X-ray crystal structures of a series of [MII(SR)4]2− complexes (MMn, Fe, Co, Ni, Zn, Cd and Hg) with S4 crystallographic symmetry

Abstract The X-ray crystal structures of an isomorphous and isostructural series of compounds, M(II) tetrathiolate complexes, [Et 4 N] 2 [M(S-2-Ph-C 6 H 4 ) 4 ]·2CH 3 CN (MMn, Fe, Co, Ni, Zn, Cd, Hg) are determined. The compounds crystallize in the tetragonal space group I 4 c 2 (No. 120), which imposes S 4 crystallographic symmetry on the [M(S-2-Ph-C 6 H 4 ) 4 ] 2− anions. Each of the [M(S-2-Ph-C 6 H 4 ) 4 ] 2− anions have tetragonally compressed [MS 4 ] 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.