Solvation influence on the Brown's rotation of benzocarbolyn in alcoholic solutions

The methods of optical and EPR spectroscopy, are used to show that the deviations from linear dependence of 1/P and T/ɳ in the Levshin-Perrin formula for ethanol solutions of benzocarboline are due to the temperature dependences of the lifetime of the excited state, and of the solvated volume of molecules of the dissolved substance. It is proved that it is justified to use a spherical model for the discussion of Brownian rotation of benzocarboline molecules.