Acid-base properties of N-methyl-substituted 1,2-dihydroquinolines in the ground and excited states

Changes in the absorption and fluorescence spectra of 1,2,2,3-tetramethyl-( 1 ), 1,2,2,4-tetramethyl-( 2 ), 6-ethoxy-1,2,2,4-tetramethyl-( 3 ), and 1,2,6-trimethyl-1,2-dihydroquinolines ( 4 ) were studied in aqueous solution over a wide pH range from 1.0 to 12.0. The quantum yields of fluorescence a...

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Bibliographic Details
Published in:High energy chemistry 2010-09, Vol.44 (5), p.399-403
Main Authors: Lygo, O. N., Nekipelova, T. D., Khodot, E. N.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Photochemistry
Physical Chemistry
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Summary:Changes in the absorption and fluorescence spectra of 1,2,2,3-tetramethyl-( 1 ), 1,2,2,4-tetramethyl-( 2 ), 6-ethoxy-1,2,2,4-tetramethyl-( 3 ), and 1,2,6-trimethyl-1,2-dihydroquinolines ( 4 ) were studied in aqueous solution over a wide pH range from 1.0 to 12.0. The quantum yields of fluorescence and the values of p K a of dihydroquinolines (DHQs) under study in the ground and excited states were determined, p K a = 4.5, 3.8, 4.5, and 4.2 for the ground state of compounds 1–4, respectively, and p K a ∼ 1.7 for the S 1 * state for all DHQs.
ISSN:0018-1439
1608-3148
DOI:10.1134/S0018143910050085