Excited state spectroscopy of 1,5-naphthyridine: Identification of the lowest energy excited singlet state as 1B g(1nπ*)

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Abstract
The electronic absorption spectra of excited‐state 1,5‐naphthyridine from 400 to 650 nm are reported in several solvents. The time evolution of these spectra indicate that they arise from one or more Sn←S1 transitions. Comparison of these observed spectra with calculated excited state absorption spectra obtained using the INDO molecular orbital formalism demonstrates excellent agreement of the transition energies and oscillator strengths with Sn(1Au)←S1(1Bg,nπ*) transitions. These results conclusively identify the lowest excited singlet state of 1,5‐naphthyridine as 1Bg(1nπ*).