Abstract
Intramolecular charge-transfer compounds of the p-( N,N-dialkylamino)-benzylidenemalononitrile series exhibit a weak fluorescence emission due to efficient non-radiative deactivation of the S 1,et excited state by a complex free rotor mechanism. In general, three possible channels are implicated in this deactivation; when all three channels are active, a synergistic effect is developed across the molecule. Examination of the non-radiative rate constant and apparent activation energy of reorientation in viscous medium (glycerol) for different compounds of the series provides an indication of the relative structural modification which occurs during the non-radiative deactivation via each channel.
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