Darstellung und struktur von pentamethylcyclopentadienyl-oxo-pentasulfido-vanadium, Cp *VO(S 5)

Abstract

The reaction of the half-sandwich compound Cp *VOCl 2 (Cp * = η 5-pentamethylcyclopentadienyl) with THF solutions of potassium polysulfide, K 2S x ( x > 6), inTHF leads to the pentasulfido-vanadium complex Cp*VO(S 5) ( 1), one which is also found among the soluble side-products of the reaction of Cp *V(CO) 4 with excess sulfur, S 8. Complex 1 contains a six-membered metallacycle in chair conformation, similar to that observed in Cp 2Ti(S 5) and Cp 2V(S 5), although the VS bond distances (average 228.4(2) pm) are shorter and the SVS angles (106.8(1) and 106.1(1)° in the two crystallographically different molecules of 1) are larger than the corresponding parameters in the metallocene derivatives. The vanadium-oxygen bond lengths (159.0(3) and 158.5(4) pm, respectively) are typical of a VO double bond.