Abstract
Picosecond time resolved, excited state absorption spectra following excitation at 355 nm are reported for 1-naphthaldehyde (1-NA) and 2-naphthaldehyde (2-NA) in room temperature solutions. The kinetics of the lowest excited singlet state (S1) decay are determined for each. The S1 lifetimes in cyclohexane are ∼26 ps for 1-NA and ∼55 ps for 2-NA. Both Sn←S1 and Tn←T1 spectra are reported. Molecular orbital model calculations based on the INDO formalism predict excited state singlet–singlet spectra and spin-orbit coupling matrix elements that are consistent with the observed spectra and kinetics.
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