Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807040275/bg2090sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807040275/bg2090Isup2.hkl |
CCDC reference: 1283853
A mixture of cobalt chloride (1 mmol), pyridine-3,4-dicarboxylic acid (1 mmol) and 2,2-bipyridine (2 mmol) in a 1:1 solvent mixture of H2O and ethanol was kept at 473 K for 10 d in a 25 ml Teflon-lined stainless steel autoclave. Red crystals were obtained after cooling to room temperature (yield 22%). Analysis calculated for C17H15CoN3O6: C 49.04, H 3.61, N 10.12%; found: C 48.89, H 3.41, N 10.06%.
The H atoms of the water molecule were located from difference density maps and were refined with distance restraints of H···H = 1.38 (2)Å and O—H = 0.88 (2) Å, and with a fixed Uiso(H) value of 0.80 Å2. All other H atoms were placed in calculated positions, with C—H = 0.93Å and Uiso(H) = 1.2Ueq of the respective carrier atom.
Complexes containing carboxyl acids have been the interest of chemists these years due to their potential applications, such as catalysis, optics, information storage, medicine, molecular electrochemistry, biochemistry and biological pharmaceutics (Li et al., 1993; Gao et al., 2004; Go et al., 2004). Thus far, N-containing aromatic carboxyl acid has been widely used in dye intermediates, organic synthesis, sensitization materials, functional pigments, etc. (An et al., 2000). Pyridinecarboxylic acid is also a good ligand in coordination chemistry due to its strong coordination ability and versatile coordination modes for what it has received much attention it in recent decades (Baroni et al., 1996; Hundal et al., 2002)).
Herein, we report a new complex containing both ligands, namely poly[[aqua(2,2-bipyridine)(µ3-pyridine-3,4-dicarboxylato)cobalt(II)] monohydrate], (I).
The structure of (I) contains one cobalt cation chelated by one 2,2'-bipyridine ligand and further coordinated by two monodentate carboxylate groups and one N atom belonging to three-symmetry related pyridine-3,4-dicarboxylate ligands (acting in a µ3-N:O:O' mode) and one water molecule. There is also a crystallization weater molecule. The result is a CoO3N3 polyhedron which exhibits an octahedral geometry (Fig. 1).
The CoII atom is hexa-coordinated by three N and three O atoms exhibiting an octahedral geometry. Each two neighboring CoII cations are bridged by two independent pyridine-3,4-dicarboxylate ligands, which are further coordinated to the third and the fourth CoII cations though pyridine N atom to form corrugated layers parallel to the [110] plane (Fig. 2). There exist two medium–strong intramolecular hydrogen bonds involving the coordinated water molecule (Table 3, first and second entries) and two intermolecular hydrogen bonds (Table 3, third and fourth entries) wher the crystallization water takes part, linking layers into a three-dimensional packing network (Fig. 3).
For related literature, see: Li et al. (1993); Gao et al. (2004); Go et al. (2004); An et al. (2000); Baroni et al. (1996); Hundal et al. (2002).
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2001); software used to prepare material for publication: SHELXTL.
