BIS(CYCLOPENTADIENYL TRANSITION METAL) COMPLEXES RICH IN SULFUR

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Abstract
Synthetic techniques for the incorporation of elemental sulfur into dimeric cyclopentadienyl transition metals are reported. The resulting sulfur rich complexes (S/M ratio ≥ 2:1) differ significantly in their structures, depending on the nature of the metal. With the exception of the chromium triad only 3d elements are concerned. The reactivity of the dicyclopentadienyl dimetal sulfides is localized both on the sulfur ligands and at the metal center as demonstrated by isomerization reactions and reactions with organic molecules. Some of these processes are of catalytic interest. The complexes (MeC5H4)2V2S4. (C5Me5)2Cr2S5 and (C5Me5)2Mo2S4 are useful substrates for the synthesis of tri- and tetra-nuclear clusters, the latter being first representatives of mixed metal heterocubanes with a M2M'2S4 core. In a short chapter the present knowledge on cyclopentadienyl complexes containing other chalcogenides is summarized.

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