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Di­aqua­bis­(pyridine-2-carbox­amide-2N1,O2)copper(II) squarate

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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 – and C—H… interactions between the moieties also stabilize the crystal structure.
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Document Type: Research Article

Publication date: December 1, 2004

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