector
Absorption correctionMulti-scan
(SADABS; Sheldrick, 2003)
Multi-scan
(SADABS; Sheldrick, 2003)
Tmin, Tmax0.944, 0.9870.952, 0.988
No. of measured, independent and
observed [I > 2σ(I)] reflections
8689, 1895, 1589 7409, 2083, 1516
Rint0.0280.041
(sin θ/λ)max1)0.6510.651
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.040, 0.114, 1.05 0.045, 0.113, 1.06
No. of reflections18932083
No. of parameters118127
H-atom treatmentH-atom parameters constrainedH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.26, 0.340.19, 0.30

Computer programs: COLLECT (Nonius, 1998), DENZO (Otwinowski & Minor, 1997) and COLLECT, DENZO and COLLECT, OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997), OSCAIL and SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003), SHELXL97 and PRPKAPPA (Ferguson, 1999).

Selected torsion angles (°) for compounds (II)–(IV) top
Parameter(II)(III)(IV)
C3-C4-N4-O41-5.86 (15)0.96 (15)-2.3 (2)
C2-C1-C11-N11177.91 (9)-171.77 (10)172.20 (15)
C1-C11-N11-C12-176.58 (8)-179.54 (9)-179.72 (12)
C11-N11-C12-C12i118.31 (13)
C11-N11-C12-C13111.42 (11)111.90 (15)
N11-C12-C13-C13i-65.67 (15)
N11-C12-C13-C14-70.53 (15)
C12-C13-C14-C14i-179.76 (15)
Symmetry code: (i) 1 - x, 1 - y, 1 - z. Data for compound (II) from Bomfim et al. (2005).
Hydrogen-bond geometry (Å, °) for compounds (III) and (IV) top
CompoundD-H···AD-HH···AD···AD-H···A
(III)C11-H11···O42i0.952.603.502 (2)159
(IV)C2-H2···O42ii0.952.503.349 (2)149
Symmetry codes: (i) x, y, 1 + z; (ii) -1 + x, -1 + y, z.
 

Acknowledgements

The X-ray data were collected at the EPSRC X-ray Crystallographic Service, University of Southampton; the authors thank the staff for all their help and advice. JLW thanks CNPq and FAPERJ for financial support.

References

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