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In the title complex, [Cu(C 7 H 4 NO 4 ) 2 ]·2C 2 H 6 OS, the Cu II  atom is situated on an inversion centre and is  N , O -chelated by two monoanionic 4-carb­oxy­pyridine-2-carboxyl­ate ligands in a slightly distorted square-planar coordination geometry. The dimethyl sulfoxide solvent mol­ecules and Cu II  complex mol­ecules are linked by O—H⋯O hydrogen bonding. In addition, C—H⋯O contacts and π–π inter­actions [centroid–centroid distance = 3.590 (1) Å] occur.

Bis(4-carboxypyridine-2-carboxylato-κ2N,O2)copper(II) dimethyl sulfoxide disolvate

Bis(4-carboxypyridine-2-carboxylato-κ²N,O²)copper(II) dimethyl sulfoxide disolvate