Tetra­kis(μ(2)-2,2-dimethyl­propanoato-κ(2) O,O′)bis­[(pyridine-κN)copper(II)]: a monoclinic polymorph

The structure of the dinuclear title complex, [Cu(2)(C(5)H(9)O(2))(4)(C(5)H(5)N)(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 octa­hedral geometry about each Cu(II) 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 supra­molecular 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.