Intramolecular donor-acceptor systems. 7. Solvent dielectric relaxation effects on the photophysics of 6-(phenylamino)-N,N-dimethyl-2-naphthalenesulfonamides

E. M. Kosower, H. Kanety, H. Dodiuk, G. Striker, T. Jovin, H. Boni, D. Huppert

Research output: Contribution to journalArticlepeer-review

Abstract

Excitation of 6-[(4-X-phenyl)amino]-N,N-dimethyl-2-naphthalenesulfonamides (X = Br, H, CH3, OCH3) produces a nonplanar S1 (S1,np) state which undergoes intramolecular electron transfer in a wide polarity range of solvents to form a charge-transfer S1 state (S1,ct), the processes being defined by emission maxima and fluoroescence quantum yields as a function of solvent polarity and phenyl substituent. From the variation of fluorescence lifetimes with solvent polarity using dioxane-water and dioxane-methanol mixtures, solvent dielectric relaxation rates are implicated as the controlling feature for the nonradiative electron-transfer process which quenches the charge-transfer fluorescence and reforms the S0 state.

Original languageEnglish
Pages (from-to)2479-2484
Number of pages6
JournalJournal of Physical Chemistry
Volume87
Issue number14
DOIs
StatePublished - 1983

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