Acta Cryst. (2004). E60, m1945-m1948  [ doi:10.1107/S1600536804030090 ]

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

I. Uçar, A. Bulut, O. Z. Yesilel, H. I. Ölmez and O. Büyükgüngör

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-HO and O-HN hydrogen bonds. Intermolecular - and C-H interactions between the moieties also stabilize the crystal structure.

Online 27 November 2004

Copyright © International Union of Crystallography
IUCr Webmaster