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Acta Cryst. (2009). E65, m702    [ doi:10.1107/S1600536809019904 ]

Pentaaqua(1H-benzimidazole-5,6-dicarboxylato-[kappa]N3)cobalt(II) pentahydrate

W.-D. Song, H. Wang, S.-J. Li, P.-W. Qin and S.-W. Hu

Abstract top

In the title mononuclear complex, [Co(C9H4N2O4)(H2O)5]·5H2O, the CoII atom exhibits a distorted octahedral geometry involving an N atom of a 1H-benzimidazole-5,6-dicarboxylate ligand and five water O atoms. A supramolecular network is generated through intermolecular O-H...O hydrogen-bonding interactions involving the coordinated and uncoordinated water molecules and the carboxyl O atoms of the organic ligand. An intermolecular N-H...O hydrogen bond is also observed.

Comment top

In the structural investigation of 1H-benzimidazole-5,6-dicarboxylate complexes, it has been found that the 1H-benzimidazole-5,6-dicarboxylic acid can function as a multidentate ligand (Gao et al., 2008; Lo et al., 2007; Yao et al., 2008), with versatile binding and coordination modes. In this paper, we report the crystal structure of the title compound, a new cobalt(II) complex obtained by the reaction of the 1H-benzimidazole-5,6-dicarboxylic acid and cobalt chloride in alkaline aqueous solution.

As illustrated in Figure 1, the cobalt(II) atom is six-coordinated by one N atom from a 1H-benzimidazole-5,6-dicarboxylate ligand and five O atoms from five water molecules, displaying a distorted octahedral geometry. The O1/O2/C7 and O3/O4/C8 carboxylate groups are tilted with respect to the plane of the benzimidazole ring system by 36.0 (3) and 68.1 (2)°, respectively. Intermolecular O—H···O hydrogen bonding interactions (Table 1) form a three-dimensional supramolecular network involving the coordinated and uncoordinated water molecules as donors and the carboxylate O atoms of the organic ligand as acceptors (Fig. 2). An intermolecular N—H···O hydrogen bond is also observed.

Related literature top

For the crystal structures of related compounds, see: Gao et al. (2008); Lo et al. (2007); Yao et al. (2008).

Experimental top

A mixture of cobalt chloride (1 mmol), 1H-benzimidazole-5,6-dicarboxylic acid (1 mmol), NaOH (1.5 mmol) and H2O (12 ml) was placed in a 23 ml Teflon reactor, heated to 433 K for three days and then cooled to room temperature at a rate of 10 K h-1. The crystals obtained were washed with water and dryed in air.

Refinement top

Carbon and nitrogen bound H atoms were placed at calculated positions and were treated as riding on the parent atoms, with C—H = 0.93 Å, N—H = 0.86 Å, and with Uiso(H) = 1.2 Ueq(C, N). The water H atoms were located in a difference map and were refined with distance restraints of O—H = 0.84 Å, H···H = 1.39 Å and with Uiso = 1.5 Ueq(O).

