Accession Number : AD0683797

Title :   FLUORESCENCE QUENCHING VIA INTRAMOLECULAR PROTON TRANSFER.

Descriptive Note : Technical rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMISTRY

Personal Author(s) : Ware,W. R. ; Shukla,P. R. ; Sullivan,P. J. ; Bremplis,R. V.

Report Date : 10 MAR 1969

Pagination or Media Count : 19

Abstract : Studies of fluorescence quenching via intramolecular proton transfer are described for the systems 3-hydroxy-2-naphthoic acid in several solvents. It has been found that bases which promote the proton transfer in nonpolar solvents function by parallel static and dynamic mechanisms and that the mechanism proposed by Hirota, which assumed rapid establishment of the proton transfer equilibrium during the lifetime of the excited state, is not correct. The mechanisms of both the static and the dynamic processes have been investigated by using fluorescence lifetime techniques and by making steady-state fluorescence quenching measurements. The results for various solvents and at various temperatures are reported for the acid, its methyl ester, and the corresponding methoxy derivative. (Author)

Descriptors :   (*CARBOXYLIC ACIDS, *PHOTOCHEMICAL REACTIONS), (*FLUORESCENCE, *QUENCHING(INHIBITION)), NAPHTHALENES, REACTION KINETICS, MOLECULAR ENERGY LEVELS, RELAXATION TIME, ESTERS, MOLECULAR ASSOCIATION

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE