Crystal structure of bis­(tri­ethano­lamine-κ3N,O,O′)nickel(II) bis­(3-hy­droxy­benzoate) tetra­hydrate

Ibragimov, A.B.

doi:10.1107/S2056989016005521

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ISSN: 2056-9890

Volume 72| Part 5| May 2016| Pages 643-647

doi:10.1107/S2056989016005521

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Crystal structure of bis(triethanolamine-κ³N,O,O′)nickel(II) bis(3-hydroxybenzoate) tetrahydrate

Aziz B. Ibragimov ^a ^*

^aInstitute of General and Inorganic Chemistry of Uzbekistan Academy of Sciences, M.Ulugbek Str, 77a, Tashkent 100170, Uzbekistan
^*Correspondence e-mail: aziz_ibragimov@mail.ru

Edited by M. Weil, Vienna University of Technology, Austria (Received 14 March 2016; accepted 2 April 2016; online 8 April 2016)

The reaction of 3-hydroxybenzoic (m-hydroxybenzoic) acid (MHBA), triethanolamine (TEA) and Ni(NO₃)₂ in aqueous solution led to formation of the hydrated title salt, [Ni(C₆H₁₅NO₃)₂](C₇H₅O₃)·4H₂O. In the complex cation, the Ni²⁺ ion is located on an inversion centre. Two symmetry-related TEA ligands occupy all coordination sites in an N,O,O′-tridentate coordination, leading to a slightly distorted NiN₂O₄ octahedron. Two ethanol groups of each TEA ligand form two five-membered chelate rings around Ni²⁺, while the third ethanol group does not coordinate to the metal atom. Two MHBA⁻ anions in the benzoate form are situated in the outer coordination sphere for charge compensation. An intricate network of hydrogen bonds between the free and coordinating hydroxy groups of the TEA ligands, the O atoms of the MHBA⁻ anions and the water molecules leads to the formation of a two-dimensional structure extending parallel to (010).

Keywords: crystal structure; 3-hydroxybenzoic acid; triethanolamine; hydrogen bonding.

CCDC reference: 1471925

1. Chemical context

Triethanolamine (TEA) is a substance with relatively low antimicrobial (Zardini et al., 2014 ) and plant-growth-stimulating (Loginov et al., 2012 ) activities. However, it is a well-known compound owing to technical applications as a curing agent for epoxy and rubber polymers, adhesives and antistatic agents, and as a corrosion inhibitor in metal-cutting (Ashton Acton, 2013 ). The interaction of metal ions with TEA can result in the formation of complexes in which it demonstrates monodentate (Kumar et al., 2014 ), bidentate (Long et al., 2004 ), tridentate (Mirskova et al., 2013 ; Haukka et al., 2005 ) or tetradentate (Zaitsev et al., 2014 ; Langley et al., 2011 ) binding modes. TEA ligands are also able to interact as bridging ligands between two metal cations (Sharma et al., 2014 ) or as bridging ligands to form one-dimensional polymeric structures (Custelcean & Jackson, 1998 ). Moreover, there are metal complexes in which TEA molecules are non-coordinating and are consequently situated outside the actual coordination spheres (Ilyukhin et al., 2013 ; Manos et al., 2012 ).

In contrast to the other two biologically active isomers of hydroxybenzoic acid, namely o-hydroxybenzoic (salicylic) and p-hydroxybenzoic (paraben) acid, m-hydroxybenzoic acid (MHBA) has no specific biological action. Nevertheless, MHBA is a component of castoreum, the exudate from the castor sacs of the mature North American beaver, used in perfumery and folk medicine (Müller-Schwarze & Houlihan, 1991 ). Most metal complexes of MHBA are in their mixed-ligand form in which mono- (Ma et al., 2013 ; Köse et al., 2012 ) or bidentate (Thompson et al., 2015 ; Zaman et al., 2012 ) coordination through the carboxylic oxygen atoms take place. The latter coordination mode may give rise to the generation of polymeric metal complexes (Koizumi et al., 1984 ; Koziol et al., 1990 ). There are also structures in which MHBA molecules are non-coordinating (Zaman et al., 2013 ) or simultaneously coordinating and non-coordinating (Li et al., 2008 ).

To the best of our knowledge, metal complexes on the basis of MHBA and ethanolamines have not yet been obtained and structurally characterized. Here, the synthesis and structure of [Ni(C₆H₁₅NO₃)₂](C₇H₅O₃)₂·4H₂O is reported.

2. Structural commentary

The asymmetric unit of the title compound contains one half of the complex nickel(II) cation (the other part being completed by inversion symmetry), one MHBA⁻ counter-anion and two water molecules (Fig. 1). Two symmetry-related TEA ligand molecules coordinate in a N,O,O′-tridentate binding mode to the metal cation, giving rise to a slightly distorted octahedral NiN₂O₄ coordination environment. One hydroxyl group of each ethanol substituent is not involved in the coordination and is directed away from the coordination centre. As a result of symmetry requirements, the nitrogen atoms are in trans-positions of the coordination polyhedron, giving rise to a linear N—Ni—N angle. The Ni—N bond length is 2.1158 (13) Å, and the Ni—O4 and Ni—O5 bond lengths are 2.0734 (11) and 2.0636 (12) Å, respectively. The N—Ni—O angles range from 82.22 (5) to 97.78 (5)° and the O—Ni—O angles from 89.94 (5) to 90.06 (5)°. Since the TEA ligands coordinate in their neutral form, charge compensation is required by two MHBA⁻ anions. They are in their benzoate form and are located in the outer coordination sphere, with the carboxylate group tilted by 14.1 (2)° relative to the aromatic ring. The water molecules are also non-coordinating.

