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Recently we have elaborated a new, selfconsistent method of analysis of steric effects in organic con­ jugated systems 1. The results of such an analysis for the ground state, the first excited state and the ionic state of biphenyl were published in this journal2. However, after completing the article on biphenyl it was found that a twisting of the two phenyl rings causes a shift of the ionization or the excitation to one of the two rings, the shift being complete for 0 = 90°. Here we give some details on this peculiar behaviour. In Fig. 1 we give the bond lengths and the net charge distribution for the biphenyl anion, as calcu­ lated for 0 = 90°. However, the calculated barrier of rotation is quite small, 1.5 kcal/mole, a strong vibronic coupling being thus possible. In Fig. 2 we show the dependence of the bond lengths on the twisting angle

Note on the Unsymmetrical Form of Biphenyl in its First Excited State and the Ionic State