Raman spectroscopic study of the reaction of oxygen with polyacetylene adsorbed on TiO2(rutile) and of benzene adsorption on rutile
Abstract
A Raman spectroscopic study of the reaction of oxygen with trans-polyacetylene adsorbed on rutile shows that the polymer breaks down. Benzene is obtained as a volatile reaction product and, particularly in the presence of the short-wavelength 457.9 nm Raman exciting line, this is converted to a different surface species of an aromatic nature. The adsorption of benzene itself on a bare TiO2 surface gives a very closely similar spectrum from 457.9 nm excitation to that obtained from the O2/polyacetylene reaction. The final aromatic surface product is tentatively identified as para-polyphenyl in type.
Longer-wavelength Raman excitation leads to less conversion of the polyacetylene to the final aromatic product; under these conditions benzene is also largely adsorbed intact on the TiO2 surface.
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