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Acta Crystallogr Sect E Struct Rep Online. 2010 April 1; 66(Pt 4): m365.
Published online 2010 March 6. doi:  10.1107/S1600536810007580
PMCID: PMC2983864

Bis(3,5-dinitro­benzoato-κO 1)tetra­methano­lcobalt(II)

Abstract

The CoII atom (site symmetry An external file that holds a picture, illustration, etc.
Object name is e-66-0m365-efi1.jpg) in the title complex, [Co(C7H3N2O6)2(CH3OH)4], exists within an octa­hedral O6 donor set defined by two O-monodentate 3,5-dinitro­benzoate anions and four methanol O atoms. An intra­molecular Om—H(...)Oc (m = methanol and c = carbon­yl) hydrogen bond leads to the formation of an S(6) ring. In the crystal, centrosymmetrically related mol­ecules associate via further Om—H(...)Oc hydrogen bonds, leading to linear supra­molecular chains propagating along the a-axis direction.

Related literature

For the structures of related complexes, see: Tahir et al. (1996 [triangle]); Yang et al. (2000 [triangle]); Jin et al. (2008 [triangle]). For a description of the Cambridge Structural Database, see: Allen (2002 [triangle]).

An external file that holds a picture, illustration, etc.
Object name is e-66-0m365-scheme1.jpg

Experimental

Crystal data

  • [Co(C7H3N2O6)2(CH4O)4]
  • M r = 609.33
  • Triclinic, An external file that holds a picture, illustration, etc.
Object name is e-66-0m365-efi2.jpg
  • a = 6.4068 (8) Å
  • b = 8.7660 (11) Å
  • c = 12.1603 (16) Å
  • α = 90.411 (2)°
  • β = 100.407 (2)°
  • γ = 102.214 (2)°
  • V = 655.77 (14) Å3
  • Z = 1
  • Mo Kα radiation
  • μ = 0.74 mm−1
  • T = 293 K
  • 0.35 × 0.30 × 0.05 mm

Data collection

  • Bruker SMART APEX diffractometer
  • Absorption correction: multi-scan (SADABS; Sheldrick, 1996 [triangle]) T min = 0.669, T max = 0.746
  • 6372 measured reflections
  • 2999 independent reflections
  • 2388 reflections with I > 2σ(I)
  • R int = 0.028

Refinement

  • R[F 2 > 2σ(F 2)] = 0.043
  • wR(F 2) = 0.110
  • S = 1.03
  • 2999 reflections
  • 188 parameters
  • 2 restraints
  • H atoms treated by a mixture of independent and constrained refinement
  • Δρmax = 0.38 e Å−3
  • Δρmin = −0.30 e Å−3

Data collection: APEX2 (Bruker, 2008 [triangle]); cell refinement: SAINT (Bruker, 2008 [triangle]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: ORTEP-3 (Farrugia, 1997 [triangle]) and DIAMOND (Brandenburg, 2006 [triangle]); software used to prepare material for publication: publCIF (Westrip, 2010 [triangle]).

Table 1
Selected bond lengths (Å)
Table 2
Hydrogen-bond geometry (Å, °)

Supplementary Material

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536810007580/hb5347sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536810007580/hb5347Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

The authors are grateful to the SAP (UGC), New Delhi, India, for financial support.

supplementary crystallographic information

Comment

The Co(II) atom in (I), Fig. 1, is located on a crystallographic centre of inversion and exists within an octahedral O6 donor set defined by two carboxylate-O1 atoms and four methanol-O atoms. The Co–O1 bond distance [Co–O1 = 2.0666 (17) Å] is comparable to those, i.e. 2.0525 (20) and 2.0587 (19) Å, found in the related tetra-aqua-bis(3,5-dinitrobenzoato-O)cobalt(II) tetrahydrate structure (Tahir et al., 1996; Yang et al., 2000; Jin et al., 2008). A small disparity in the Co—Omethanol bond distances in (I) [Co–O7 = 2.1094 (16) and Co–O8 = 2.0645 (18) Å] is noted. The methanol-O7–H hydrogen forms an intramolecular O–H···O hydrogen bond with the carbonyl-O2 atom to close an almost planar {Co–O–C–O···H–O} S(6) ring, Table 1. The methanol-O8–H also forms a hydrogen bond to the carbonyl-O2 atom on a centrosymmetrically related complex, Table 1. This results in the formation of 12-membered {Co–O–H···O–C–O}2 synthons and linear supramolecular chains along the a axis, Fig. 2. It is noted that the packing of molecules brings into close proximity two nitro-O atoms, i.e. O4···O4ii = 2.756 (3) Å for 3-x, -y, 2-z. While the nature of this interaction is not obvious, there are approximately 50 precedents for such Onitro···Onitro contacts < 2.70 Å in the crystallographic literature (Allen, 2002).