Figure 1
The molecular entities in the title structure, with displacement ellipsoids drawn at the 50% probability level. The parts of the asymmetric unit are identified by labelled atoms; all other atoms are generated by the symmetry operation (−x + 1, −y, −z + 1).

3. Supramolecular features

The supramolecular structure features an intricate network of intermolecular O—H⋯O hydrogen bonds (Table 1), including four cyclic motifs of different sizes. The MHBA⁻ anion is connected to the complex cation by a pair of rather strong hydrogen bonds [D⋯A = 2.579 (2) and 2.638 (2) Å, respectively] within a R₂²(8) motif (Etter, 1990 ) (Fig. 2). This `cation–anion' hydrogen-bonded unit is further associated to the other moieties through formation of an 11-membered ring between the non-coordinating hydroxyl group O6 and water molecule O2W. Three additional hydrogen bonds, O2W⋯O1, O3⋯O1W and O2W⋯O1W, lead to the same R₃³(11) graph-set motif, in each case with hydrogen bonds of medium strength (Table 1). The fourth cyclic motif has graph-set notation R₆⁶(12) and consists of a centrosymmetric 12-membered cycle between two unique water molecules and the non-coordinating hydroxyl group O6 (Fig. 3). Together, the above-mentioned hydrogen-bonding interactions give rise to a two-dimensional supramolecular structure extending parallel to (010).

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1W—H1WA⋯O2ⁱ	0.83 (3)	1.89 (3)	2.711 (2)	168 (3)
O1W—H1WB⋯O6ⁱⁱ	1.06 (5)	1.63 (3)	2.674 (2)	168 (4)
O2W—H2WA⋯O1ⁱⁱⁱ	0.85	1.95	2.775 (2)	165
O2W—H2WB⋯O1Wⁱⁱⁱ	0.85	2.07	2.830 (2)	149
O3—H3⋯O1W	0.82	1.96	2.775 (2)	177
O4—H4⋯O1ⁱⁱⁱ	0.87 (2)	1.72 (2)	2.579 (2)	169 (2)
O5—H5⋯O2ⁱⁱⁱ	0.74 (3)	1.90 (3)	2.638 (2)	175 (3)
O6—H6⋯O2Wⁱⁱⁱ	0.82	1.93	2.728 (3)	165
Symmetry codes: (i) x-1, y, z; (ii) -x, -y, -z+2; (iii) -x+1, -y, -z+1.

Figure 2
Different ring motifs generated by hydrogen bonds (shown as dashed lines). Symmetry codes refer to Table 1

Figure 3
The packing of the molecular entities in the crystal structure (shown as dashed lines). For clarity, H atoms have been omitted.

4. Database survey

A survey of the Cambridge Structural Database (CSD) (Groom & Allen, 2014 ) showed that coordination complexes of TEA or MHBA with many metals including those of the s-, d-, p-, and f-block elements have been documented. 50 entries correspond to structures in which TEA molecules are ligating, including 21 examples in a tetradentate mode (e.g. AKEXET, GEGTIV, IBOCOR, JOMDAS, LAKYAX, RUQSUR, SUTZIQ) and two polymeric structures (GOCVEZ, CUMSAE, CUMSAE01). The combination of tri- and tetradentate coordination modes is observed in five cases (MEVQIN, MEVQOT, EYIPAD, LAKYAX, MUCBIV). There is only one structure with TEA in a monodentate mode (KISMUW) and one with a bidentate mode (QAJDIP). The most frequently encountered tridentate coordination mode is also observed in the title compound and reported for 22 entries (e.g. ASUGEA, CABTEF, DAYPOJ, FOVKIL, ETOLNI, GUQXEV, IGALOR).

There are 40 entries for MHBA coordination complexes in the CSD. For 14 entries, the MHBA molecules occupy a coordination sphere in the form of mixed-ligand complexes in monodentate coordination (e.g. GIMLEU, MEZFIG, NESFOH, SEZJOX), while bidentate coordination (e.g. MIQYIV, SISTAQ, WINFIJ, YIQQIZ) is found in twelve cases and a combination of the two modes only for entries CIVGOF and KIDBEE. Polymeric metal complex formation is reported for seven structures (CIWPIH, COSLAX, COSLIF, KIDBOO, COSKUQ, COSLEB, KIDBII). It should be noted that the hydroxyl group of the MHBA molecule is involved in coordination neither in discrete nor in polymeric complexes. For five entries, MHBA molecules are situated in the outer spheres (GANZAY, LAMMOD, MEWBOH, NIWJAF and WEJNIJ), as is the case in the title compound.