[Co(C7H3NO4)(C10H8N2)(H2O)]·H2O | F(000) = 1704 |
Mr = 416.25 | Dx = 1.671 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 3249 reflections |
a = 15.7498 (5) Å | θ = 2.4–26.2° |
b = 12.3488 (10) Å | µ = 1.08 mm−1 |
c = 17.0168 (5) Å | T = 293 K |
V = 3309.6 (3) Å3 | Block, red |
Z = 8 | 0.43 × 0.36 × 0.23 mm |
Bruker APEXII CCD area-detector diffractometer | 3249 independent reflections |
Radiation source: fine-focus sealed tube | 2562 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.073 |
φ and ω scans | θmax = 26.2°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | h = −19→19 |
Tmin = 0.654, Tmax = 0.789 | k = −15→15 |
26510 measured reflections | l = −20→20 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.163 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.119P)2 + 0.8076P] where P = (Fo2 + 2Fc2)/3 |
3249 reflections | (Δ/σ)max = 0.006 |
256 parameters | Δρmax = 0.60 e Å−3 |
6 restraints | Δρmin = −1.07 e Å−3 |
[Co(C7H3NO4)(C10H8N2)(H2O)]·H2O | V = 3309.6 (3) Å3 |
Mr = 416.25 | Z = 8 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 15.7498 (5) Å | µ = 1.08 mm−1 |
b = 12.3488 (10) Å | T = 293 K |
c = 17.0168 (5) Å | 0.43 × 0.36 × 0.23 mm |
Bruker APEXII CCD area-detector diffractometer | 3249 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | 2562 reflections with I > 2σ(I) |
Tmin = 0.654, Tmax = 0.789 | Rint = 0.073 |
26510 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 6 restraints |
wR(F2) = 0.163 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 0.60 e Å−3 |
3249 reflections | Δρmin = −1.07 e Å−3 |
256 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 | ||
C1 | 0.1666 (2) | 0.5122 (2) | 0.05468 (19) | 0.0207 (7) | |
C2 | 0.20645 (19) | 0.6010 (2) | 0.00657 (18) | 0.0193 (6) | |
C3 | 0.1814 (2) | 0.6283 (3) | −0.07012 (18) | 0.0209 (7) | |
C4 | 0.2242 (2) | 0.7129 (3) | −0.1059 (2) | 0.0280 (8) | |
H4 | 0.2089 | 0.7350 | −0.1562 | 0.034* | |
C5 | 0.2905 (2) | 0.7654 (3) | −0.0662 (2) | 0.0292 (8) | |
H5 | 0.3177 | 0.8225 | −0.0914 | 0.035* | |
C6 | 0.2742 (2) | 0.6578 (3) | 0.04070 (19) | 0.0222 (7) | |
H6 | 0.2906 | 0.6382 | 0.0913 | 0.027* | |
C7 | 0.1153 (2) | 0.5687 (3) | −0.11957 (18) | 0.0228 (7) | |
C8 | −0.0243 (2) | 0.2994 (3) | −0.1028 (2) | 0.0300 (8) | |
H8 | 0.0076 | 0.3616 | −0.1116 | 0.036* | |
C9 | −0.0764 (3) | 0.2621 (3) | −0.1624 (2) | 0.0384 (9) | |
H9 | −0.0793 | 0.2986 | −0.2101 | 0.046* | |
C10 | −0.1235 (3) | 0.1708 (3) | −0.1501 (2) | 0.0393 (9) | |
H10 | −0.1583 | 0.1435 | −0.1896 | 0.047* | |
C11 | −0.1186 (2) | 0.1197 (3) | −0.0777 (2) | 0.0310 (8) | |
