Raman spectroscopic studies df chemisorbed unsaturated hydrdcarbons on nickel and silver films

Abstract

Raman spectroscopy have been used to study chemisorption of ethylene, acetylene and benzene on thin evaporated Ni and Ag films at 80 K. In the spectra of C2H4 and C2H2 were observed Π-d bonds structures, the latters are characterized by a low-frequency shift of double and triple bond frequencies of about 100 cm−1. The hybridization change of the carbon atoms from sp toward sp2 with acetylene chemisorption and from sp2 toward sp3 with ethylene chemisorption is also observed at 80 K. The Raman spectra provide evidence that benzene is chemisorbed predominantly in Π-bonded state to the Ni and Ag surface respectively.