Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807048477/at2415sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807048477/at2415Isup2.hkl |
CCDC reference: 1168236
Crystals of the title compound were synthesized using hydrothermal method in a 23 ml Teflon-lined Parr bomb, which was then sealed. Lanthanum (III) nitrate hexahydrate (432.8 mg, 1 mmol), 2-amino-5-nitro-1,3-benzenedicarboxylic acid (452.3 mg, 2 mmol), ammonia (0.5 mol/l, 8 ml) and distilled water (10 g) were placed into the bomb and sealed. The bomb was then heated under autogenous pressure up to 453 K over the course of 7 d and allowed to cool at room temperature for 24 h. Upon opening the bomb, a clear colorless solution was decanted from small colorless crystals. These crystals were washed with distilled water followed by ethanol, and allowed to air-dry at room temperature.
H7A and H7B (for H2O) were located in difference syntheses and refined isotropically [O—H = 0.845 (19) and 0.859 (19) Å, Uiso(H) = 0.105 (18) and 0.101 (18) Å2, respectively]. The remaining H atoms were positioned geometrically, with O—H = 0.82 Å (for OH), N—H = 0.89 Å (for NH) and C—H = 0.93 Å for aromatic H, and constrained to ride on their parent atoms, with Uiso(H) = xUeq(C,N,O), where x = 1.2 for aromatic H atoms and x = 1.5 for all other H atoms.
In the synthesis of crystal structures by design, the assembly of molecular units in predefined arrangements is a key goal (Desiraju, 1995, 1997; Braga et al., 1998). Due to carboxyl groups are one of the most important classes of biological ligands, the coordination of metal-carboxyl groups complexes are of critical importance in biological systems, organic materials and coordination chemistry. Recently, carboxyl groups with variable coordination modes have been used to construct metal-organic supramolecular structures (McCann et al., 1996; McCann et al., 1995; Wai et al., 1990; Yaghi et al., 1996; Min & Lee 2002; Maira et al., 2001). We originally attempted to synthesize complexes featuring La metal chains by reaction of the lanthanum(III) ion with 2-amino-5-nitro-1,3-benzenedicarboxylic acid ligand. Unfortunately, we obtained only the title compound, (I), and we report herein its crystal structure.
In the molecule of (I) (Fig. 1), the ligand bond lengths and angles are within normal ranges (Allen et al., 1987). In the crystal structure, intramolecular N—H···O and N—H···N and intermolecular O—H···O, O—H···N and N—H···O hydrogen bonds (Table 1, Fig. 2) result in the formation of a supramolecular network structure.
For general background, see: Desiraju (1995, 1997); Braga et al. (1998); McCann et al. (1995, 1996); Wai et al. (1990); Yaghi et al. (1996); Min & Lee (2002); Maira et al. (2001). For bond length data, see: Allen et al. (1987).
Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT (Siemens, 1996); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Siemens, 1996); software used to prepare material for publication: SHELXTL (Siemens, 1996).
C8H6N2O6·H2O | F(000) = 1008 |
Mr = 244.16 | Dx = 1.734 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 1493 reflections |
