metal-organic compounds
Poly[[aquabis[μ2-6-(pyridine-3-carboxamido)naphthalene-2-carboxylato]copper(II)] dihydrate]
aDepartment of Chemistry (BK21), Sungkyunkwan University, Natural Science Campus, Suwon 440-746, Republic of Korea
*Correspondence e-mail: soonwlee@skku.edu
The title compound, {[Cu(C17H11N2O3)2(H2O)]·2H2O}n, is a two-dimensional polymer. The Cu2+ ion lies on the crystallographic twofold axis. The coordination sphere of the Cu2+ ion can be described as a distorted square pyramid. All of the H atoms in the amide group and lattice water molecules participate in O—H⋯O or N—H⋯O hydrogen bonding to strengthen the two-dimensioal framework of the polymer.
Related literature
For coordination polymers based on linking ligands with O- and N-donor atoms, see: Robin & Fromm (2006). For d–f coordination polymers based on linking ligands with pyridyl–carboxylate terminal ligands, see: Hu et al. (2012); Chen et al. (2010); Tang et al. (2010); Yue et al. (2011); Zhu et al. (2010). For related potential linking ligands, see: Han & Lee (2012); Zheng & Lee (2012). For the ligand used for the preparation of the title compound, see: Song & Lee (2012).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Bruker, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
10.1107/S1600536812044157/aa2070sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812044157/aa2070Isup2.hkl
A mixture of Cu(NO3)2.3H2O (48.3 mg, 0.2 mmol) and 6-(nicotinamido)-2-naphthoic acid (58.4 mg, 0.2 mmol) in H2O (20 ml) was sealed in a 24 ml Teflon-lined vessel. The reaction mixture was heated 150 °C for 72 h and then slowly air-cooled to room temperature for 24 h. The resulting green crystals were isolated by filtration, washed by methanol (10 ml × 3), and then air-dried to give the title compound (19 mg, 0.027 mmol, 27% yield). mp: 586–589 K. IR (KBr, cm-1): 3474 (w), 2897 (w), 2633 (w), 2383 (w), 2298 (w), 2084 (w), 1805 (w), 1660 (m), 1580 (m), 1483 (m), 1353 (m), 1204 (w), 1108 (w), 1049 (w), 951 (w), 886 (w), 824 (w), 772 (w), 749 (w), 702 (w), 625 (w), 457 (w).
C-bound H atoms were positioned geometrically [C—H = 0.93 Å] and allowed to ride on their parent atoms, with Uiso(H) = 1.2Ueq(C). H-atoms participating in the H-bonds were located in a difference Fourier map and refined freely.
Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Bruker, 2008); software used to prepare material for publication: SHELXTL (Bruker, 2008).[Cu(C17H11N2O3)2(H2O)]·2H2O | F(000) = 1444 |
Mr = 700.14 | Dx = 1.549 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 3663 reflections |
a = 29.6255 (8) Å | θ = 2.8–26.3° |
b = 6.8582 (2) Å | µ = 0.79 mm−1 |
c = 14.8264 (4) Å | T = 296 K |
β = 94.728 (3)° | Block, green |
V = 3002.14 (14) Å3 | 0.18 × 0.16 × 0.16 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 3705 independent reflections |
Radiation source: sealed tube | 2462 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.071 |
ϕ and ω scans | θmax = 28.3°, θmin = 1.4° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −38→39 |
Tmin = 0.870, Tmax = 0.884 | k = −9→8 |
24367 measured reflections | l = −19→19 |