5. Synthesis and crystallization

To an aqueous solution (2.5 ml) of Ni(NO₃)₂ (0.091 g, 0.5 mmol) was slowly added an ethanol solution (5 ml) containing TEA (132 µl) and MHBA (0.138 g, 1 mmol) under constant stirring. A light-green crystalline product was obtained at room temperature by solvent evaporation after 25 days.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. C-bound hydrogen atoms were placed in calculated positions and refined in the riding-model approximation, with C—H = 0.93 and 0.97 Å for aromatic and methylene hydrogen atoms, respectively, and with U_iso(H) = 1.2U_eq(C). O-bound hydrogen atoms were found from difference maps. Those attached to water molecule O1W and to hydroxy O atoms O4 and O5 were refined freely whereas those attached to water molecule O2W and hydroxy atoms O3 and O6 were refined with constrained O—H distances of 0.85 and 0.82 Å, respectively. For all O-bound hydrogen atoms, U_iso(H) = 1.5U_eq(O).

Table 2
Experimental details

Crystal data
Chemical formula	[Ni(C₆H₁₅NO₃)₂](C₇H₅O₃)₂·4H₂O
M_r	703.37
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	293
a, b, c (Å)	8.40515 (12), 21.4397 (3), 9.48944 (14)
β (°)	106.1835 (15)
V (Å³)	1642.27 (4)
Z	2
Radiation type	Cu Kα
μ (mm⁻¹)	1.50
Crystal size (mm)	0.32 × 0.14 × 0.12

Data collection
Diffractometer	Agilent Xcalibur Ruby
Absorption correction	Multi-scan (CrysAlis PRO; Agilent, 2014 )
T_min, T_max	0.912, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	12555, 3399, 3066
R_int	0.030
(sin θ/λ)_max (Å⁻¹)	0.629

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.038, 0.115, 1.03
No. of reflections	3399
No. of parameters	226
No. of restraints	3
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.26, −0.44
Computer programs: CrysAlis PRO (Agilent, 2014), OLEX2 (Dolomanov et al., 2009 ) and SHELXL2014 (Sheldrick, 2015 ).

Supporting information

CCDC reference: 1471925

Crystal structure: contains datablock I. DOI: 10.1107/S2056989016005521/wm5282sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S2056989016005521/wm5282Isup2.hkl

checkCIF report

Chemical context top

Triethanolamine (TEA) is a substance with relatively low antimicrobial (Zardini et al., 2014) and plant-growth-stimulating (Loginov et al., 2012) activities. However, it is a well-known compound owing to technical applications as a curing agent for epoxy and rubber polymers, adhesives and antistatic agents, and as a corrosion inhibitor in metal-cutting (Ashton Acton, 2013). The interaction of metal ions with TEA can result in the formation of complexes in which it demonstrates monodentate (Kumar et al., 2014), bidentate (Long et al., 2004), tridentate (Mirskova et al., 2013; Haukka et al., 2005) or tetradentate (Zaitsev et al., 2014; Langley et al., 2011) binding modes. TEA ligands are also able to interact as bridging ligands between two metal cations (Sharma et al., 2014) or as bridging ligands to form one-dimensional polymeric structures (Custelcean & Jackson, 1998). Moreover, there are metal complexes in which TEA molecules are non-coordinating and are consequently situated outside the actual coordination spheres (Ilyukhin et al., 2013; Manos et al., 2012).

In contrast to the other two biologically active isomers of hydroxybenzoic acid, namely o-hydroxybenzoic (salicylic) and p-hydroxybenzoic (paraben) acid, m-hydroxybenzoic acid (MHBA) has no specific biological action. Nevertheless, MHBA is a component of castoreum, the exudate from the castor sacs of the mature North American beaver, used in perfumery and folk medicine (Müller-Schwarze & Houlihan, 1991). Most metal complexes of MHBA are in their mixed-ligand form in which mono- (Ma et al., 2013; Köse et al., 2012) or bidentate (Thompson et al., 2015; Zaman et al., 2012) coordination through the carboxylic oxygen atoms take place. The latter coordination mode may give rise to the generation of polymeric metal complexes (Koizumi et al., 1984; Koziol et al., 1990). There are also structures in which MHBA molecules are non-coordinating (Zaman et al., 2013) or simultaneously coordinating and non-coordinating (Li et al., 2008).

Structural commentary top

The asymmetric unit of the title compound contains one half of the complex nickel(II) cation (the other part being completed by inversion symmetry), one MHBA^- counter-anion and two water molecules (Fig. 1). Two symmetry-related TEA ligand molecules coordinate in a N,O,O'-tridentate binding mode to the metal cation, giving rise to a slightly distorted octahedral NiN₂O₄ coordination environment. One hydroxyl group of each ethanol substituent is not involved in the coordination and is directed away from the coordination centre. As a result of symmetry requirements, the nitrogen atoms are in trans-positions of the coordination polyhedron, giving rise to a linear N—Ni—N angle. The Ni—N bond length is 2.1158 (13) Å, and the Ni—O4 and Ni—O5 bond lengths are 2.0734 (11) and 2.0636 (12) Å, respectively. The N—Ni—O angles range from 82.22 (5) to 97.78 (5)° and the O—Ni—O angles from 89.94 (5) to 90.06 (5)°. Since the TEA ligands coordinate in their neutral form, charge compensation is required by two MHBA^- anions. They are in their benzoate form and are located in the outer coordination sphere, with the carboxylate group tilted by 14.1 (2)° relative to the aromatic ring. The water molecules are also non-coordinating.