a = 25.11 (2) Å | θ = 2.8–26.8° |
b = 6.5742 (16) Å | µ = 0.16 mm−1 |
c = 12.221 (2) Å | T = 273 K |
β = 112.002 (1)° | Prism, colourless |
V = 1870.6 (17) Å3 | 0.24 × 0.15 × 0.15 mm |
Z = 8 |
Bruker APEXII area-detector diffractometer | 1881 independent reflections |
Radiation source: fine-focus sealed tube | 965 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.032 |
φ and ω scans | θmax = 26.5°, θmin = 3.2° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −31→31 |
Tmin = 0.964, Tmax = 0.978 | k = −8→8 |
6078 measured reflections | l = −15→15 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.051 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.180 | w = 1/[σ2(Fo2) + (0.095P)2 + 0.002P] where P = (Fo2 + 2Fc2)/3 |
S = 1.08 | (Δ/σ)max < 0.001 |
1881 reflections | Δρmax = 0.29 e Å−3 |
165 parameters | Δρmin = −0.34 e Å−3 |
3 restraints | Extinction correction: SHELXL97 (Sheldrick, 1997), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.008 (2) |
C8H6N2O6·H2O | V = 1870.6 (17) Å3 |
Mr = 244.16 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 25.11 (2) Å | µ = 0.16 mm−1 |
b = 6.5742 (16) Å | T = 273 K |
c = 12.221 (2) Å | 0.24 × 0.15 × 0.15 mm |
β = 112.002 (1)° |
Bruker APEXII area-detector diffractometer | 1881 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 965 reflections with I > 2σ(I) |
Tmin = 0.964, Tmax = 0.978 | Rint = 0.032 |
6078 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 3 restraints |
wR(F2) = 0.180 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.08 | Δρmax = 0.29 e Å−3 |
1881 reflections | Δρmin = −0.34 e Å−3 |
165 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.53257 (9) | 0.2530 (4) | 1.04684 (18) | 0.0733 (7) | |
H1 | 0.5646 | 0.2449 | 1.0439 | 0.110* | |
O2 | 0.50729 (11) | 0.2165 (5) | 0.8602 (2) | 0.1059 (10) | |
O3 | 0.29265 (9) | 0.1319 (4) | 0.63238 (19) | 0.0811 (8) | |
O4 | 0.24250 (9) | 0.3056 (4) | 0.70420 (19) | 0.0803 (8) | |
O5 | 0.30586 (10) | 0.3713 (4) | 1.11162 (19) | 0.0856 (8) | |
O6 | 0.39304 (11) | 0.3002 (4) | 1.2188 (2) | 0.0978 (9) | |
O7 | 0.63154 (10) | 0.2295 (4) | 0.0267 (2) | 0.0743 (7) | |
N1 | 0.40250 (8) | 0.2104 (4) | 0.72988 (17) | 0.0512 (6) | |
H1A | 0.3902 | 0.0893 | 0.6978 | 0.077* | |
H1B | 0.4402 | 0.2200 | 0.7480 | 0.077* | |
H1C | 0.3846 | 0.3078 | 0.6787 | 0.077* | |
N2 | 0.35434 (12) | 0.3203 (4) | 1.1256 (2) | 0.0671 (8) | |
C1 | 0.43519 (11) | 0.2456 (4) | 0.9352 (2) | 0.0526 (7) | |
C2 | 0.39154 (13) | 0.2310 (4) | 0.8246 (3) | 0.0579 (8) | |
C3 | 0.33520 (12) | 0.2444 (4) | 0.8198 (2) | 0.0548 (8) | |
C4 | 0.32250 (12) | 0.2752 (4) | 0.9165 (2) | 0.0570 (8) | |
H4A | 0.2847 | 0.2900 | 0.9110 | 0.068* | |
C5 | 0.36690 (13) | 0.2835 (4) | 1.0216 (2) | 0.0543 (7) | |
C6 | 0.42259 (12) | 0.2684 (4) | 1.0317 (3) | 0.0549 (7) | |
H6 | 0.4520 | 0.2739 | 1.1058 | 0.066* | |
C7 | 0.49491 (12) | 0.2382 (5) | 0.9441 (3) | 0.0617 (8) | |
C8 | 0.28710 (11) | 0.2269 (4) | 0.7107 (2) | 0.0442 (7) | |
H7A | 0.6655 (11) | 0.222 (7) | 0.077 (3) | 0.105 (18)* | |
