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In the title complex, [Cu(C 6 H 4 O 2 N) 2 ]·2C 9 H 6 O 6 ·2H 2 O, the Cu 2+  ion lies on a center of inversion and coordinates with symmetry related pyridine nitrogen and carboxyl oxygen atoms from two pyridine-2-carboxylic acid anions, giving rise to a square-planar coordination geometry. There are weak axial bonds between Cu and an O atom of a symmetry-related trimesic acid moieties [Cu...O = 2.837 (2) Å] The Cu...O weak interactions and hydrogen bonds stabilize the whole structure.

Bis(pyridine-2-carboxylato-κ2 N,O)copper(II)]–benzene-1,3,5-tricarboxylic acid–water (1/2/2)