Supramolecular features top

The supramolecular structure features an intricate network of intermolecular O—H···O hydrogen bonds (Table 1), including four cyclic motifs of different sizes. The MHBA^- anion is connected to the complex cation by a pair of rather strong hydrogen bonds [D···A = 2.579 (2) and 2.638 (2) Å, respectively] within a R₂²(8) motif (Etter, 1990) (Fig. 2). This `cation–anion' hydrogen-bonded unit is further associated to the other moieties through formation of an 11-membered ring between the non-coordinating hydroxyl group O6 and water molecule O2W. Three additional hydrogen bonds, O2W···O1, O3···O1W and O2W···O1, lead to the same R³₃(11) graph-set motif, in each case with hydrogen bonds of medium strength (Table 1). The fourth cyclic motif has graph-set notation R₆⁶(12) and consists of a centrosymmetric 12-membered cycle between two unique water molecules and the non-coordinating hydroxyl group O6 (Fig. 3). Together, the above-mentioned hydrogen-bonding interactions give rise to a two-dimensional supramolecular structure extending parallel to (010).

Database survey top

A survey of the Cambridge Structural Database (CSD) (Groom & Allen, 2014) showed that coordination complexes of TEA or MHBA with many metals including those of the s-, d-, p-, and f-block elements have been documented. 50 entries correspond to structures in which TEA molecules are ligating, including 21 examples in a tetradentate mode (e.g. AKEXET, GEGTIV, IBOCOR, JOMDAS, LAKYAX, RUQSUR, SUTZIQ) and two polymeric structures (GOCVEZ, CUMSAE, CUMSAE01). The combination of tri- and tetradentate coordination modes is observed in five cases (MEVQIN, MEVQOT, EYIPAD, LAKYAX, MUCBIV). There is only one structure with TEA in a monodentate mode (KISMUW) and one with a bidentate mode (QAJDIP). The most frequently encountered tridentate coordination mode is also observed in the title compound and reported for 22 entries (e.g. ASUGEA, CABTEF, DAYPOJ, FOVKIL, ETOLNI, GUQXEV, IGALOR).

Synthesis and crystallization top

Refinement top

Structure description top

Triethanolamine (TEA) is a substance with relatively low antimicrobial (Zardini et al., 2014) and plant-growth-stimulating (Loginov et al., 2012) activities. However, it is a well-known compound owing to technical applications as a curing agent for epoxy and rubber polymers, adhesives and antistatic agents, and as a corrosion inhibitor in metal-cutting (Ashton Acton, 2013). The interaction of metal ions with TEA can result in the formation of complexes in which it demonstrates monodentate (Kumar et al., 2014), bidentate (Long et al., 2004), tridentate (Mirskova et al., 2013; Haukka et al., 2005) or tetradentate (Zaitsev et al., 2014; Langley et al., 2011) binding modes. TEA ligands are also able to interact as bridging ligands between two metal cations (Sharma et al., 2014) or as bridging ligands to form one-dimensional polymeric structures (Custelcean & Jackson, 1998). Moreover, there are metal complexes in which TEA molecules are non-coordinating and are consequently situated outside the actual coordination spheres (Ilyukhin et al., 2013; Manos et al., 2012).

In contrast to the other two biologically active isomers of hydroxybenzoic acid, namely o-hydroxybenzoic (salicylic) and p-hydroxybenzoic (paraben) acid, m-hydroxybenzoic acid (MHBA) has no specific biological action. Nevertheless, MHBA is a component of castoreum, the exudate from the castor sacs of the mature North American beaver, used in perfumery and folk medicine (Müller-Schwarze & Houlihan, 1991). Most metal complexes of MHBA are in their mixed-ligand form in which mono- (Ma et al., 2013; Köse et al., 2012) or bidentate (Thompson et al., 2015; Zaman et al., 2012) coordination through the carboxylic oxygen atoms take place. The latter coordination mode may give rise to the generation of polymeric metal complexes (Koizumi et al., 1984; Koziol et al., 1990). There are also structures in which MHBA molecules are non-coordinating (Zaman et al., 2013) or simultaneously coordinating and non-coordinating (Li et al., 2008).

A survey of the Cambridge Structural Database (CSD) (Groom & Allen, 2014) showed that coordination complexes of TEA or MHBA with many metals including those of the s-, d-, p-, and f-block elements have been documented. 50 entries correspond to structures in which TEA molecules are ligating, including 21 examples in a tetradentate mode (e.g. AKEXET, GEGTIV, IBOCOR, JOMDAS, LAKYAX, RUQSUR, SUTZIQ) and two polymeric structures (GOCVEZ, CUMSAE, CUMSAE01). The combination of tri- and tetradentate coordination modes is observed in five cases (MEVQIN, MEVQOT, EYIPAD, LAKYAX, MUCBIV). There is only one structure with TEA in a monodentate mode (KISMUW) and one with a bidentate mode (QAJDIP). The most frequently encountered tridentate coordination mode is also observed in the title compound and reported for 22 entries (e.g. ASUGEA, CABTEF, DAYPOJ, FOVKIL, ETOLNI, GUQXEV, IGALOR).

