Catenated polysulfur ligands: the pentasulfides of di-η5-cyclopentadienyl-zirconium(IV) and -hafnium(IV) |
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| Authors: | James M McCall Alan Shaver |
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| Institution: | Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, Que. H3A 2K6 Canada |
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| Abstract: | The thiols Cp2M(SH)2, where M = Ti and Zr, react to form the complexes Cp2MS5 when treated with mono- and di-sulfur transfer reagents. Treatment of Cp2MCl2 with Li2S2 and sulfur gave Cp2MS5, M = Ti, Zr and Hf, in better yield. The new Zr and Hf complexes have a six-membered MS5 ring in a chair conformation similar to the previously observed for M = Ti. Variable temperature NMR studies show that the barriers to MS5 ring inversion decrease in the order Ti > Hf > Zr. |
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