H7B | 0.6325 (18) | 0.218 (7) | −0.0425 (19) | 0.101 (18)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0405 (13) | 0.1081 (18) | 0.0635 (14) | −0.0010 (11) | 0.0108 (11) | −0.0007 (10) |
O2 | 0.0443 (13) | 0.214 (3) | 0.0611 (15) | 0.0020 (14) | 0.0221 (12) | 0.0004 (15) |
O3 | 0.0511 (13) | 0.119 (2) | 0.0651 (14) | −0.0077 (12) | 0.0123 (11) | −0.0048 (13) |
O4 | 0.0402 (13) | 0.126 (2) | 0.0684 (14) | 0.0065 (11) | 0.0126 (11) | 0.0054 (12) |
O5 | 0.0617 (16) | 0.128 (2) | 0.0783 (15) | 0.0096 (13) | 0.0387 (13) | −0.0036 (13) |
O6 | 0.0690 (18) | 0.171 (3) | 0.0483 (14) | 0.0109 (15) | 0.0165 (13) | −0.0057 (14) |
O7 | 0.0417 (13) | 0.1032 (19) | 0.0696 (16) | 0.0009 (11) | 0.0112 (12) | 0.0034 (13) |
N1 | 0.0270 (11) | 0.0904 (17) | 0.0363 (12) | −0.0005 (10) | 0.0119 (9) | −0.0018 (10) |
N2 | 0.0597 (18) | 0.0849 (19) | 0.0620 (17) | 0.0006 (14) | 0.0288 (15) | −0.0031 (13) |
C1 | 0.0363 (15) | 0.0686 (19) | 0.0512 (17) | −0.0007 (12) | 0.0142 (13) | 0.0003 (12) |
C2 | 0.0461 (17) | 0.074 (2) | 0.0523 (17) | 0.0027 (13) | 0.0175 (14) | 0.0012 (13) |
C3 | 0.0401 (16) | 0.073 (2) | 0.0498 (16) | 0.0001 (12) | 0.0150 (13) | 0.0044 (13) |
C4 | 0.0448 (17) | 0.0675 (19) | 0.0594 (18) | 0.0024 (12) | 0.0204 (15) | 0.0051 (13) |
C5 | 0.0513 (17) | 0.0668 (18) | 0.0483 (16) | 0.0012 (13) | 0.0228 (14) | −0.0009 (12) |
C6 | 0.0382 (15) | 0.0675 (19) | 0.0538 (17) | −0.0005 (12) | 0.0113 (13) | −0.0022 (13) |
C7 | 0.0409 (16) | 0.090 (2) | 0.0520 (17) | −0.0022 (14) | 0.0144 (15) | 0.0026 (14) |
C8 | 0.0284 (13) | 0.0701 (18) | 0.0332 (13) | −0.0006 (11) | 0.0105 (10) | 0.0007 (12) |
O1—C7 | 1.261 (3) | N1—H1C | 0.8900 |
O1—H1 | 0.8200 | N2—C5 | 1.440 (4) |
O2—C7 | 1.186 (3) | C1—C6 | 1.340 (4) |
O3—C8 | 1.194 (3) | C1—C2 | 1.388 (4) |
O4—C8 | 1.209 (3) | C1—C7 | 1.463 (4) |
O5—N2 | 1.211 (3) | C2—C3 | 1.397 (4) |
O6—N2 | 1.196 (3) | C3—C4 | 1.351 (4) |
O7—H7A | 0.845 (19) | C3—C8 | 1.430 (4) |
O7—H7B | 0.859 (19) | C4—C5 | 1.350 (4) |
N1—C2 | 1.293 (3) | C4—H4A | 0.9300 |
N1—H1A | 0.8900 | C5—C6 | 1.361 (4) |
N1—H1B | 0.8900 | C6—H6 | 0.9300 |
C7—O1—H1 | 109.5 | C4—C3—C8 | 115.8 (3) |
H7A—O7—H7B | 108 (3) | C2—C3—C8 | 121.5 (3) |
C2—N1—H1A | 109.5 | C5—C4—C3 | 117.2 (3) |
C2—N1—H1B | 109.5 | C5—C4—H4A | 121.4 |
H1A—N1—H1B | 109.5 | C3—C4—H4A | 121.4 |
C2—N1—H1C | 109.5 | C4—C5—C6 | 122.5 (3) |
H1A—N1—H1C | 109.5 | C4—C5—N2 | 118.1 (3) |
H1B—N1—H1C | 109.5 | C6—C5—N2 | 119.3 (3) |
O6—N2—O5 | 125.5 (3) | C1—C6—C5 | 120.2 (3) |
O6—N2—C5 | 116.9 (3) | C1—C6—H6 | 119.9 |
O5—N2—C5 | 117.6 (3) | C5—C6—H6 | 119.9 |
C6—C1—C2 | 120.3 (3) | O2—C7—O1 | 121.9 (3) |
C6—C1—C7 | 120.8 (3) | O2—C7—C1 | 122.2 (3) |
C2—C1—C7 | 118.9 (3) | O1—C7—C1 | 115.9 (3) |
N1—C2—C1 | 121.6 (3) | O3—C8—O4 | 123.7 (3) |
N1—C2—C3 | 121.4 (3) | O3—C8—C3 | 118.6 (3) |
C1—C2—C3 | 117.0 (3) | O4—C8—C3 | 117.7 (3) |
C4—C3—C2 | 122.7 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1B···O2 | 0.89 | 1.73 | 2.514 (3) | 146 |
O7—H7B···O3i | 0.86 (2) | 2.57 (3) | 3.254 (4) | 137 (3) |
O7—H7B···N1i | 0.86 (2) | 2.12 (2) | 2.927 (4) | 156 (4) |
N1—H1C···O6ii | 0.89 | 2.62 | 3.225 (3) | 126 |
N1—H1C···N2ii | 0.89 | 2.57 | 3.384 (3) | 152 |