Synthesis and crystallization top

Refinement details top

Computing details top

Data collection: CrysAlis PRO (Agilent, 2014); cell refinement: CrysAlis PRO (Agilent, 2014); data reduction: CrysAlis PRO (Agilent, 2014); program(s) used to solve structure: OLEX2 (Dolomanov et al., 2009); program(s) used to refine structure: OLEX2 (Dolomanov et al., 2009); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).

Figures top

	Fig. 1. The molecular entities in the title structure, with displacement ellipsoids drawn at the 50% probability level. The parts of the asymmetric unit are identified by labelled atoms; all other atoms are generated by the symmetry operation (-x + 1, -y, -z + 1). H atoms have been omitted for clarity.
	Fig. 2. Different ring motifs generated by hydrogen bonds (shown as dashed lines). For clarity, H atoms have been omitted. Symmetry codes refer to Table 1.
	Fig. 3. The packing of the molecular entities in the crystal structure (shown as dashed lines). For clarity, H atoms have been omitted.

Bis(triethanolamine-κ³N,O,O')nickel(II) bis(3-hydroxybenzoate) tetrahydrate top

Crystal data top

[Ni(C₆H₁₅NO₃)₂](C₇H₅O₃)₂·4H₂O	F(000) = 748
M_r = 703.37	D_x = 1.422 Mg m⁻³
Monoclinic, P2₁/n	Cu Kα radiation, λ = 1.54184 Å
a = 8.40515 (12) Å	Cell parameters from 7605 reflections
b = 21.4397 (3) Å	θ = 4.1–75.8°
c = 9.48944 (14) Å	µ = 1.50 mm⁻¹
β = 106.1835 (15)°	T = 293 K
V = 1642.27 (4) Å³	Prism, light-green
Z = 2	0.32 × 0.14 × 0.12 mm

Data collection top

Agilent Xcalibur Ruby diffractometer	3399 independent reflections
Radiation source: Enhance (Cu) X-ray Source	3066 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.030
Detector resolution: 10.2576 pixels mm^-1	θ_max = 75.9°, θ_min = 4.1°
ω scans	h = −10→10
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2014)	k = −23→26
T_min = 0.912, T_max = 1.000	l = −11→7
12555 measured reflections

Refinement top

Refinement on F²	Hydrogen site location: mixed
Least-squares matrix: full	H atoms treated by a mixture of independent and constrained refinement
R[F² > 2σ(F²)] = 0.038	w = 1/[σ²(F_o²) + (0.0717P)² + 0.3396P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.115	(Δ/σ)_max < 0.001
S = 1.03	Δρ_max = 0.26 e Å⁻³
3399 reflections	Δρ_min = −0.44 e Å⁻³
226 parameters	Extinction correction: SHELXL2014 (Sheldrick, 2015), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
3 restraints	Extinction coefficient: 0.0013 (3)

Crystal data top

[Ni(C₆H₁₅NO₃)₂](C₇H₅O₃)₂·4H₂O	V = 1642.27 (4) Å³
M_r = 703.37	Z = 2
Monoclinic, P2₁/n	Cu Kα radiation
a = 8.40515 (12) Å	µ = 1.50 mm⁻¹
b = 21.4397 (3) Å	T = 293 K
c = 9.48944 (14) Å	0.32 × 0.14 × 0.12 mm
β = 106.1835 (15)°

Data collection top

Agilent Xcalibur Ruby diffractometer	3399 independent reflections
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2014)	3066 reflections with I > 2σ(I)
T_min = 0.912, T_max = 1.000	R_int = 0.030
12555 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.038	3 restraints
wR(F²) = 0.115	H atoms treated by a mixture of independent and constrained refinement
S = 1.03	Δρ_max = 0.26 e Å⁻³
3399 reflections	Δρ_min = −0.44 e Å⁻³
226 parameters

