Abstract
Total phosphorescence and Tx sublevel excitation spectra of pyrimidine in benzene and cyclohexane are reported. With increasing excitation energy absorption into the1B1 nπ* vibronic ladder leads to an increase of the populating rate of Ty, Tz relative to Tx. For pyrimidine in benzene (p-xylene) a second electronic origin is observed 2416 (2260) cm−1 above the S1 S0 00 band and assigned to1A2 nπ*. The spin-orbit coupling mechanism that accounts for the intersystem crossing into Tx is discussed.
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