| Abstract |
The reaction of [Ni(eta-R-Ind)(2)] (R = H, Me) with one equivalent of 1,5-cyclooctadiene (COD), in the presence of a stoichiometric amount of HBF4 (in Et2O), at low temperature, afforded the corresponding cationic [Ni(eta-1-R-Ind)(eta(4)-COD)]BF4 in high yields. In the solid state, these complexes showed a slightly distorted pseudo-square-planar geometry around the metal centre. In solution, H-1 NMR spectra showed the existence of a fluxional process involving the 1,5-cyclooctadiene ligand. This process was investigated by DFT calculations and the results exclude the possibility of eta(5)-indenyl rotation. (C) 2016 Elsevier Ltd. All rights reserved. |