Experimental

All chemicals purchased from commercial sources (AR/GR grade) were used without further purification. The crystalline sodium salt of 3,5-dinitrobenzoic acid was prepared by neutralising 3,5-dinitrobenzoic acid (1.00 g, 4.70 mmol) by NaOH (1.88 g, 4.70 mmol) in water. On concentration the solution yielded the sodium salt (1). To a purple solution of CoCl2.6H2O (0.50 g, 2.10 mmol) in water (15 ml) was added, with stirring, a solution of (1) (0.98 g, 4.20 mmol) in a mixture of water (3 ml) and methanol (140 ml) when the colour of the mixture turned pink. The solution was then heated under reflux for 6 h. Pink prisms of (I) were obtained from the filtrate after 25 days on slow evaporation.

Refinement

Carbon-bound H-atoms were placed in calculated positions (C—H 0.93 to 0.96 Å) and were included in the refinement in the riding model approximation, with Uiso(H) set to 1.2 to 1.5Uequiv(C). The methanol H-atoms were located in a difference Fourier map, and were refined with a distance restraint of O–H 0.85±0.01 Å; their Uiso values were freely refined

Figures

Fig. 1.
The molecular structure of (I) extended to show the coordination geometry for the Co(II) atom, showing displacement ellipsoids at the 50% probability level. Symmetry operation i: 1-x, 1-y, 1-z.
Fig. 2.
Linear supramolecular chain along the a axis in (I) mediated by O—H···O hydrogen bonding. These and the intramolecular O–H···O hydrogen bonds are shown as blue dashed lines.

Crystal data

[Co(C7H3N2O6)2(CH4O)4]Z = 1
Mr = 609.33F(000) = 313
Triclinic, P1Dx = 1.543 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 6.4068 (8) ÅCell parameters from 1592 reflections
b = 8.7660 (11) Åθ = 2.4–22.8°
c = 12.1603 (16) ŵ = 0.74 mm1
α = 90.411 (2)°T = 293 K
β = 100.407 (2)°Prism, pink
γ = 102.214 (2)°0.35 × 0.30 × 0.05 mm
V = 655.77 (14) Å3

Data collection

Bruker SMART APEX diffractometer2999 independent reflections
Radiation source: fine-focus sealed tube2388 reflections with I > 2σ(I)
graphiteRint = 0.028
ω scansθmax = 27.5°, θmin = 1.7°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)h = −8→8
Tmin = 0.669, Tmax = 0.746k = −11→11
6372 measured reflectionsl = −15→15

Refinement

Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.043Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.110H atoms treated by a mixture of independent and constrained refinement
S = 1.03w = 1/[σ2(Fo2) + (0.0522P)2 + 0.1427P] where P = (Fo2 + 2Fc2)/3
2999 reflections(Δ/σ)max = 0.001
188 parametersΔρmax = 0.38 e Å3
2 restraintsΔρmin = −0.30 e Å3

Special details

Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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.

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

xyzUiso*/Ueq
Co0.50000.50000.50000.03530 (16)
O10.6891 (3)0.3924 (2)0.61732 (14)0.0514 (5)
O20.8795 (3)0.2811 (2)0.51696 (14)0.0471 (4)
O31.4087 (5)0.0083 (4)0.7142 (2)0.1213 (12)
O41.4957 (5)0.0210 (4)0.8875 (2)0.1234 (12)
O51.0327 (5)0.2304 (4)1.1038 (2)0.1159 (11)
O60.8093 (6)0.3608 (4)1.0193 (2)0.1090 (10)
O70.3342 (3)0.5533 (2)0.62522 (14)0.0458 (4)
H7O0.255 (4)0.614 (3)0.595 (2)0.075 (11)*
O80.2673 (3)0.2953 (2)0.46261 (18)0.0550 (5)
H8O0.145 (3)0.291 (4)0.481 (3)0.075 (10)*
N11.3845 (5)0.0471 (3)0.8033 (2)0.0710 (8)
N20.9450 (5)0.2836 (4)1.0197 (2)0.0775 (8)
C10.8312 (4)0.3181 (3)0.60687 (19)0.0379 (5)
C20.9496 (4)0.2659 (3)0.7142 (2)0.0383 (5)
C31.1103 (4)0.1830 (3)0.7114 (2)0.0420 (6)
H31.14680.15920.64360.050*
C41.2149 (4)0.1366 (3)0.8100 (2)0.0498 (6)
C51.1687 (5)0.1679 (3)0.9125 (2)0.0547 (7)
H51.24200.13560.97830.066*
C61.0075 (5)0.2500 (3)0.9125 (2)0.0525 (7)
C70.8985 (4)0.2998 (3)0.8158 (2)0.0468 (6)
H70.79140.35580.81910.056*
C80.4162 (5)0.5914 (4)0.7407 (2)0.0604 (8)
H8A0.30340.61560.77550.091*
H8B0.53560.68030.74910.091*
H8C0.46520.50410.77550.091*
C90.2797 (6)0.1460 (3)0.4244 (3)0.0787 (11)
H9A0.20180.12550.34870.118*
H9B0.21660.06860.47120.118*
H9C0.42920.14220.42710.118*