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
Ni1	0.5000	0.0000	0.5000	0.03393 (15)
O4	0.64514 (15)	0.07781 (5)	0.49590 (13)	0.0419 (3)
H4	0.658 (3)	0.0931 (8)	0.4149 (15)	0.063*
O5	0.34872 (15)	0.02307 (7)	0.29528 (13)	0.0436 (3)
O2	0.61445 (15)	−0.13123 (6)	0.82440 (16)	0.0516 (3)
N1	0.38809 (17)	0.06100 (6)	0.61955 (15)	0.0393 (3)
O1	0.34416 (15)	−0.11360 (6)	0.76086 (14)	0.0499 (3)
C7	0.4724 (2)	−0.14099 (8)	0.83791 (18)	0.0404 (3)
O3	0.1335 (2)	−0.23264 (8)	1.1285 (2)	0.0679 (4)
H3	0.0720	−0.2045	1.0868	0.102*
C3	0.2777 (2)	−0.23037 (8)	1.0902 (2)	0.0470 (4)
C2	0.3022 (2)	−0.18851 (8)	0.98698 (19)	0.0417 (4)
H2	0.2181	−0.1609	0.9419	0.050*
C10	0.4602 (3)	0.04530 (10)	0.77728 (19)	0.0513 (4)
H10A	0.3929	0.0133	0.8049	0.062*
H10B	0.4571	0.0820	0.8362	0.062*
C1	0.4506 (2)	−0.18721 (7)	0.94995 (18)	0.0391 (3)
C9	0.6038 (3)	0.13094 (9)	0.5707 (3)	0.0576 (5)
H9A	0.6147	0.1687	0.5179	0.069*
H9B	0.6797	0.1337	0.6685	0.069*
C6	0.5756 (3)	−0.22894 (9)	1.0159 (2)	0.0529 (5)
H6A	0.6756	−0.2287	0.9919	0.063*
C8	0.4288 (3)	0.12535 (9)	0.5813 (3)	0.0559 (5)
H8A	0.4134	0.1541	0.6552	0.067*
H8B	0.3526	0.1372	0.4880	0.067*
C4	0.4027 (3)	−0.27183 (9)	1.1560 (2)	0.0576 (5)
H4A	0.3879	−0.3001	1.2257	0.069*
C11	0.6364 (3)	0.02244 (11)	0.8101 (2)	0.0569 (5)
H11A	0.7093	0.0573	0.8081	0.068*
H11B	0.6700	0.0043	0.9075	0.068*
O6	0.1021 (3)	0.06378 (8)	0.7862 (2)	0.0809 (6)
H6	0.0736	0.0271	0.7755	0.121*
C5	0.5489 (3)	−0.27099 (10)	1.1178 (3)	0.0623 (5)
H5A	0.6319	−0.2993	1.1614	0.075*
C12	0.2050 (2)	0.05169 (10)	0.5721 (2)	0.0502 (4)
H12A	0.1833	0.0079	0.5847	0.060*
H12B	0.1663	0.0606	0.4679	0.060*
C13	0.1006 (3)	0.08968 (11)	0.6485 (3)	0.0642 (5)
H13A	0.1428	0.1320	0.6627	0.077*
H13B	−0.0126	0.0914	0.5865	0.077*
O2W	0.9448 (2)	0.06186 (9)	0.2035 (2)	0.0775 (5)
H2WA	0.8479	0.0746	0.1994	0.116*
H2WB	0.9679	0.0715	0.1246	0.116*
O1W	−0.06671 (19)	−0.13462 (7)	0.99258 (17)	0.0543 (3)
H1WA	−0.164 (4)	−0.1390 (14)	0.942 (3)	0.079 (9)*
H1WB	−0.092 (6)	−0.103 (2)	1.070 (6)	0.164 (18)*
H5	0.359 (3)	0.0545 (13)	0.266 (3)	0.061 (7)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Ni1	0.0372 (2)	0.0332 (2)	0.0320 (2)	−0.00273 (13)	0.01073 (15)	−0.00022 (13)
O4	0.0463 (6)	0.0390 (6)	0.0429 (6)	−0.0054 (5)	0.0164 (5)	0.0025 (5)
O5	0.0452 (6)	0.0453 (7)	0.0386 (6)	−0.0013 (5)	0.0085 (5)	0.0060 (5)
O2	0.0403 (6)	0.0553 (7)	0.0605 (8)	0.0006 (5)	0.0163 (6)	0.0172 (6)
N1	0.0426 (7)	0.0375 (7)	0.0391 (7)	−0.0020 (5)	0.0137 (6)	−0.0040 (5)
O1	0.0419 (6)	0.0581 (7)	0.0514 (7)	0.0046 (5)	0.0161 (5)	0.0212 (6)
C7	0.0417 (8)	0.0388 (8)	0.0408 (8)	−0.0003 (6)	0.0115 (6)	0.0049 (6)
O3	0.0679 (10)	0.0702 (10)	0.0772 (10)	0.0026 (7)	0.0396 (8)	0.0252 (8)
C3	0.0547 (10)	0.0437 (9)	0.0450 (9)	−0.0046 (7)	0.0179 (8)	0.0048 (7)
C2	0.0446 (9)	0.0387 (8)	0.0408 (8)	0.0010 (6)	0.0100 (7)	0.0068 (6)
C10	0.0624 (11)	0.0543 (10)	0.0376 (9)	−0.0011 (8)	0.0148 (8)	−0.0101 (7)
C1	0.0427 (8)	0.0358 (8)	0.0375 (8)	−0.0021 (6)	0.0088 (6)	0.0033 (6)
C9	0.0719 (13)	0.0399 (9)	0.0674 (12)	−0.0155 (8)	0.0303 (10)	−0.0105 (8)
C6	0.0481 (10)	0.0477 (10)	0.0625 (12)	0.0070 (8)	0.0145 (8)	0.0125 (8)
C8	0.0698 (13)	0.0356 (9)	0.0706 (12)	0.0017 (8)	0.0331 (10)	−0.0030 (8)
C4	0.0707 (13)	0.0491 (10)	0.0519 (11)	−0.0012 (9)	0.0154 (9)	0.0189 (8)
C11	0.0608 (12)	0.0601 (11)	0.0409 (9)	−0.0055 (9)	−0.0005 (8)	−0.0077 (8)
O6	0.1092 (15)	0.0688 (10)	0.0874 (12)	−0.0059 (10)	0.0650 (12)	−0.0136 (9)
C5	0.0629 (12)	0.0523 (11)	0.0677 (13)	0.0123 (9)	0.0115 (10)	0.0233 (10)
C12	0.0419 (9)	0.0595 (11)	0.0515 (10)	0.0006 (8)	0.0169 (8)	−0.0084 (8)
C13	0.0583 (12)	0.0652 (13)	0.0775 (14)	0.0078 (10)	0.0331 (11)	−0.0063 (11)
O2W	0.0663 (10)	0.0802 (11)	0.0964 (14)	0.0154 (9)	0.0401 (10)	0.0171 (10)
O1W	0.0444 (7)	0.0649 (9)	0.0559 (8)	0.0029 (6)	0.0179 (6)	−0.0039 (6)