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)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.095 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.0323P)2 + 3.3539P] where P = (Fo2 + 2Fc2)/3 |
3705 reflections | (Δ/σ)max < 0.001 |
234 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.28 e Å−3 |
[Cu(C17H11N2O3)2(H2O)]·2H2O | V = 3002.14 (14) Å3 |
Mr = 700.14 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 29.6255 (8) Å | µ = 0.79 mm−1 |
b = 6.8582 (2) Å | T = 296 K |
c = 14.8264 (4) Å | 0.18 × 0.16 × 0.16 mm |
β = 94.728 (3)° |
Bruker APEXII CCD diffractometer | 3705 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2462 reflections with I > 2σ(I) |
Tmin = 0.870, Tmax = 0.884 | Rint = 0.071 |
24367 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.095 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 0.31 e Å−3 |
3705 reflections | Δρmin = −0.28 e Å−3 |
234 parameters |
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 > 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 | ||
Cu1 | 0.5000 | 0.15958 (7) | 0.7500 | 0.02730 (14) | |
O1 | 0.43940 (5) | 0.1123 (3) | 0.69567 (11) | 0.0339 (5) | |
O2 | 0.43602 (6) | −0.1766 (3) | 0.76371 (12) | 0.0404 (5) | |
O3 | 0.14263 (6) | 0.0207 (3) | 0.50325 (12) | 0.0388 (5) | |
O4 | 0.5000 | 0.5226 (5) | 0.7500 | 0.0458 (8) | |
O5 | 0.11363 (10) | 0.3690 (4) | 0.58013 (19) | 0.0586 (7) | |
N1 | 0.15983 (7) | −0.2657 (4) | 0.57653 (15) | 0.0298 (5) | |
N2 | 0.02186 (6) | −0.2919 (3) | 0.62447 (13) | 0.0248 (5) | |
C1 | 0.41869 (8) | −0.0433 (4) | 0.71535 (16) | 0.0286 (6) | |
C2 | 0.36998 (8) | −0.0565 (4) | 0.67842 (16) | 0.0278 (6) | |
C3 | 0.34545 (8) | −0.2230 (4) | 0.69110 (17) | 0.0315 (6) | |
H3 | 0.3597 | −0.3288 | 0.7207 | 0.038* | |
C4 | 0.29901 (8) | −0.2372 (4) | 0.66017 (16) | 0.0277 (6) | |
C5 | 0.27238 (8) | −0.4042 (4) | 0.67428 (18) | 0.0348 (7) | |
H5 | 0.2857 | −0.5120 | 0.7037 | 0.042* | |
C6 | 0.22799 (8) | −0.4089 (4) | 0.64557 (17) | 0.0337 (6) | |
H6 | 0.2111 | −0.5201 | 0.6555 | 0.040* | |
C7 | 0.20668 (8) | −0.2475 (4) | 0.60056 (16) | 0.0274 (6) | |
C8 | 0.23130 (8) | −0.0832 (4) | 0.58502 (16) | 0.0286 (6) | |
H8 | 0.2174 | 0.0225 | 0.5550 | 0.034* | |
C9 | 0.27774 (8) | −0.0746 (4) | 0.61459 (16) | 0.0269 (6) | |
C10 | 0.30397 (8) | 0.0933 (4) | 0.60178 (18) | 0.0337 (7) | |
H10 | 0.2906 | 0.2001 | 0.5716 | 0.040* | |
C11 | 0.34869 (8) | 0.1023 (4) | 0.63273 (17) | 0.0336 (7) | |
H11 | 0.3652 | 0.2148 | 0.6234 | 0.040* | |
C12 | 0.13114 (8) | −0.1337 (4) | 0.53628 (16) | 0.0268 (6) | |
C13 | 0.08218 (8) | −0.1870 (4) | 0.53737 (16) | 0.0247 (5) | |
C14 | 0.05252 (8) | −0.1765 (4) | 0.45994 (16) | 0.0295 (6) | |
H14 | 0.0624 | −0.1341 | 0.4053 | 0.035* | |
C15 | 0.00809 (9) | −0.2305 (4) | 0.46597 (17) | 0.0329 (7) | |
H15 | −0.0123 | −0.2295 | 0.4147 | 0.040* | |
C16 | −0.00604 (8) | −0.2859 (4) | 0.54859 (16) | 0.0292 (6) | |
H16 | −0.0362 | −0.3207 | 0.5518 | 0.035* | |
C17 | 0.06539 (8) | −0.2429 (4) | 0.61731 (16) | 0.0262 (6) | |
H17 | 0.0852 | −0.2471 | 0.6692 | 0.031* | |
H1 | 0.1478 (10) | −0.368 (5) | 0.588 (2) | 0.055 (11)* | |
H4 | 0.4757 (10) | 0.599 (6) | 0.754 (3) | 0.083 (13)* | |
H51 | 0.1036 (13) | 0.338 (6) | 0.623 (2) | 0.072 (14)* | |
