Tetrakis(μ2-2,2-dimethylpropanoato-κ2 O,O′)bis-[(pyridine-κN)copper(II)]: A monoclinic polymorph

Abstract

The structure of the dinuclear title complex, [Cu2(C 5H9O2)4(C5H 5N)2], represents a monoclinic polymorph of the previously reported triclinic form [Blewett et al. (2006). Acta Cryst. E62, m420-m422]. Each carboxylate group is bidentate bridging and the distorted octa-hedral geometry about each CuII atom is completed by a pyridine N atom and the other Cu atom [Cu⋯Cu = 2.6139 (7) Å]. In the crystal, molecules are connected into supra-molecular chains via π-π interactions formed by the pyridine rings [centroid-centroid distance = 3.552 (3) Å] and these are connected into a two-dimensional array in the ac plane by C - H⋯π contacts. One of the tert-butyl groups is disordered over two orientations in a 0.734 (6):0.266 (6) ratio. © 2010.