CHARACTERISATION BY INFRARED OF PI- AND SIGMA-BONDING IN METAL-INDENYL COMPLEXES - A STUDY OF MERCURY, TIN AND PALLADIUM DERIVATIVES

Synthesis of the new indenyl compound, Ind2Hg as well as IndHgX (X = CI, Br), is described. Although their structure could not yet be elucidated from NMR measurements, a comparison of their IR spectra with those of π-indenyl complexes shows that in the CH stretching and deformation regions, the presence of some characteristic bands indicates a σ-metal-to-carbon bonding. Another new indenyl compound (IndPdCl)2 is also described. Preliminary IR and NMR measurements do not allow the nature of palladium-indenyl bonding to be determined with certainty. © 1969.