Barry L Westcott
The title salt, [Co(C10H7NOS)2(H2O)2](BF4)2, crystallizes in the monoclinic system (space group P21/n). In the complex cation, the central CoII atom (site symmetry 1) has a pseudo-octa-hedral coordination environment with bonding to pyridyl N [2.0189 (13) Å] and carbonyl O [2.0869 (11) Å] atoms from the 2-thienyl 2-pyridyl ketone ligands. The remaining bonds are to water mol-ecules [2.0903 (13) Å], which form a hydrogen-bonded extended structure with BF4 - counter-ions. The thienyl ring shows disorder through an approximate twofold rotation with an occupancy ratio of 0.951 (3):0.049 (3).