Time-resolved spectra of an intramolecular exciplex

• Published in: Journal of photochemistry Vol. 12; no. 1; pp. 11 - 16
• Main Authors: de B. Costa, Sílvia M., Prieto, M.J., Ghiggino, K.P., Phillips, D., Roberts, A.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1980
• ISSN: 0047-2670
• DOI: 10.1016/0047-2670(80)85075-1

The intramolecular exciplex formed from N,N-methylphenyl 2-ethyl-(2-naphthoyl)amine was studied by time-resolved emission spectroscopy using a cavity-dumped argon ion laser (wavelength, λ = 257.25 nm) and single-photon counting detection. The spectra, taken at several time delays after excitation, show that the excited amine (lifetime, τ f = 1.78 ns) contributes to the exciplex formation. The excited naphthoate (τ f = 7.98 ns) is the major species observed in the late-gated spectrum (31 ns after excitation), its lifetime being larger than that of the exciplex (τ f = 4.27 ns). The results obtained are explained on the basis of the existence of a static quenching and a slow dynamic quenching.