Abstract
The title compound, [Cu(C6H6N2O)2(H2O)2](C4O4) [or Cu(pia)2(H2O)2.Sq, where pia is picolinamide or pyridine-2-carboxyamide, and Sq is the squarate dianion, (C4O4)2−], has been synthesized and the crystal structure determination is reported. The Cu2+ cation, located on a centre of symmetry, is coordinated by two symmetry-related aqua ligands together with a pair of symmetry-related bidentate pia molecules and exhibits elongated octahedral trans-[CuN2O4] coordination geometry. The unligated Sq dianion also lies on a crystallographic inversion centre. The squarate O atoms link the Sq ions to the metal complex via O—H⋯O and O—H⋯N hydrogen bonds. Intermolecular π–π and C—H⋯π interactions between the moieties also stabilize the crystal structure.
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