Geometric parameters (Å, º) top

Ni1—O4ⁱ	2.0735 (11)	C1—C6	1.389 (2)
Ni1—O4	2.0734 (11)	C9—H9A	0.9700
Ni1—O5	2.0636 (12)	C9—H9B	0.9700
Ni1—O5ⁱ	2.0636 (12)	C9—C8	1.507 (3)
Ni1—N1ⁱ	2.1158 (13)	C6—H6A	0.9300
Ni1—N1	2.1158 (13)	C6—C5	1.385 (3)
O4—H4	0.869 (9)	C8—H8A	0.9700
O4—C9	1.435 (2)	C8—H8B	0.9700
O5—C11ⁱ	1.427 (2)	C4—H4A	0.9300
O5—H5	0.74 (3)	C4—C5	1.375 (3)
O2—C7	1.253 (2)	C11—O5ⁱ	1.427 (2)
N1—C10	1.488 (2)	C11—H11A	0.9700
N1—C8	1.491 (2)	C11—H11B	0.9700
N1—C12	1.491 (2)	O6—H6	0.8200
O1—C7	1.266 (2)	O6—C13	1.417 (3)
C7—C1	1.501 (2)	C5—H5A	0.9300
O3—H3	0.8200	C12—H12A	0.9700
O3—C3	1.359 (2)	C12—H12B	0.9700
C3—C2	1.386 (2)	C12—C13	1.521 (3)
C3—C4	1.385 (3)	C13—H13A	0.9700
C2—H2	0.9300	C13—H13B	0.9700
C2—C1	1.387 (2)	O2W—H2WA	0.8498
C10—H10A	0.9700	O2W—H2WB	0.8500
C10—H10B	0.9700	O1W—H1WA	0.83 (3)
C10—C11	1.508 (3)	O1W—H1WB	1.07 (5)

O4—Ni1—O4ⁱ	180.0	C2—C1—C6	119.57 (16)
O4ⁱ—Ni1—N1ⁱ	82.22 (5)	C6—C1—C7	121.18 (16)
O4—Ni1—N1ⁱ	97.78 (5)	O4—C9—H9A	109.6
O4—Ni1—N1	82.22 (5)	O4—C9—H9B	109.6
O4ⁱ—Ni1—N1	97.78 (5)	O4—C9—C8	110.20 (15)
O5—Ni1—O4ⁱ	89.95 (5)	H9A—C9—H9B	108.1
O5ⁱ—Ni1—O4	89.94 (5)	C8—C9—H9A	109.6
O5—Ni1—O4	90.05 (5)	C8—C9—H9B	109.6
O5ⁱ—Ni1—O4ⁱ	90.06 (5)	C1—C6—H6A	120.5
O5ⁱ—Ni1—O5	180.0	C5—C6—C1	118.99 (19)
O5—Ni1—N1	96.16 (5)	C5—C6—H6A	120.5
O5—Ni1—N1ⁱ	83.84 (5)	N1—C8—C9	112.60 (16)
O5ⁱ—Ni1—N1ⁱ	96.16 (5)	N1—C8—H8A	109.1
O5ⁱ—Ni1—N1	83.84 (5)	N1—C8—H8B	109.1
N1ⁱ—Ni1—N1	180.0	C9—C8—H8A	109.1
Ni1—O4—H4	122.6 (12)	C9—C8—H8B	109.1
C9—O4—Ni1	113.85 (10)	H8A—C8—H8B	107.8
C9—O4—H4	104.1 (12)	C3—C4—H4A	120.2
Ni1—O5—H5	118 (2)	C5—C4—C3	119.62 (17)
C11ⁱ—O5—Ni1	110.15 (11)	C5—C4—H4A	120.2
C11ⁱ—O5—H5	108 (2)	O5ⁱ—C11—C10	110.50 (15)
C10—N1—Ni1	106.39 (11)	O5ⁱ—C11—H11A	109.5
C10—N1—C8	113.44 (15)	O5ⁱ—C11—H11B	109.5
C10—N1—C12	111.71 (14)	C10—C11—H11A	109.5
C8—N1—Ni1	105.96 (11)	C10—C11—H11B	109.5
C8—N1—C12	109.74 (15)	H11A—C11—H11B	108.1
C12—N1—Ni1	109.32 (10)	C13—O6—H6	109.5
O2—C7—O1	123.06 (15)	C6—C5—H5A	119.2
O2—C7—C1	119.38 (15)	C4—C5—C6	121.53 (18)
O1—C7—C1	117.56 (14)	C4—C5—H5A	119.2
C3—O3—H3	109.5	N1—C12—H12A	107.8
O3—C3—C2	122.12 (17)	N1—C12—H12B	107.8
O3—C3—C4	118.51 (17)	N1—C12—C13	117.92 (17)
C4—C3—C2	119.37 (18)	H12A—C12—H12B	107.2
C3—C2—H2	119.5	C13—C12—H12A	107.8
C3—C2—C1	120.92 (16)	C13—C12—H12B	107.8
C1—C2—H2	119.5	O6—C13—C12	111.83 (19)
N1—C10—H10A	109.1	O6—C13—H13A	109.2
N1—C10—H10B	109.1	O6—C13—H13B	109.2
N1—C10—C11	112.46 (15)	C12—C13—H13A	109.2
H10A—C10—H10B	107.8	C12—C13—H13B	109.2
C11—C10—H10A	109.1	H13A—C13—H13B	107.9
C11—C10—H10B	109.1	H2WA—O2W—H2WB	109.4
C2—C1—C7	119.25 (14)	H1WA—O1W—H1WB	97 (3)

