A Mixed-Ligand Zinc(II) Complex Containing a Bridging Dithiolate Ligand

Abstract

The mixed-ligand Zn II complex bis(μ-1,2-benzenedithiolato)-1κS,1:2κ 2 S'; 2κS, 1:2κ 2 S'-bis[(2,2'-bipyrimidine-κ 2 N 1 ,N 1' )zinc], [Zn 2 (C 6 H 4 S 2 ) 2 (C 8 H 6 N 4 ) 2 ], containing benzenedithiolate (bdt) and 2,2'-bipyrimidine (bpyrm) has been synthesized and found to have the dinuclear formulation [Zn(bdt)(bpyrm)] 2 . The dinuclear complex has crystallographically imposed 1 symmetry with severely distorted square-pyramidal coordination about the metal atoms. One S atom of the bdt ligand bridges the Zn atoms in an asymmetric fashion [Zn-S(1) 2.433 (3), Zn'-S(1) 2.475 (3) A] while the second S atom is bound in a terminal mode at a shorter distance [Zn-S(2) 2.303 (3) A]. The formation of a bdt-bridged rather than a bpyrm-bridged species may be favored by a significant π-stacking interaction between the phenyl ring of the bdt ligand and one ring of the bpyrm ligand.