Computing details top

Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The structure of the title compound, showing the atomic numbering scheme. Non-H atoms are shown with 30% probability displacement ellipsoids.
[Figure 2] Fig. 2. Packing diagram of the title compound viewed along the b axis. Intermolecular hydrogen bonds are shown as dashed lines.
Pentaaqua(1H-benzimidazole-5,6-dicarboxylato-κN3)cobalt(II) pentahydrate top
Crystal data top
[Co(C9H4N2O4)(H2O)5]·5H2OZ = 2
Mr = 443.23F000 = 462
Triclinic, P1Dx = 1.618 Mg m−3
Hall symbol: -P 1Mo Kα radiation
λ = 0.71073 Å
a = 6.8454 (14) ÅCell parameters from 3600 reflections
b = 11.480 (2) Åθ = 1.4–28º
c = 12.408 (3) ŵ = 1.02 mm−1
α = 78.02 (3)ºT = 293 K
β = 78.57 (3)ºBlock, pink
γ = 74.80 (3)º0.31 × 0.26 × 0.21 mm
V = 909.7 (4) Å3
Data collection top
Rigaku/MSC Mercury CCD
diffractometer		3269 independent reflections
Radiation source: fine-focus sealed tube2010 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.050
T = 293 Kθmax = 25.2º
ω scansθmin = 3.1º
Absorption correction: multi-scan
(REQAB; Jacobson, 1998)		h = −8→8
Tmin = 0.744, Tmax = 0.815k = −13→13
7307 measured reflectionsl = −13→14
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.048H-atom parameters constrained
wR(F2) = 0.148  w = 1/[σ2(Fo2) + (0.025P)2 + 3.508P]
where P = (Fo2 + 2Fc2)/3
S = 1.19(Δ/σ)max < 0.001
3269 reflectionsΔρmax = 0.85 e Å−3
235 parametersΔρmin = −1.00 e Å−3
30 restraintsExtinction correction: none
Primary atom site location: structure-invariant direct methods
Crystal data top
[Co(C9H4N2O4)(H2O)5]·5H2Oγ = 74.80 (3)º
Mr = 443.23V = 909.7 (4) Å3
Triclinic, P1Z = 2
a = 6.8454 (14) ÅMo Kα
b = 11.480 (2) ŵ = 1.02 mm−1
c = 12.408 (3) ÅT = 293 K
α = 78.02 (3)º0.31 × 0.26 × 0.21 mm
β = 78.57 (3)º
Data collection top
Rigaku/MSC Mercury CCD
diffractometer		3269 independent reflections
Absorption correction: multi-scan
(REQAB; Jacobson, 1998)		2010 reflections with I > 2σ(I)
Tmin = 0.744, Tmax = 0.815Rint = 0.050
7307 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.04830 restraints
wR(F2) = 0.148H-atom parameters constrained
S = 1.19Δρmax = 0.85 e Å−3
3269 reflectionsΔρmin = −1.00 e Å−3
235 parameters
Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Co20.10067 (16)0.09663 (9)0.24088 (8)0.0301 (3)
O1−0.1942 (8)0.8137 (4)0.2444 (4)0.0386 (13)
O2−0.4507 (8)0.7825 (5)0.3797 (4)0.0417 (13)
O30.0523 (8)0.6536 (5)0.0471 (4)0.0420 (14)