N1—H1C···O7i | 0.89 | 2.44 | 2.927 (4) | 115 |
N1—H1B···O2iii | 0.89 | 2.19 | 2.866 (4) | 132 |
N1—H1A···O6iv | 0.89 | 2.57 | 3.365 (3) | 149 |
O1—H1···O7v | 0.82 | 1.77 | 2.592 (4) | 176 |
Symmetry codes: (i) −x+1, y, −z+1/2; (ii) x, −y+1, z−1/2; (iii) −x+1, y, −z+3/2; (iv) x, −y, z−1/2; (v) x, y, z+1. |
Experimental details
Crystal data | |
Chemical formula | C8H6N2O6·H2O |
Mr | 244.16 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 273 |
a, b, c (Å) | 25.11 (2), 6.5742 (16), 12.221 (2) |
β (°) | 112.002 (1) |
V (Å3) | 1870.6 (17) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.16 |
Crystal size (mm) | 0.24 × 0.15 × 0.15 |
Data collection | |
Diffractometer | Bruker APEXII area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.964, 0.978 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 6078, 1881, 965 |
Rint | 0.032 |
(sin θ/λ)max (Å−1) | 0.627 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.180, 1.08 |
No. of reflections | 1881 |
No. of parameters | 165 |
No. of restraints | 3 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.29, −0.34 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Siemens, 1996), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL (Siemens, 1996).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1B···O2 | 0.89 | 1.73 | 2.514 (3) | 146 |
O7—H7B···O3i | 0.859 (19) | 2.57 (3) | 3.254 (4) | 137 (3) |
O7—H7B···N1i | 0.859 (19) | 2.12 (2) | 2.927 (4) | 156 (4) |
N1—H1C···O6ii | 0.89 | 2.62 | 3.225 (3) | 126 |
N1—H1C···N2ii | 0.89 | 2.57 | 3.384 (3) | 152 |
N1—H1C···O7i | 0.89 | 2.44 | 2.927 (4) | 115 |
N1—H1B···O2iii | 0.89 | 2.19 | 2.866 (4) | 132 |
N1—H1A···O6iv | 0.89 | 2.57 | 3.365 (3) | 149 |
O1—H1···O7v | 0.82 | 1.77 | 2.592 (4) | 176 |
Symmetry codes: (i) −x+1, y, −z+1/2; (ii) x, −y+1, z−1/2; (iii) −x+1, y, −z+3/2; (iv) x, −y, z−1/2; (v) x, y, z+1. |
In the synthesis of crystal structures by design, the assembly of molecular units in predefined arrangements is a key goal (Desiraju, 1995, 1997; Braga et al., 1998). Due to carboxyl groups are one of the most important classes of biological ligands, the coordination of metal-carboxyl groups complexes are of critical importance in biological systems, organic materials and coordination chemistry. Recently, carboxyl groups with variable coordination modes have been used to construct metal-organic supramolecular structures (McCann et al., 1996; McCann et al., 1995; Wai et al., 1990; Yaghi et al., 1996; Min & Lee 2002; Maira et al., 2001). We originally attempted to synthesize complexes featuring La metal chains by reaction of the lanthanum(III) ion with 2-amino-5-nitro-1,3-benzenedicarboxylic acid ligand. Unfortunately, we obtained only the title compound, (I), and we report herein its crystal structure.
In the molecule of (I) (Fig. 1), the ligand bond lengths and angles are within normal ranges (Allen et al., 1987). In the crystal structure, intramolecular N—H···O and N—H···N and intermolecular O—H···O, O—H···N and N—H···O hydrogen bonds (Table 1, Fig. 2) result in the formation of a supramolecular network structure.