“…In the 13 C{ 1 H} NMR spectra the methyl carbons of the Cp ligand resonate between δ 11.26 and 12.00 ppm, whereas the ring carbon atom resonances appear between δ 117.32 and 120.38 ppm. These values are in similar ranges to those found in the fully characterized complexes Cp 2 YN(SiMe 3 ) 2 and Cp 2 YCH(SiMe 3 ) 2 [9], and support the normal bent metallocene structure for the chlorides.…”