title: Polymorphism of mer-μ-oxalato-bis[chloridotripyridinecobalt(II)] pyridine disolvate.
abstract: Single crystals of a triclinic polymorphic form of mer-μ-oxalato-bis[chloridotripyridinecobalt(II)] pyridine disolvate, [Co2(C2O4)Cl2(C5H5N)6]·2C5H5N, have been prepared by solvothermal methods. The structure and geometric parameters strongly resemble those of the previously reported monoclinic polymorph [Bolte (2006). Acta Cryst. E62, m597-m598]. In both polymorphic forms, the dinuclear complex molecules are located on a crystallographic centre of inversion, with the Co(II) cations in a distorted octahedral environment consisting of a chloride ligand, three pyridine ligands and a chelating bis-bidentate oxalate ligand. This last serves as a bridging ligand between two Co(II) cations. The polymorphs differ in the mutual orientation of their pyridine ligands in the dinuclear molecules and in their intermolecular connectivity. In the triclinic polymorph, C-H···O, C-H···Cl, C-H···π and π-π interactions link the dinuclear molecules into a three-dimensional structure. Pyridine solvent molecules are attached to this structure via weak interactions.
authors.affiliation: Department of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia. barbara.modec@fkkt.uni-lj.si
authors.forename: Barbara
authors.initials: B
authors.lastname: Modec