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HOW HYDROGEN BONDING OF CARBAZOLE TO ETHANOL AFFECTS ITS FLUORESCENCE QUENCHING RATE BY ELECTRON ACCEPTOR QUENCHER MOLECULES
Author(s) -
Ahmad Aftab,
Durocher Gilles
Publication year - 1981
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1981.tb09044.x
Subject(s) - carbazole , photochemistry , fluorescence , electron acceptor , quenching (fluorescence) , acceptor , hydrogen bond , molecule , chemistry , ethanol , electron , organic chemistry , physics , quantum mechanics , condensed matter physics
— Absorption spectra and fluorescence quenching of carbazole (C) and N‐ethyl carbazole (EC) by some aliphatic halocarbons have been studied in 3‐methylpentane (3MP) and ethanol (EtOH). Both steady‐state and transient kinetic measurements were used to determine the quenching rate constants ( k q ). These rate constants were found to be sensitive to the polarity and also to the hydrogen bonding ability of the solvents used. Endothermic electron transfer reactions were shown to take place in these systems. When the electron donor C is involved in hydrogen bonding with EtOH, the net effect is a decrease in k q . This is explained by taking into account the red‐shifted (0,0) transition energy (E s ) of the 1 L b absorption band when the reaction is nearly diffusion controlled. For reaction far from diffusion controlled, the E s value correction to k q is not enough to explain the low k q value observed.