H11 | −0.1514 | 0.0585 | −0.0679 | 0.037* | |
C12 | −0.06399 (19) | 0.1603 (3) | −0.0191 (2) | 0.0220 (7) | |
C13 | −0.0539 (2) | 0.1084 (3) | 0.0589 (2) | 0.0228 (7) | |
C14 | −0.1060 (3) | 0.0249 (3) | 0.0844 (2) | 0.0395 (10) | |
H14 | −0.1502 | 0.0008 | 0.0527 | 0.047* | |
C15 | −0.0923 (3) | −0.0224 (3) | 0.1569 (2) | 0.0419 (10) | |
H15 | −0.1268 | −0.0789 | 0.1738 | 0.050* | |
C16 | −0.0271 (2) | 0.0148 (3) | 0.2043 (2) | 0.0330 (8) | |
H16 | −0.0160 | −0.0162 | 0.2531 | 0.040* | |
C17 | 0.0208 (2) | 0.0998 (3) | 0.1760 (2) | 0.0302 (8) | |
H17 | 0.0643 | 0.1262 | 0.2076 | 0.036* | |
Co1 | 0.06154 (3) | 0.31049 (4) | 0.06880 (3) | 0.0275 (2) | |
H1W | 0.171 (2) | 0.264 (3) | 0.190 (4) | 0.080* | |
H2W | 0.162 (3) | 0.367 (2) | 0.166 (3) | 0.080* | |
H3W | 0.262 (3) | 0.107 (3) | 0.204 (2) | 0.080* | |
H4W | 0.211 (3) | 0.098 (3) | 0.269 (2) | 0.080* | |
N1 | 0.00877 (17) | 0.1467 (2) | 0.10612 (17) | 0.0235 (6) | |
N2 | −0.01773 (16) | 0.2498 (2) | −0.03249 (17) | 0.0225 (6) | |
N3 | 0.31687 (17) | 0.7377 (2) | 0.00600 (17) | 0.0256 (6) | |
O1 | 0.13691 (16) | 0.31271 (19) | 0.18065 (16) | 0.0300 (6) | |
O2 | 0.19348 (18) | 0.4987 (2) | 0.12382 (14) | 0.0342 (6) | |
O3 | 0.11008 (14) | 0.45667 (17) | 0.02123 (14) | 0.0261 (5) | |
O4 | 0.14178 (17) | 0.4916 (2) | −0.15898 (15) | 0.0367 (6) | |
O5 | 0.04092 (15) | 0.6062 (2) | −0.12210 (15) | 0.0331 (6) | |
O6 | 0.23530 (18) | 0.13852 (19) | 0.23886 (15) | 0.0344 (6) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0205 (15) | 0.0129 (15) | 0.0286 (18) | 0.0010 (12) | 0.0011 (13) | −0.0004 (12) |
C2 | 0.0196 (15) | 0.0138 (14) | 0.0245 (16) | −0.0005 (11) | 0.0047 (12) | −0.0019 (12) |
C3 | 0.0175 (15) | 0.0186 (16) | 0.0266 (17) | 0.0033 (12) | 0.0029 (12) | −0.0012 (12) |
C4 | 0.0306 (18) | 0.0268 (17) | 0.0265 (18) | 0.0000 (14) | −0.0033 (15) | 0.0069 (14) |
C5 | 0.0284 (18) | 0.0232 (18) | 0.036 (2) | −0.0078 (14) | 0.0013 (14) | 0.0074 (14) |
C6 | 0.0258 (16) | 0.0204 (15) | 0.0204 (16) | 0.0005 (13) | 0.0005 (13) | 0.0010 (13) |
C7 | 0.0262 (17) | 0.0248 (17) | 0.0174 (16) | 0.0004 (13) | 0.0025 (13) | 0.0039 (13) |
C8 | 0.0288 (18) | 0.0287 (19) | 0.032 (2) | −0.0021 (14) | 0.0022 (16) | 0.0076 (14) |
C9 | 0.040 (2) | 0.044 (2) | 0.032 (2) | 0.0019 (18) | −0.0035 (17) | 0.0126 (17) |
C10 | 0.036 (2) | 0.044 (2) | 0.039 (2) | −0.0031 (17) | −0.0118 (18) | 0.0000 (18) |
C11 | 0.0318 (19) | 0.0277 (18) | 0.033 (2) | −0.0084 (15) | −0.0068 (15) | −0.0010 (14) |
C12 | 0.0192 (16) | 0.0209 (16) | 0.0259 (17) | 0.0003 (12) | −0.0003 (13) | −0.0024 (13) |
C13 | 0.0230 (16) | 0.0170 (16) | 0.0283 (18) | −0.0017 (12) | 0.0013 (13) | −0.0034 (13) |
C14 | 0.042 (2) | 0.040 (2) | 0.036 (2) | −0.0248 (18) | −0.0082 (18) | 0.0037 (17) |
C15 | 0.051 (2) | 0.036 (2) | 0.038 (2) | −0.0213 (19) | 0.0000 (19) | 0.0064 (17) |
C16 | 0.041 (2) | 0.0277 (19) | 0.030 (2) | −0.0039 (15) | 0.0008 (16) | 0.0067 (15) |
C17 | 0.0304 (18) | 0.0310 (19) | 0.0291 (19) | −0.0062 (15) | −0.0038 (15) | 0.0003 (15) |
Co1 | 0.0275 (3) | 0.0217 (3) | 0.0335 (3) | −0.00239 (18) | −0.00134 (19) | −0.00001 (18) |
N1 | 0.0212 (14) | 0.0225 (14) | 0.0267 (15) | −0.0033 (11) | −0.0012 (11) | 0.0028 (11) |
N2 | 0.0211 (13) | 0.0201 (14) | 0.0263 (15) | −0.0007 (11) | 0.0010 (11) | −0.0001 (11) |
N3 | 0.0230 (14) | 0.0219 (14) | 0.0319 (16) | −0.0042 (11) | −0.0008 (12) | 0.0006 (12) |
O1 | 0.0341 (14) | 0.0238 (13) | 0.0320 (14) | −0.0035 (10) | −0.0030 (11) | 0.0005 (10) |
O2 | 0.0483 (15) | 0.0269 (13) | 0.0275 (14) | −0.0137 (11) | −0.0074 (11) | 0.0062 (10) |
O3 | 0.0278 (12) | 0.0188 (11) | 0.0317 (13) | −0.0065 (10) | −0.0014 (10) | 0.0036 (9) |
O4 | 0.0418 (15) | 0.0306 (14) | 0.0377 (15) | 0.0108 (11) | −0.0022 (12) | −0.0153 (11) |
O5 | 0.0226 (12) | 0.0382 (15) | 0.0386 (15) | 0.0090 (11) | −0.0040 (11) | −0.0099 (12) |
O6 | 0.0443 (16) | 0.0290 (13) | 0.0299 (14) | −0.0006 (12) | 0.0059 (12) | −0.0001 (11) |
C1—O3 | 1.259 (4) | C12—N2 | 1.343 (4) |
C1—O2 | 1.262 (4) | C12—C13 | 1.483 (5) |
C1—C2 | 1.506 (4) | C13—N1 | 1.358 (4) |
C2—C6 | 1.403 (4) | C13—C14 | 1.387 (5) |
C2—C3 | 1.404 (5) | C14—C15 | 1.382 (6) |
C3—C4 | 1.384 (5) | C14—H14 | 0.9300 |
C3—C7 | 1.527 (4) | C15—C16 | 1.384 (6) |
C4—C5 | 1.402 (5) | C15—H15 | 0.9300 |
C4—H4 | 0.9300 | C16—C17 | 1.380 (5) |
C5—N3 | 1.342 (5) | C16—H16 | 0.9300 |
C5—H5 | 0.9300 | C17—N1 | 1.336 (5) |
C6—N3 | 1.332 (4) | C17—H17 | 0.9300 |
C6—H6 | 0.9300 | Co1—O5i | 2.118 (2) |
C7—O4 | 1.237 (4) | Co1—O3 | 2.121 (2) |
C7—O5 | 1.261 (4) | Co1—O1 | 2.243 (3) |
C8—N2 | 1.348 (5) | Co1—N2 | 2.256 (3) |
C8—C9 | 1.383 (6) | Co1—N1 | 2.276 (3) |
C8—H8 | 0.9300 | Co1—N3ii | 2.370 (3) |
C9—C10 | 1.365 (6) | N3—Co1iii | 2.370 (3) |
C9—H9 | 0.9300 | O1—H1W | 0.82 (4) |
C10—C11 | 1.386 (5) | O1—H2W | 0.82 (3) |
C10—H10 | 0.9300 | O5—Co1i | 2.118 (2) |
C11—C12 | 1.410 (5) | O6—H3W | 0.83 (4) |
C11—H11 | 0.9300 | O6—H4W | 0.81 (4) |
O3—C1—O2 | 125.9 (3) | C13—C14—H14 | 119.9 |
O3—C1—C2 | 116.5 (3) | C14—C15—C16 | 119.7 (3) |
O2—C1—C2 | 117.6 (3) | C14—C15—H15 | 120.1 |
C6—C2—C3 | 118.6 (3) | C16—C15—H15 | 120.1 |
C6—C2—C1 | 117.1 (3) | C17—C16—C15 | 117.0 (3) |
C3—C2—C1 | 124.2 (3) | C17—C16—H16 | 121.5 |
C4—C3—C2 | 116.9 (3) | C15—C16—H16 | 121.5 |
