Infrared and ESR spectra of reaction intermediates formed from 1,1-diphenylethylene adsorbed on oxides.

概要

論文の詳細を見る
When 1,1-diphenylethylene (DPE) was adsorbed on porous Vycor glass (PVG) or silica–alumina, some unstable reaction intermediates, blue, green, and yellow species, were formed. The blue species produced on the silica–alumina showed a characteristic band at 1525 cm−1, assigned to the shifted C=C stretching band, which disappeared in the green and yellow samples; it also showed an ESR signal. This indicates that the unstable blue species is probably a cation radical (Remark: Graphics omitted.). The infrared spectra of the green and yellow species on the silica–alumina showed new bands, ascribed to the –CH3 and –CH2– vibrations, which were in good agreement with the resonance Raman bands of the carbonium ions formed on the PVG. The green and yellow intermediates, therefore, should be two kinds of carbonium ions. The structures, formation mechanisms, and surface coverages of these intermediates are discussed.
公益社団法人日本化学会の論文