Abstract
The polarity-dependent Herzberg—Teller mixing of 1L a- and 1L b-type excited states is investigated for N-ethyl indolines bearing as p-acceptor substituent a cyano (EIN) and a carboxylic acid ethyl ester (EICEE) function. EICEE shows strongly temperature-dependent fluorescence spectral shapes. Low-temperature time-resolved measurements indicate a temporal evolution of the excited-state nature on a time scale faster than that of the solvent relaxation and of the dynamical solvatochromism.
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