C4—C3—C7 | 116.9 (3) | N1—C17—C16 | 124.3 (3) |
C2—C3—C7 | 126.0 (3) | N1—C17—H17 | 117.9 |
C3—C4—C5 | 120.0 (3) | C16—C17—H17 | 117.9 |
C3—C4—H4 | 120.0 | O5i—Co1—O3 | 91.41 (10) |
C5—C4—H4 | 120.0 | O5i—Co1—O1 | 91.94 (10) |
N3—C5—C4 | 123.6 (3) | O3—Co1—O1 | 97.05 (9) |
N3—C5—H5 | 118.2 | O5i—Co1—N2 | 93.83 (9) |
C4—C5—H5 | 118.2 | O3—Co1—N2 | 100.98 (9) |
N3—C6—C2 | 124.8 (3) | O1—Co1—N2 | 160.91 (9) |
N3—C6—H6 | 117.6 | O5i—Co1—N1 | 91.94 (10) |
C2—C6—H6 | 117.6 | O3—Co1—N1 | 173.73 (10) |
O4—C7—O5 | 125.3 (3) | O1—Co1—N1 | 88.13 (9) |
O4—C7—C3 | 116.1 (3) | N2—Co1—N1 | 73.52 (10) |
O5—C7—C3 | 118.4 (3) | O5i—Co1—N3ii | 173.23 (10) |
N2—C8—C9 | 123.0 (3) | O3—Co1—N3ii | 81.93 (9) |
N2—C8—H8 | 118.5 | O1—Co1—N3ii | 87.68 (10) |
C9—C8—H8 | 118.5 | N2—Co1—N3ii | 88.67 (10) |
C10—C9—C8 | 119.0 (4) | N1—Co1—N3ii | 94.80 (10) |
C10—C9—H9 | 120.5 | C17—N1—C13 | 118.6 (3) |
C8—C9—H9 | 120.5 | C17—N1—Co1 | 125.6 (2) |
C9—C10—C11 | 118.8 (4) | C13—N1—Co1 | 114.2 (2) |
C9—C10—H10 | 120.6 | C12—N2—C8 | 118.9 (3) |
C11—C10—H10 | 120.6 | C12—N2—Co1 | 116.3 (2) |
C10—C11—C12 | 120.0 (3) | C8—N2—Co1 | 124.7 (2) |
C10—C11—H11 | 120.0 | C6—N3—C5 | 116.0 (3) |
C12—C11—H11 | 120.0 | C6—N3—Co1iii | 119.3 (2) |
N2—C12—C11 | 120.3 (3) | C5—N3—Co1iii | 124.5 (2) |
N2—C12—C13 | 116.7 (3) | Co1—O1—H1W | 120 (4) |
C11—C12—C13 | 123.0 (3) | Co1—O1—H2W | 90 (4) |
N1—C13—C14 | 120.3 (3) | H1W—O1—H2W | 110 (3) |
N1—C13—C12 | 117.2 (3) | C1—O3—Co1 | 123.1 (2) |
C14—C13—C12 | 122.6 (3) | C7—O5—Co1i | 150.7 (2) |
C15—C14—C13 | 120.1 (3) | H3W—O6—H4W | 113 (3) |
C15—C14—H14 | 119.9 |
Symmetry codes: (i) −x, −y+1, −z; (ii) −x+1/2, y−1/2, z; (iii) −x+1/2, y+1/2, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1W···O6 | 0.82 (4) | 2.03 (4) | 2.830 (4) | 165 (5) |
O1—H2W···O2 | 0.82 (3) | 1.84 (2) | 2.646 (3) | 166 (5) |
O6—H3W···O2ii | 0.83 (4) | 2.04 (4) | 2.841 (3) | 166 (5) |
O6—H4W···O4iv | 0.81 (4) | 1.98 (4) | 2.788 (3) | 174 (5) |
Symmetry codes: (ii) −x+1/2, y−1/2, z; (iv) x, −y+1/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | [Co(C7H3NO4)(C10H8N2)(H2O)]·H2O |
Mr | 416.25 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 293 |
a, b, c (Å) | 15.7498 (5), 12.3488 (10), 17.0168 (5) |
V (Å3) | 3309.6 (3) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 1.08 |
Crystal size (mm) | 0.43 × 0.36 × 0.23 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2001) |
Tmin, Tmax | 0.654, 0.789 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 26510, 3249, 2562 |
Rint | 0.073 |
(sin θ/λ)max (Å−1) | 0.622 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.163, 1.00 |
No. of reflections | 3249 |