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
Co0.0357 (3)0.0419 (3)0.0339 (3)0.01829 (19)0.00943 (18)0.00124 (18)
O10.0558 (11)0.0699 (12)0.0409 (10)0.0385 (10)0.0118 (8)0.0069 (8)
O20.0428 (9)0.0662 (12)0.0387 (9)0.0257 (8)0.0080 (7)0.0001 (8)
O30.151 (3)0.177 (3)0.083 (2)0.133 (3)0.0311 (18)0.0207 (19)
O40.125 (2)0.193 (3)0.086 (2)0.117 (2)0.0082 (17)0.044 (2)
O50.157 (3)0.168 (3)0.0389 (14)0.074 (2)0.0149 (15)0.0175 (16)
O60.167 (3)0.132 (2)0.0629 (16)0.085 (2)0.0510 (17)0.0109 (15)
O70.0501 (11)0.0574 (11)0.0379 (9)0.0259 (9)0.0125 (8)0.0023 (8)
O80.0428 (11)0.0497 (11)0.0767 (13)0.0086 (9)0.0242 (10)−0.0125 (9)
N10.0722 (17)0.088 (2)0.0672 (18)0.0498 (16)0.0113 (14)0.0207 (15)
N20.109 (2)0.086 (2)0.0466 (16)0.0382 (18)0.0211 (15)0.0030 (14)
C10.0346 (12)0.0411 (13)0.0400 (13)0.0133 (10)0.0064 (10)0.0019 (10)
C20.0375 (12)0.0384 (12)0.0398 (13)0.0105 (10)0.0064 (10)0.0032 (10)
C30.0429 (13)0.0482 (14)0.0377 (13)0.0173 (11)0.0060 (10)0.0027 (10)
C40.0463 (14)0.0495 (15)0.0560 (16)0.0200 (12)0.0046 (12)0.0081 (12)
C50.0603 (17)0.0605 (17)0.0422 (15)0.0184 (14)−0.0003 (12)0.0095 (12)
C60.0645 (17)0.0566 (16)0.0380 (14)0.0176 (14)0.0080 (12)0.0011 (12)
C70.0509 (15)0.0488 (14)0.0458 (14)0.0205 (12)0.0107 (11)0.0031 (11)
C80.078 (2)0.0658 (19)0.0409 (15)0.0215 (16)0.0146 (14)−0.0014 (13)
C90.084 (2)0.0532 (18)0.104 (3)0.0050 (17)0.044 (2)−0.0217 (18)

Geometric parameters (Å, °)