H52 | 0.1223 (14) | 0.273 (7) | 0.561 (3) | 0.088 (17)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cu1 | 0.0144 (2) | 0.0424 (3) | 0.0249 (2) | 0.000 | 0.00091 (16) | 0.000 |
O1 | 0.0186 (8) | 0.0527 (14) | 0.0301 (9) | −0.0109 (9) | 0.0001 (7) | 0.0015 (9) |
O2 | 0.0268 (9) | 0.0467 (14) | 0.0464 (11) | 0.0048 (10) | −0.0051 (8) | 0.0007 (10) |
O3 | 0.0274 (10) | 0.0329 (12) | 0.0565 (12) | −0.0030 (9) | 0.0062 (9) | 0.0119 (10) |
O4 | 0.052 (2) | 0.032 (2) | 0.0547 (19) | 0.000 | 0.0111 (16) | 0.000 |
O5 | 0.0766 (18) | 0.0398 (17) | 0.0638 (17) | −0.0107 (13) | 0.0319 (14) | −0.0065 (13) |
N1 | 0.0185 (11) | 0.0281 (14) | 0.0426 (13) | −0.0052 (11) | 0.0013 (9) | 0.0033 (11) |
N2 | 0.0186 (10) | 0.0288 (14) | 0.0269 (10) | 0.0003 (9) | 0.0015 (8) | −0.0006 (9) |
C1 | 0.0190 (12) | 0.0431 (19) | 0.0237 (12) | −0.0003 (13) | 0.0028 (10) | −0.0078 (12) |
C2 | 0.0188 (12) | 0.0366 (17) | 0.0281 (13) | −0.0046 (12) | 0.0028 (10) | −0.0042 (12) |
C3 | 0.0233 (13) | 0.0352 (18) | 0.0356 (14) | 0.0019 (12) | 0.0003 (11) | 0.0004 (12) |
C4 | 0.0219 (12) | 0.0310 (16) | 0.0299 (13) | −0.0020 (12) | 0.0001 (10) | −0.0020 (11) |
C5 | 0.0260 (14) | 0.0308 (17) | 0.0467 (16) | −0.0020 (12) | −0.0024 (12) | 0.0081 (13) |
C6 | 0.0278 (14) | 0.0278 (16) | 0.0450 (15) | −0.0059 (12) | −0.0003 (12) | 0.0078 (13) |
C7 | 0.0177 (12) | 0.0326 (16) | 0.0317 (13) | −0.0017 (12) | 0.0021 (10) | −0.0005 (12) |
C8 | 0.0220 (12) | 0.0290 (16) | 0.0343 (13) | −0.0011 (12) | −0.0003 (10) | 0.0041 (12) |
C9 | 0.0228 (12) | 0.0299 (16) | 0.0278 (12) | −0.0038 (11) | 0.0012 (10) | −0.0008 (11) |
C10 | 0.0256 (13) | 0.0307 (17) | 0.0437 (15) | −0.0045 (12) | −0.0031 (11) | 0.0074 (12) |
C11 | 0.0256 (13) | 0.0376 (19) | 0.0372 (14) | −0.0094 (12) | 0.0001 (11) | 0.0040 (12) |
C12 | 0.0205 (12) | 0.0313 (17) | 0.0289 (12) | −0.0009 (12) | 0.0040 (10) | −0.0020 (12) |
C13 | 0.0204 (12) | 0.0205 (15) | 0.0332 (13) | 0.0012 (11) | 0.0031 (10) | −0.0024 (11) |
C14 | 0.0276 (13) | 0.0322 (17) | 0.0286 (12) | −0.0012 (13) | 0.0024 (10) | 0.0016 (12) |
C15 | 0.0281 (14) | 0.0411 (18) | 0.0281 (13) | −0.0006 (12) | −0.0061 (11) | 0.0007 (12) |
C16 | 0.0188 (12) | 0.0349 (18) | 0.0336 (13) | −0.0014 (11) | 0.0003 (10) | −0.0013 (11) |
C17 | 0.0187 (12) | 0.0330 (16) | 0.0265 (12) | 0.0013 (11) | −0.0007 (10) | −0.0003 (11) |
Cu1—O1 | 1.9337 (16) | C4—C9 | 1.424 (4) |
Cu1—O1i | 1.9337 (16) | C5—C6 | 1.349 (3) |
Cu1—N2ii | 2.0476 (19) | C5—H5 | 0.9300 |
Cu1—N2iii | 2.0476 (19) | C6—C7 | 1.414 (4) |
O1—C1 | 1.277 (3) | C6—H6 | 0.9300 |
O2—C1 | 1.246 (3) | C7—C8 | 1.372 (4) |
O3—C12 | 1.227 (3) | C8—C9 | 1.410 (3) |
O4—H4 | 0.90 (3) | C8—H8 | 0.9300 |
O5—H51 | 0.75 (4) | C9—C10 | 1.410 (4) |
O5—H52 | 0.77 (4) | C10—C11 | 1.367 (3) |
N1—C12 | 1.347 (3) | C10—H10 | 0.9300 |
N1—C7 | 1.410 (3) | C11—H11 | 0.9300 |
N1—H1 | 0.81 (3) | C12—C13 | 1.497 (3) |
N2—C16 | 1.341 (3) | C13—C17 | 1.377 (3) |
N2—C17 | 1.345 (3) | C13—C14 | 1.389 (3) |
N2—Cu1iv | 2.0476 (19) | C14—C15 | 1.377 (3) |
C1—C2 | 1.503 (3) | C14—H14 | 0.9300 |
C2—C3 | 1.374 (4) | C15—C16 | 1.380 (3) |
C2—C11 | 1.405 (4) | C15—H15 | 0.9300 |
C3—C4 | 1.417 (3) | C16—H16 | 0.9300 |
C3—H3 | 0.9300 | C17—H17 | 0.9300 |
C4—C5 | 1.416 (4) | ||
O1—Cu1—O1i | 160.69 (12) | C8—C7—C6 | 120.0 (2) |
