Acta Cryst. (2007). E63, m1492-m1493  [ doi:10.1107/S1600536807018417 ]

Poly[trans-diaquabis(₂-3-pyridylacetato)copper(II)]

S.-N. Qin, F.-P. Liang, Z.-L. Chen and W.-H. Yan

Abstract: The title copper^II coordination polymer, trans-[Cu(C₇H₆NO₂)₂(H₂O)₂]_n, was obtained from a solvothermal reaction of 3-pyridylacetic acid hydrochloride with Cu(ClO₄)₂·6H₂O. The molecule is centrosymmetric, so pairs of equivalent ligands lie trans to each other in a slightly distorted octahedral geometry. The Cu^II center is coordinated by two water molecules [Cu-O = 2.424 (4) Å], two pyridyl N atoms [Cu-N = 2.031 (4) Å], and two carboxylate O atoms [Cu-O1 = 1.968 (4) Å]. All O_carboxylate-Cu-O_carboxylate, O_water-Cu-O_water and N-Cu-N bond angles are 180° due to the inversion symmetry of the complexes. Each 3-pyridylacetate anion uses its pyridine N atom and one carboxylate O atom to connect two Cu^II ions, generating two-dimensional sheets parallel to (212). Each complex exhibits two intramolecular O-HO hydrogen bonds with angles at hydrogen of 156°. Adjacent two-dimensional layers are connected via intermolecular O-HO and weak C-HO hydrogen-bonding contacts, resulting in a three-dimensional framework structure with oxygen as a trifurcated acceptor atom.

Online 25 April 2007

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