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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