O1—Cu1—N2ii | 93.07 (7) | N1—C7—C6 | 116.2 (2) |
O1i—Cu1—N2ii | 90.06 (7) | C7—C8—C9 | 120.1 (2) |
O1—Cu1—N2iii | 90.06 (7) | C7—C8—H8 | 120.0 |
O1i—Cu1—N2iii | 93.07 (7) | C9—C8—H8 | 120.0 |
N2ii—Cu1—N2iii | 161.31 (12) | C8—C9—C10 | 121.8 (2) |
C1—O1—Cu1 | 119.48 (17) | C8—C9—C4 | 119.8 (2) |
H51—O5—H52 | 104 (4) | C10—C9—C4 | 118.4 (2) |
C12—N1—C7 | 128.7 (2) | C11—C10—C9 | 121.4 (3) |
C12—N1—H1 | 114 (2) | C11—C10—H10 | 119.3 |
C7—N1—H1 | 118 (2) | C9—C10—H10 | 119.3 |
C16—N2—C17 | 117.1 (2) | C10—C11—C2 | 120.7 (3) |
C16—N2—Cu1iv | 123.25 (15) | C10—C11—H11 | 119.6 |
C17—N2—Cu1iv | 119.30 (15) | C2—C11—H11 | 119.6 |
O2—C1—O1 | 124.2 (2) | O3—C12—N1 | 124.8 (2) |
O2—C1—C2 | 120.2 (2) | O3—C12—C13 | 121.1 (2) |
O1—C1—C2 | 115.6 (2) | N1—C12—C13 | 114.1 (2) |
C3—C2—C11 | 119.3 (2) | C17—C13—C14 | 118.5 (2) |
C3—C2—C1 | 120.2 (2) | C17—C13—C12 | 119.8 (2) |
C11—C2—C1 | 120.5 (2) | C14—C13—C12 | 121.7 (2) |
C2—C3—C4 | 121.5 (3) | C15—C14—C13 | 118.4 (2) |
C2—C3—H3 | 119.2 | C15—C14—H14 | 120.8 |
C4—C3—H3 | 119.2 | C13—C14—H14 | 120.8 |
C5—C4—C3 | 123.1 (2) | C14—C15—C16 | 119.5 (2) |
C5—C4—C9 | 118.3 (2) | C14—C15—H15 | 120.2 |
C3—C4—C9 | 118.7 (2) | C16—C15—H15 | 120.2 |
C6—C5—C4 | 120.9 (3) | N2—C16—C15 | 122.8 (2) |
C6—C5—H5 | 119.6 | N2—C16—H16 | 118.6 |
C4—C5—H5 | 119.6 | C15—C16—H16 | 118.6 |
C5—C6—C7 | 121.0 (3) | N2—C17—C13 | 123.6 (2) |
C5—C6—H6 | 119.5 | N2—C17—H17 | 118.2 |
C7—C6—H6 | 119.5 | C13—C17—H17 | 118.2 |
C8—C7—N1 | 123.8 (2) |
Symmetry codes: (i) −x+1, y, −z+3/2; (ii) −x+1/2, y+1/2, −z+3/2; (iii) x+1/2, y+1/2, z; (iv) x−1/2, y−1/2, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O5v | 0.81 (3) | 2.07 (3) | 2.857 (4) | 164 (3) |
O5—H51···O2ii | 0.75 (4) | 2.13 (4) | 2.861 (3) | 164 (4) |
O5—H52···O3 | 0.77 (4) | 2.04 (4) | 2.811 (4) | 177 (5) |
O4—H4···O2vi | 0.90 (3) | 1.95 (3) | 2.820 (3) | 163 (3) |
Symmetry codes: (ii) −x+1/2, y+1/2, −z+3/2; (v) x, y−1, z; (vi) x, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | [Cu(C17H11N2O3)2(H2O)]·2H2O |
Mr | 700.14 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 296 |
a, b, c (Å) | 29.6255 (8), 6.8582 (2), 14.8264 (4) |
β (°) | 94.728 (3) |
V (Å3) | 3002.14 (14) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.79 |
Crystal size (mm) | 0.18 × 0.16 × 0.16 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.870, 0.884 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 24367, 3705, 2462 |
Rint | 0.071 |
(sin θ/λ)max (Å−1) | 0.667 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.045, 0.095, 1.00 |
No. of reflections | 3705 |
No. of parameters | 234 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.31, −0.28 |
Computer programs: APEX2 (Bruker, 2008), SAINT (Bruker, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Bruker, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O5i | 0.81 (3) | 2.07 (3) | 2.857 (4) | 164 (3) |
O5—H51···O2ii | 0.75 (4) | 2.13 (4) | 2.861 (3) | 164 (4) |
O5—H52···O3 | 0.77 (4) | 2.04 (4) | 2.811 (4) | 177 (5) |
O4—H4···O2iii | 0.90 (3) | 1.95 (3) | 2.820 (3) | 163 (3) |
Symmetry codes: (i) x, y−1, z; (ii) −x+1/2, y+1/2, −z+3/2; (iii) x, y+1, z. |
Acknowledgements
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2012R1A1A2000876).
