The Effect of Pressure on the Electronic Absorption Spectra of Alkali Metal Cation-Chloranil and -Bromanil Anion Radical Salts, and the Dimerization of the Chloranil Anion Radical in Solution

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Abstract
The pressure dependence, up to 7 kbar, of the electronic absorption spectra of ion-radical salts composed of the alkali metal cation and the chloranil or bromanil anion radical in the crystalline state at room temperature, and the temperature dependence, down to 134°K, of the dimerization of chloranil anions in an ethanol solution at 1 bar have been studied. The absorption band in the visible region shows a blue shift with an increase in the pressure for Li+ and Na+ salts, while for K+ and Rb+ salts the spectra are insensitive to the pressure. The anion radicals seem to be in the dimeric electronic state for the former and to be in the monomeric state for the latter, in the crystalline state.

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