O4−0.2859 (8)0.6922 (5)0.0637 (4)0.0431 (14)
N1−0.0099 (9)0.2334 (5)0.3409 (5)0.0292 (14)
N2−0.1506 (9)0.3081 (5)0.4971 (5)0.0351 (15)
H2−0.19390.30960.56680.042*
C1−0.2252 (10)0.6102 (6)0.3117 (6)0.0272 (15)
C2−0.1306 (10)0.5624 (6)0.2126 (6)0.0272 (16)
C3−0.0533 (11)0.4390 (6)0.2134 (6)0.0292 (16)
H30.00950.40840.14810.035*
C4−0.0722 (10)0.3611 (6)0.3154 (6)0.0259 (15)
C5−0.1612 (11)0.4083 (6)0.4130 (5)0.0257 (15)
C6−0.2406 (11)0.5323 (6)0.4127 (6)0.0328 (17)
H6−0.30250.56230.47840.039*
C7−0.2974 (11)0.7460 (7)0.3101 (6)0.0323 (17)
C8−0.1215 (11)0.6451 (6)0.0995 (6)0.0311 (17)
C9−0.0613 (11)0.2089 (6)0.4507 (6)0.0320 (17)
H9−0.03730.13010.49130.038*
O1W−0.1050 (7)0.1798 (4)0.1266 (4)0.0365 (12)
H1W−0.07130.23100.07180.055*
H2W−0.16280.13230.10820.055*
O2W0.3202 (7)0.1855 (4)0.1370 (4)0.0351 (12)
H4W0.36300.22560.17310.053*
H3W0.29820.22510.07390.053*
O3W0.2255 (9)−0.0454 (5)0.1511 (5)0.0526 (16)
H5W0.2351−0.11960.17870.079*
H6W0.2442−0.03420.08110.079*
O4W−0.1232 (8)0.0001 (4)0.3351 (4)0.0370 (12)
H7W−0.23020.05640.33680.056*
H8W−0.1389−0.05750.30790.056*
O5W0.2965 (8)0.0074 (4)0.3565 (4)0.0393 (13)
H9W0.35480.06200.36040.059*
H10W0.3815−0.05930.35000.059*
O6W0.6987 (8)0.0165 (5)0.0785 (4)0.0404 (13)
H12W0.7395−0.04810.12210.061*
H11W0.57690.05070.10040.061*
O7W0.5026 (8)0.1541 (5)0.4139 (5)0.0472 (14)
H13W0.50430.21270.36070.071*
H14W0.46950.17860.47570.071*
O8W0.5118 (8)0.3188 (5)0.2216 (5)0.0501 (15)
H15W0.62990.29250.18840.075*
H16W0.47330.39520.20510.075*
O9W0.4165 (9)0.5583 (5)0.1328 (5)0.0547 (16)
H17W0.50890.59650.10590.082*
H18W0.30980.59020.10380.082*
O10W0.2113 (8)0.7246 (5)0.2679 (4)0.0452 (14)
H20W0.08770.76350.25660.068*
H19W0.29010.77410.26240.068*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Co20.0367 (6)0.0223 (5)0.0290 (5)−0.0043 (4)−0.0046 (4)−0.0024 (4)
O10.047 (3)0.024 (3)0.040 (3)−0.007 (2)−0.002 (3)−0.001 (2)
O20.049 (3)0.027 (3)0.041 (3)0.002 (3)0.000 (3)−0.007 (2)
O30.039 (3)0.044 (3)0.033 (3)−0.008 (3)−0.001 (2)0.009 (3)
O40.037 (3)0.049 (3)0.038 (3)−0.010 (3)−0.014 (2)0.011 (3)
N10.038 (3)0.022 (3)0.025 (3)−0.003 (3)−0.005 (3)−0.002 (3)
N20.049 (4)0.029 (3)0.020 (3)−0.004 (3)0.000 (3)0.000 (3)
C10.032 (4)0.014 (3)0.033 (4)0.000 (3)−0.006 (3)−0.004 (3)
C20.033 (4)0.018 (4)0.029 (4)−0.006 (3)−0.011 (3)0.004 (3)
C30.040 (4)0.025 (4)0.023 (4)−0.006 (3)−0.006 (3)−0.005 (3)
C40.032 (4)0.009 (3)0.032 (4)0.002 (3)−0.003 (3)−0.003 (3)
