Acta Cryst. (2009). E65, m497  [ doi:10.1107/S1600536809012628 ]

catena-Poly[[aquanickel(II)]--pyridine-2,6-dicarboxylato-[aquanickel(II)]--2,5-di-4-pyridyl-1,3,4-thiadiazole]

X.-Y. Zhang

Abstract: The two independent Ni^II ions in the one-dimensional title complex, [Ni₂(C₇H₃NO₄)₂(C₁₂H₈N₄S)(H₂O)₂]_n or [Ni₂(pydc)₂(bpt)(H₂O)₂]_n (H₂pydc = pyridine-2,6-dicarboxylic acid and bpt = 2,5-di-4-pyridyl-1,3,4-thiadiazole), have different coordination environments. One Ni^II ion is in a slightly-distorted octahedral coordination environment formed by three O atoms from two adjacent pydc ligands, two N atoms from bpt and pydc ligands, and one water molecule, while the other Ni^II ion is in distorted square-pyramidal geometry, coordinated by two O atoms from two carboxylate groups and two N atoms from the pyridine rings of the pydc and bpt ligands in the basal plane, while a coordinated water molecule occupies the apical site. In the crystal structure, the H atoms of both water molecules are involved in intermolecular hydrogen bonds with the O atoms of uncoordinated carboxylate groups, which link chains into a three-dimensional network.

Online 8 April 2009

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