Pressure effect on the eda-complexes formed between benzene, toluene and tetracyanoethylene in carbon tetrachloride

Abstract

The intermolecular charge transfer spectra of tetracyanoethylene With benzene and toluene in carbon tetrachloride have been studied as a function of pressure up to 1500kg/cm^2 at 25℃. The equilibrium constants and molar extinction coefficients at high pressure were determined from Scott's equation, and these values were increased with increasing pressure. The volume changes ΔV for the formation of the complexes from their components were -3.4cm^3/mole for benzene-TCNE complex, and -4.9cm^3/mole for toluene-TCNE complex. The absorption maxima shifted to longer wavelength with increasing pressure. The causes of the small spectral shift were considered from the viewpoint of charge transfer interaction in solution.