Abstract
The new title Cu II complex of pyridine-2-carboxamide (pca. C 6 H 6 N 2 O), {[Cu(SO 4 )(pca)(H 2 O) 2 ].H 2 O} n , has been synthesized and its crystal structure determined. It forms two crystallographically independent polymeric [Cu(H 2 O) 2 (pca)(SO 4 )]∞ chains in which the sulfate ion adopts a bridging position between two Cu atoms, coordinating via two of its O atoms, with Cu-O bond lengths in the range 2.318(1)-2.455(1)A. The pca ligand is coordinated through the ring N and amide O atoms, forming a five-membered chelate ring with Cu-N distances of 2.010(1) and 1.985(1) A. The base of the elongated square-bipyramidal Cu II coordination is completed by two Cu-O(H 2 O) bonds with lengths in the range 1.961(1)-1.975 A. The polymeric chains are connected by two types of hydrogen bonds, namely, N-H...O bonds between amino N and sulfate O atoms, and O-H...O bonds between the uncoordinated H 2 O molecule and sulfate ions. The influence of the observed hydrogen bonds on the hard structural parameters, such as bond lengths and angles, is analysed.
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