No. of parameters | 256 |
No. of restraints | 6 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.60, −1.07 |
Computer programs: APEX2 (Bruker, 2004), SAINT-Plus (Bruker, 2001), SAINT-Plus, SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL (Bruker, 2001), SHELXTL.
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1W···O6 | 0.82 (4) | 2.03 (4) | 2.830 (4) | 165 (5) |
O1—H2W···O2 | 0.82 (3) | 1.839 (15) | 2.646 (3) | 166 (5) |
O6—H3W···O2i | 0.83 (4) | 2.04 (4) | 2.841 (3) | 166 (5) |
O6—H4W···O4ii | 0.81 (4) | 1.98 (4) | 2.788 (3) | 174 (5) |
Symmetry codes: (i) −x+1/2, y−1/2, z; (ii) x, −y+1/2, z+1/2. |
Complexes containing carboxyl acids have been the interest of chemists these years due to their potential applications, such as catalysis, optics, information storage, medicine, molecular electrochemistry, biochemistry and biological pharmaceutics (Li et al., 1993; Gao et al., 2004; Go et al., 2004). Thus far, N-containing aromatic carboxyl acid has been widely used in dye intermediates, organic synthesis, sensitization materials, functional pigments, etc. (An et al., 2000). Pyridinecarboxylic acid is also a good ligand in coordination chemistry due to its strong coordination ability and versatile coordination modes for what it has received much attention it in recent decades (Baroni et al., 1996; Hundal et al., 2002)).
Herein, we report a new complex containing both ligands, namely poly[[aqua(2,2-bipyridine)(µ3-pyridine-3,4-dicarboxylato)cobalt(II)] monohydrate], (I).
The structure of (I) contains one cobalt cation chelated by one 2,2'-bipyridine ligand and further coordinated by two monodentate carboxylate groups and one N atom belonging to three-symmetry related pyridine-3,4-dicarboxylate ligands (acting in a µ3-N:O:O' mode) and one water molecule. There is also a crystallization weater molecule. The result is a CoO3N3 polyhedron which exhibits an octahedral geometry (Fig. 1).
The CoII atom is hexa-coordinated by three N and three O atoms exhibiting an octahedral geometry. Each two neighboring CoII cations are bridged by two independent pyridine-3,4-dicarboxylate ligands, which are further coordinated to the third and the fourth CoII cations though pyridine N atom to form corrugated layers parallel to the [110] plane (Fig. 2). There exist two medium–strong intramolecular hydrogen bonds involving the coordinated water molecule (Table 3, first and second entries) and two intermolecular hydrogen bonds (Table 3, third and fourth entries) wher the crystallization water takes part, linking layers into a three-dimensional packing network (Fig. 3).