Ni1—O4—C9—C8	−22.1 (2)	C3—C2—C1—C7	−179.82 (16)
Ni1—N1—C10—C11	31.50 (18)	C3—C2—C1—C6	0.8 (3)
Ni1—N1—C8—C9	−40.0 (2)	C3—C4—C5—C6	0.9 (4)
Ni1—N1—C12—C13	177.98 (15)	C2—C3—C4—C5	−0.2 (3)
O4—C9—C8—N1	42.1 (2)	C2—C1—C6—C5	−0.1 (3)
O2—C7—C1—C2	166.38 (16)	C10—N1—C8—C9	76.4 (2)
O2—C7—C1—C6	−14.2 (3)	C10—N1—C12—C13	60.5 (2)
N1—C10—C11—O5ⁱ	−46.7 (2)	C1—C6—C5—C4	−0.7 (4)
N1—C12—C13—O6	−79.9 (2)	C8—N1—C10—C11	−84.60 (19)
O1—C7—C1—C2	−13.7 (2)	C8—N1—C12—C13	−66.2 (2)
O1—C7—C1—C6	165.70 (18)	C4—C3—C2—C1	−0.6 (3)
C7—C1—C6—C5	−179.51 (19)	C12—N1—C10—C11	150.73 (16)
O3—C3—C2—C1	180.00 (18)	C12—N1—C8—C9	−157.89 (17)
O3—C3—C4—C5	179.2 (2)

Symmetry code: (i) −x+1, −y, −z+1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1WA···O2ⁱⁱ	0.83 (3)	1.89 (3)	2.711 (2)	168 (3)
O1W—H1WB···O6ⁱⁱⁱ	1.06 (5)	1.63 (3)	2.674 (2)	168 (4)
O2W—H2WA···O1ⁱ	0.85	1.95	2.775 (2)	165
O2W—H2WB···O1Wⁱ	0.85	2.07	2.830 (2)	149
O3—H3···O1W	0.82	1.96	2.775 (2)	177
O4—H4···O1ⁱ	0.87 (2)	1.72 (2)	2.579 (2)	169 (2)
O5—H5···O2ⁱ	0.74 (3)	1.90 (3)	2.638 (2)	175 (3)
O6—H6···O2Wⁱ	0.82	1.93	2.728 (3)	165

Symmetry codes: (i) −x+1, −y, −z+1; (ii) x−1, y, z; (iii) −x, −y, −z+2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1WA···O2ⁱ	0.83 (3)	1.89 (3)	2.711 (2)	168 (3)
O1W—H1WB···O6ⁱⁱ	1.06 (5)	1.63 (3)	2.674 (2)	168 (4)
O2W—H2WA···O1ⁱⁱⁱ	0.85	1.95	2.775 (2)	165
O2W—H2WB···O1Wⁱⁱⁱ	0.85	2.07	2.830 (2)	149
O3—H3···O1W	0.82	1.96	2.775 (2)	177
O4—H4···O1ⁱⁱⁱ	0.870 (17)	1.720 (15)	2.579 (2)	169 (2)
O5—H5···O2ⁱⁱⁱ	0.74 (3)	1.90 (3)	2.638 (2)	175 (3)
O6—H6···O2Wⁱⁱⁱ	0.82	1.93	2.728 (3)	165.00

Symmetry codes: (i) x−1, y, z; (ii) −x, −y, −z+2; (iii) −x+1, −y, −z+1.

Experimental details

Crystal data
Chemical formula	[Ni(C₆H₁₅NO₃)₂](C₇H₅O₃)₂·4H₂O
M_r	703.37
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	293
a, b, c (Å)	8.40515 (12), 21.4397 (3), 9.48944 (14)
β (°)	106.1835 (15)
V (Å³)	1642.27 (4)
Z	2
Radiation type	Cu Kα
µ (mm⁻¹)	1.50
Crystal size (mm)	0.32 × 0.14 × 0.12

Data collection
Diffractometer	Agilent Xcalibur Ruby
Absorption correction	Multi-scan (CrysAlis PRO; Agilent, 2014)
T_min, T_max	0.912, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	12555, 3399, 3066
R_int	0.030
(sin θ/λ)_max (Å⁻¹)	0.629

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.038, 0.115, 1.03
No. of reflections	3399
No. of parameters	226
No. of restraints	3
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.26, −0.44

Computer programs: CrysAlis PRO (Agilent, 2014), OLEX2 (Dolomanov et al., 2009).

Acknowledgements

This work was supported by Grants of the Center of Science and Technology, Uzbekistan

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Volume 72| Part 5| May 2016| Pages 643-647

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