Co—O82.0645 (18)N2—C61.476 (4)
Co—O8i2.0645 (18)C1—C21.511 (3)
Co—O12.0666 (17)C2—C71.380 (3)
Co—O1i2.0666 (16)C2—C31.385 (3)
Co—O72.1094 (16)C3—C41.373 (3)
Co—O7i2.1094 (16)C3—H30.9300
O1—C11.250 (3)C4—C51.371 (4)
O2—C11.247 (3)C5—C61.378 (4)
O3—N11.179 (4)C5—H50.9300
O4—N11.190 (3)C6—C71.379 (4)
O5—N21.220 (4)C7—H70.9300
O6—N21.209 (4)C8—H8A0.9600
O7—C81.418 (3)C8—H8B0.9600
O7—H7O0.85 (3)C8—H8C0.9600
O8—C91.408 (3)C9—H9A0.9600
O8—H8O0.85 (3)C9—H9B0.9600
N1—C41.482 (3)C9—H9C0.9600
O8—Co—O191.36 (8)C7—C2—C3119.3 (2)
O8i—Co—O188.64 (8)C7—C2—C1120.5 (2)
O8—Co—O1i88.64 (8)C3—C2—C1120.2 (2)
O8i—Co—O1i91.36 (8)C4—C3—C2119.1 (2)
O8—Co—O788.14 (7)C4—C3—H3120.5
O8i—Co—O791.86 (7)C2—C3—H3120.5
O1—Co—O789.22 (7)C5—C4—C3123.3 (2)
O1i—Co—O790.78 (7)C5—C4—N1119.3 (2)
O8—Co—O7i91.86 (7)C3—C4—N1117.4 (2)
O8i—Co—O7i88.14 (7)C4—C5—C6116.3 (2)
O1—Co—O7i90.78 (7)C4—C5—H5121.9
O1i—Co—O7i89.22 (7)C6—C5—H5121.9
O1—Co—O1i180.0C5—C6—C7122.6 (2)
O7—Co—O7i180.0C5—C6—N2119.1 (3)
O8—Co—O8i180.0C7—C6—N2118.3 (3)
C1—O1—Co130.70 (16)C6—C7—C2119.4 (2)
C8—O7—Co128.82 (16)C6—C7—H7120.3
C8—O7—H7O113 (2)C2—C7—H7120.3
Co—O7—H7O105 (2)O7—C8—H8A109.5
C9—O8—Co131.57 (18)O7—C8—H8B109.5
C9—O8—H8O110 (2)H8A—C8—H8B109.5
Co—O8—H8O118 (2)O7—C8—H8C109.5
O3—N1—O4122.3 (3)H8A—C8—H8C109.5
O3—N1—C4118.6 (3)H8B—C8—H8C109.5
O4—N1—C4119.1 (3)O8—C9—H9A109.5
O6—N2—O5123.7 (3)O8—C9—H9B109.5
O6—N2—C6118.5 (3)H9A—C9—H9B109.5
O5—N2—C6117.8 (3)O8—C9—H9C109.5
O2—C1—O1126.1 (2)H9A—C9—H9C109.5
O2—C1—C2118.0 (2)H9B—C9—H9C109.5
O1—C1—C2115.9 (2)
O8—Co—O1—C187.5 (2)C1—C2—C3—C4−179.8 (2)
O8i—Co—O1—C1−92.5 (2)C2—C3—C4—C50.0 (4)
O7—Co—O1—C1175.6 (2)C2—C3—C4—N1179.5 (2)
O7i—Co—O1—C1−4.4 (2)O3—N1—C4—C5173.0 (3)
O8—Co—O7—C8125.9 (2)O4—N1—C4—C5−9.2 (5)
O8i—Co—O7—C8−54.1 (2)O3—N1—C4—C3−6.5 (5)
O1—Co—O7—C834.5 (2)O4—N1—C4—C3171.2 (3)
O1i—Co—O7—C8−145.5 (2)C3—C4—C5—C60.2 (4)
O1—Co—O8—C9−58.0 (3)N1—C4—C5—C6−179.3 (3)
O1i—Co—O8—C9122.0 (3)C4—C5—C6—C7−0.5 (4)
O7—Co—O8—C9−147.1 (3)C4—C5—C6—N2178.2 (3)
O7i—Co—O8—C932.9 (3)O6—N2—C6—C5177.2 (3)
Co—O1—C1—O2−6.2 (4)O5—N2—C6—C5−3.4 (5)
Co—O1—C1—C2175.42 (15)O6—N2—C6—C7−4.0 (5)
O2—C1—C2—C7−178.2 (2)O5—N2—C6—C7175.4 (3)
O1—C1—C2—C70.3 (4)C5—C6—C7—C20.6 (4)
O2—C1—C2—C31.6 (4)N2—C6—C7—C2−178.1 (3)
O1—C1—C2—C3−179.9 (2)C3—C2—C7—C6−0.3 (4)
C7—C2—C3—C40.0 (4)C1—C2—C7—C6179.5 (2)

Symmetry codes: (i) −x+1, −y+1, −z+1.

Hydrogen-bond geometry (Å, °)

D—H···AD—HH···AD···AD—H···A
O7—H7o···O2i0.85 (3)1.840 (15)2.645 (2)158 (3)
O8—H8o···O2ii0.85 (3)1.817 (10)2.662 (2)179 (3)

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

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5347).

References

  • Allen, F. H. (2002). Acta Cryst. B58, 380–388. [PubMed]
  • Brandenburg, K. (2006). DIAMOND Crystal Impact GbR, Bonn, Germany.
  • Bruker (2008). APEX2 and SAINT Bruker AXS Inc., Madison, Wisconsin, USA.
  • Farrugia, L. J. (1997). J. Appl. Cryst.30, 565.
  • Jin, Y., Che, Y. X. & Zheng, J. M. (2008). Inorg. Chim. Acta, 361, 2799–2803.
  • Sheldrick, G. M. (1996). SADABS University of Göttingen, Germany.
  • Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. [PubMed]
  • Tahir, M. N., Ülkü, D. & Mövsümov, E. M. (1996). Acta Cryst. C52, 1392–1394.
  • Westrip, S. P. (2010). publCIF In preparation.
  • Yang, G., Zhu, H.-G., Zhang, L.-Z., Cai, Z.-G. & Chen, X.-M. (2000). Aust. J. Chem 53, 601–605.

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