C50.042 (4)0.017 (3)0.016 (3)−0.004 (3)−0.004 (3)0.000 (3)
C60.044 (4)0.028 (4)0.026 (4)−0.008 (3)−0.003 (3)−0.008 (3)
C70.034 (4)0.026 (4)0.034 (4)0.001 (3)−0.010 (3)−0.002 (3)
C80.037 (4)0.026 (4)0.033 (4)−0.008 (3)−0.008 (3)−0.006 (3)
C90.042 (4)0.018 (4)0.030 (4)0.000 (3)−0.004 (3)0.000 (3)
O1W0.042 (3)0.032 (3)0.035 (3)−0.011 (2)−0.007 (2)0.002 (2)
O2W0.042 (3)0.034 (3)0.030 (3)−0.013 (2)−0.008 (2)0.002 (2)
O3W0.080 (4)0.029 (3)0.042 (3)−0.007 (3)0.004 (3)−0.009 (3)
O4W0.047 (3)0.025 (3)0.039 (3)−0.009 (2)−0.005 (2)−0.006 (2)
O5W0.043 (3)0.021 (3)0.050 (3)0.004 (2)−0.014 (3)−0.006 (2)
O6W0.038 (3)0.034 (3)0.043 (3)0.002 (2)−0.007 (2)−0.005 (3)
O7W0.055 (4)0.045 (3)0.042 (3)−0.006 (3)−0.007 (3)−0.013 (3)
O8W0.050 (3)0.039 (3)0.061 (4)−0.008 (3)−0.012 (3)−0.006 (3)
O9W0.044 (3)0.045 (4)0.070 (4)−0.010 (3)−0.009 (3)0.001 (3)
O10W0.049 (3)0.048 (4)0.040 (3)−0.015 (3)−0.010 (3)−0.001 (3)
Geometric parameters (Å, °) top
Co2—O3W2.068 (5)C5—C61.384 (9)
Co2—O5W2.082 (5)C6—H60.9300
Co2—N12.096 (6)C9—H90.9300
Co2—O1W2.104 (5)O1W—H1W0.8400
Co2—O2W2.109 (5)O1W—H2W0.8401
Co2—O4W2.141 (5)O2W—H4W0.8400
O1—C71.250 (8)O2W—H3W0.8400
O2—C71.259 (9)O3W—H5W0.8400
O3—C81.255 (8)O3W—H6W0.8400
O4—C81.239 (8)O4W—H7W0.8401
N1—C91.328 (9)O4W—H8W0.8401
N1—C41.401 (8)O5W—H9W0.8400
N2—C91.330 (9)O5W—H10W0.8400
N2—C51.380 (8)O6W—H12W0.8400
N2—H20.8600O6W—H11W0.8400
C1—C61.383 (9)O7W—H13W0.8400
C1—C21.419 (10)O7W—H14W0.8400
C1—C71.503 (9)O8W—H15W0.8400
C2—C31.376 (9)O8W—H16W0.8400
C2—C81.522 (9)O9W—H17W0.8400
C3—C41.394 (9)O9W—H18W0.8400
C3—H30.9300O10W—H20W0.8708
C4—C51.392 (9)O10W—H19W0.8660
O3W—Co2—O5W88.5 (2)N2—C5—C4105.4 (6)
O3W—Co2—N1175.5 (2)C6—C5—C4122.0 (6)
O5W—Co2—N187.0 (2)C1—C6—C5117.9 (6)
O3W—Co2—O1W90.5 (2)C1—C6—H6121.0
O5W—Co2—O1W177.2 (2)C5—C6—H6121.0
N1—Co2—O1W94.1 (2)O1—C7—O2124.7 (7)
O3W—Co2—O2W86.2 (2)O1—C7—C1117.8 (6)
O5W—Co2—O2W93.4 (2)O2—C7—C1117.3 (6)
N1—Co2—O2W94.0 (2)O4—C8—O3125.3 (7)
O1W—Co2—O2W89.15 (19)O4—C8—C2117.0 (6)
O3W—Co2—O4W90.0 (2)O3—C8—C2117.5 (6)
O5W—Co2—O4W89.0 (2)N1—C9—N2113.4 (6)
N1—Co2—O4W90.0 (2)N1—C9—H9123.3
O1W—Co2—O4W88.33 (19)N2—C9—H9123.3
O2W—Co2—O4W175.4 (2)Co2—O1W—H1W119.1
C9—N1—C4104.2 (6)Co2—O1W—H2W115.2
C9—N1—Co2122.8 (5)H1W—O1W—H2W111.5
C4—N1—Co2132.5 (4)Co2—O2W—H4W110.6
C9—N2—C5107.7 (6)Co2—O2W—H3W120.7
C9—N2—H2126.2H4W—O2W—H3W111.6
C5—N2—H2126.2Co2—O3W—H5W123.9
C6—C1—C2120.1 (6)Co2—O3W—H6W122.3
C6—C1—C7119.0 (6)H5W—O3W—H6W112.1
C2—C1—C7120.8 (6)Co2—O4W—H7W101.5
