Structural Effects on the Nonradiative Decay of Alkylbenzenes. The Nature of the 'alpha-Substitution Effect'.

摘要

The previously reported alpha substitution effect, whereby alkyl substituents, on a carbon attached to the benzene ring increase nonradiative decay, is demonstrated to be caused by an increase in the rate of internal conversion. Perdeuteration of the tert-butyl group in tert-butylbenzene has no effect on the phenomenon, thus eliminating involvement of the beta C-H stretching mode in the decay process.