Raman spectroscopic evidence for bent metallocene fragments [M(Cp)2]2+

Raman spectroscopy was used as a very simple and convenient tool for the detection of bent metallocene fragments M(Cp)₂]²⁺ (Cp = η⁵‐cyclopentadienyl ring; M = early transition metal) both in solid state and in solution. The rules were formulated and tested on the group of titanium complexes containing one or two η⁵‐bonded cyclopentadienyl rings, as well as on a series of model α‐amino acid complexes of antitumour active titanocene and vanadocene dichlorides. Copyright © 2005 John Wiley & Sons, Ltd.