New 1,1?-Ring-substituted Vanadocene Dichlorides. Crystal structures of [V(?5-C5H4SiMe3)2Cl2] and [V(?5-C5H5)2Cl2]
作者:Nektarios Tzavellas、Nikolaos Klouras、Caterina P. Raptopoulou
DOI:10.1002/zaac.19966220526
日期:1996.5
AbstractThe 1,1′‐ring‐substituted vanadocene dichlorides [V(η5‐C5H4R)2Cl2] (R = CMe3, SiMe3, SiEt3) have been prepared from VCl4 and the appropriate lithiated cyclopentadiene, C5H4RLi, in 1 : 2 ratios. All complexes were characterized by elemental microanalysis and IR spectroscopy. The crystal structures of [V(η5‐C5H4SiMe3)2Cl2] 3 and the parent compound [V(η5‐C5H5)2Cl2] 1 have been determined by X‐ray diffraction and are in accordance with expectations. Compound 1 crystallizes with two crystallographically independent molecules in its monoclinic unit cell. These two molecules are quite similar in their essential structural features. Compound 3 crystallizes in the triclinic space group P1. The trimethylsilylcyclopentadienyl rings are bound in a staggered relative orientation.