Poly[(μ-pentafluorobenzoato-κ²O:O′)(pentafluorobenzoato-κO)(μ-pyrazine-κ²N:N′)copper(II)]: a coordination polymer linked into a three-dimensional network by intermolecular C—H...F—C interactions

Abstract

In the title compound, [Cu(C6F5COO)2(C4H4N2)]n, (I), the asymmetric unit contains one Cu(II) cation, two anionic pentafluorobenzoate ligands and one pyrazine ligand. Each Cu(II) centre is five-coordinated by three O atoms from three independent pentafluorobenzoate anions, as well as by two N atoms from two pyrazine ligands, giving rise to an approximately square-pyramidal coordination geometry. Adjacent Cu(II) cations are bridged by a pyrazine ligand and two pentafluorobenzoate anions to give a two-dimensional layer. The layers are stacked to generate a three-dimensional supramolecular architecture via strong intermolecular C-H···F-C interactions, as indicated by the F···H distance of 2.38 Å.