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Coordination polymers are prepared by employing a wide variety of linking ligands possessing pyridyl–pyridyl, pyridyl–amine, furan–furan, thiophene–thiophene, or pyridyl–carboxylate terminals. For instance, bis(pyridyl)- and dicarboxylate-type linking ligands have long been utilized in preparing such polymers (Robin & Fromm, 2006). In particular, those containing the pyridyl–carboxylate terminals are intriguing due to the presence of both a harder carboxylate oxygen donor and a softer pyridyl nitrogen donor in them. The ligands of this type were employed to prepare unique polymers containing both d- and f-block metals within their frameworks (Hu et al., 2012; Chen et al., 2010; Tang et al., 2010; Yue et al., 2011; Zhu et al., 2010). 6-(Nicotinamido)-2-naphthoic acid (HL) belongs to the pyridyl–carboxylate-type linking ligands, and we recently reported its preparation and structure (Song & Lee, 2012). Our research group also reported the molecular structures of two other related linking ligands (Han & Lee, 2012; Zheng & Lee, 2012). We report herein the structure of a two-dimensional Cu polymer of the HL ligand, which is the first d-block coordination polymer of this ligand.
Fig. 1 shows an asymmetric unit of the title polymer, which consists of one half Cu2+ ion, one 6-(nicotinamido)-2-naphthoato ligand (L), one half aqua ligand, and one lattice water molecule. The Cu1 and O4 atoms lie on the crystallographic twofold axis, and the remaining atoms occupy general positions. The Cu2+ ion is coordinated to two oxygen atoms from two ligands and two nitrogen atoms from another two ligands to form a distorted square plane. The Cu1···O4 length (2.490 (3) Å), which is represented by a dotted line in Fig. 1, is extremely long, considering the covalent radii of Cu (1.28 Å) and O (0.66 Å) atoms. The van der Waals radii of Cu and O atoms are 1.40 and 1.52 Å, respectively, and therefore the Cu1···O4 bond may be best described as a strong van der Waals contact. Consequently, the coordination sphere of the Cu2+ ion may be thought of as square pyramidal, if the Cu1···O4 van der Waals contact is included. The molecular plane, defined by the two O and two N atoms, is extremely distorted from the planarity with the average atomic displacement of 0.328 (1) Å. Two carboxylate oxygen atoms act differently; one (O1) is coordinated to the Cu2+ ion and the other (O2) acts as a H-bond acceptor. The terminal carboxylate and pyridyl groups are bonded to the Cu2+ ions, indicating that this ligand behaves as a linking ligand. The amide group (–CONH–) does not coordinate to the metal ion, and the carbonyl oxygen (O3) acts as a H-bond acceptor and the N–H bond behaves as a H-bond donor. In fact, all of the hydrogen atoms in the amide group and lattice water molecule participate in the hydrogen bonds of the O–H···O or N–H···O types (Table 1). Fig. 2 shows a projection of the title polymer along the c-axis. The repeat unit consists of four ligands and four Cu2+ ions. This unit contains 56 atoms (4 Cu2+ ions and 52 ligand atoms) with the Cu2+···Cu2+ separation of 15.2045 (4) Å. The repeat units are connected by the ligands to form a 2-D layer in the [110] direction.