Environment Effects on the ESR Spectrum of the Cation Radical of Dimethylketene in Low Temperature Matrices

Article abstract of DOI:10.1246/bcsj.58.1267

The cation radical of dimethylketene produced in γ-irradiated solid solutions of various halocarbons has been investigated by ESR over a temperature range from 77 K to the melting point of each matrix.The cation radical in CCl4 was stable up to about 180 K and the spectrum was well resolved to allow the determination of the anisotropic ESR parameters.In CCl2FCClF2 and CCl2FCCl2F, a series of irreversible spectral changes was observed with an increase in temperature.This process was interpreted in terms of the formation of the dimer cation.In the matrix of CCl3F, the ESR spectrum exhibited extra structure, which varied reversibly with temperature.The analyses of the spectra suggested that the cation radical in CCl3F weakly interacts with surrounding matrix molecules to form adducts.