C3—C2—C1121.6 (6)Co2—O4W—H8W116.2
C3—C2—C8117.0 (6)H7W—O4W—H8W110.5
C1—C2—C8121.3 (6)Co2—O5W—H9W102.5
C2—C3—C4117.8 (6)Co2—O5W—H10W123.2
C2—C3—H3121.1H9W—O5W—H10W111.2
C4—C3—H3121.1H12W—O6W—H11W111.4
C5—C4—C3120.5 (6)H13W—O7W—H14W111.5
C5—C4—N1109.3 (6)H15W—O8W—H16W111.6
C3—C4—N1130.2 (6)H17W—O9W—H18W111.6
N2—C5—C6132.6 (6)H20W—O10W—H19W112.0
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N2—H2···O10Wi0.861.992.822 (8)162
O1W—H1W···O3ii0.841.782.603 (7)169
O1W—H2W···O6Wiii0.841.952.789 (9)175
O2W—H4W···O8W0.841.902.726 (9)165
O2W—H3W···O4ii0.841.782.614 (7)173
O3W—H5W···O10Wiv0.841.932.752 (8)167
O3W—H6W···O6Wv0.841.922.758 (8)177
O4W—H7W···O7Wiii0.842.052.827 (7)154
O4W—H8W···O1iv0.841.962.801 (8)176
O5W—H9W···O7W0.841.922.734 (9)162
O5W—H10W···O2vi0.841.882.700 (7)164
O6W—H12W···O1vi0.841.982.812 (6)171
O6W—H11W···O2W0.842.062.865 (6)161
O7W—H13W···O8W0.841.892.721 (8)168
O7W—H14W···O2i0.841.912.737 (8)168
O8W—H15W···O1Wvii0.842.052.860 (7)163
O8W—H16W···O9W0.841.882.699 (7)166
O9W—H17W···O4vii0.841.932.766 (9)172
O9W—H18W···O30.841.932.771 (8)175
O10W—H20W···O10.871.892.747 (7)168
O10W—H19W···O2vii0.872.543.191 (9)133
Symmetry codes: (i) −x, −y+1, −z+1; (ii) −x, −y+1, −z; (iii) x−1, y, z; (iv) x, y−1, z; (v) −x+1, −y, −z; (vi) x+1, y−1, z; (vii) x+1, y, z.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N2—H2···O10Wi0.861.992.822 (8)162
O1W—H1W···O3ii0.841.782.603 (7)169
O1W—H2W···O6Wiii0.841.952.789 (9)175
O2W—H4W···O8W0.841.902.726 (9)165
O2W—H3W···O4ii0.841.782.614 (7)173
O3W—H5W···O10Wiv0.841.932.752 (8)167
O3W—H6W···O6Wv0.841.922.758 (8)177
O4W—H7W···O7Wiii0.842.052.827 (7)154
O4W—H8W···O1iv0.841.962.801 (8)176
O5W—H9W···O7W0.841.922.734 (9)162
O5W—H10W···O2vi0.841.882.700 (7)164
O6W—H12W···O1vi0.841.982.812 (6)171
O6W—H11W···O2W0.842.062.865 (6)161
O7W—H13W···O8W0.841.892.721 (8)168
O7W—H14W···O2i0.841.912.737 (8)168
O8W—H15W···O1Wvii0.842.052.860 (7)163
O8W—H16W···O9W0.841.882.699 (7)166
O9W—H17W···O4vii0.841.932.766 (9)172
O9W—H18W···O30.841.932.771 (8)175
O10W—H20W···O10.871.892.747 (7)168
O10W—H19W···O2vii0.872.543.191 (9)133
Symmetry codes: (i) −x, −y+1, −z+1; (ii) −x, −y+1, −z; (iii) x−1, y, z; (iv) x, y−1, z; (v) −x+1, −y, −z; (vi) x+1, y−1, z; (vii) x+1, y, z.
Acknowledgements top

The authors acknowledge Guang Dong Ocean University for support of this work.

references
References top

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