X-RAY CRYSTAL-STRUCTURES OF A SERIES OF [M(II)(SR)4]2- COMPLEXES (M = MN, FE, CO, NI, ZN, CD AND HG) WITH S4 CRYSTALLOGRAPHIC SYMMETRY

The X-ray crystal structures of an isomorphous and isostructural series of compounds, M(II) tetrathiolate complexes, [Et4N]2[M(S-2-Ph-C6H4)4].2CH3CN (M = Mn, Fe, Co, Ni, Zn, Cd, Hg) are determined. The compounds crystallize in the tetragonal space group I4c2 (No. 120), which imposes S4 Crystallographic symmetry on the [M(S-2-Ph-C6H4)4]2-anions. Each of the [M(S-2-Ph-C6H4)4]2- anions have tetragonally compressed [MS4] cores. The structures of this series of complexes add to the structural analysis of conformational isomers of [M(SAr)4]2-/1- complexes which are significant as models for [M(II)-(S-cys)4] centers in proteins.