Abstract
Transient ESR spectra have been observed for the lowest triplet states of naphthalene, quinoline (QN), quinolinium (QNH +), isoquinoline (iso-QN) and isoquinolinium (iso-QNH +) in ethanol at 77 K. using a time-resolved ESR technique. With the aid of computer simulations, it is concluded that, following the protonation of QN, the sublevel initially populated by S 1→T 1 intersystem crossing changes from T y in QN to T z in QNH + ( y and z are close to the long and short in-plane molecular axes, respectively).
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