Excited-state dynamics and efficient triplet formation in phenylthiophene compounds
Physical Chemistry Chemical Physics Pub Date: 2011-12-15 DOI: 10.1039/C2CP23602H
Abstract
Ultrafast transient absorption spectroscopy monitors the solution-phase dynamics of 2-phenylthiophene (PT), 2-methyl-5-phenylthiophene (MPT), and 2,4-dimethyl-5-phenylthiophene (DMPT) following excitation to the first singlet excited state. Rapid spectral evolution indicates that structural relaxation on the S1 potential energy surface occurs within ～100 fs, whereas the picosecond-scale kinetics reveal efficient intersystem crossing to the triplet manifold of states. The rate of intersystem crossing is significantly faster for DMPT (21.6 ± 1.0 ps) than for PT (102 ± 5 ps) and MPT (132 ± 3 ps). The measurements provide new limits on the timescale for a competing isomerization reaction in which the phenyl group changes position on the thiophene ring. The role of methyl substitution in driving the intersystem crossing is discussed.
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Journal Name：Physical Chemistry Chemical Physics
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CAS no.: 89640-58-4
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