Synthesis, crystal structure and magnetic properties of a bis-sulfur-bridged copper(II) dimer containing N-ferrocenecarbonyl-N ′,N ′-dimethylthiourea (HL), [{CuL(HL)Cl}2]

Abstract

The bis-sulfur-bridged copper() dimer [{CuL(HL)Cl} 2 ] (HL = N-ferrocenecarbonyl-N Ј,N Ј-dimethylthiourea) has been synthesized and structurally characterized. The central copper() ion has a distorted tetrahedral environment with one chloride and three sulfur atoms derived from one terminal and two bridging acylthiourea ligands. The two sulfur atoms of both bridging ligands with two copper() ions form a strictly planar Cu 2 S 2 bridging core including two short [2.3649 Å] and two longer Cu᎐S distances [2.4496 Å]. Dimers with this type of bridging are very scarce. Magnetic measurements showed antiferromagnetic coupling between the copper() centers through the sulfur bridges. The best fitting to the experimental magnetic susceptibilities gave g = 2.06, J = Ϫ196.3 cm Ϫ1 .