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)]

The bis-sulfur-bridged copper(II) dimer [{CuL(HL)Cl}(2)] (HL = N-ferro cenecarbonyl-N',N'-dimethylthiourea) has been synthesized and structur ally characterized. The central copper(II) ion has a distorted tetrahe dral environment with one chloride and three sulfur atoms derived from one terminal and two bridging acylthiourea ligands. The two sulfur at oms of both bridging ligands with two copper(II) ions form a strictly planar Cu2S2 bridging core including two short [2.3649 Angstrom] and t wo longer Cu-S distances [2.4496 Angstrom]. Dimers with this type of b ridging are very scarce. Magnetic measurements showed antiferromagneti c coupling between the copper(II) centers through the sulfur bridges. The best fitting to the experimental magnetic susceptibilities gave g = 2.06, J = -196.3 cm(-1).