The acid—base equilibria of dimethylphenols in the ground and the first excited singlet states

Measurements of the acidity constants in the ground (p K a ( S 0)) and the lowest excited singlet (p K a ( S 1)) states for 2,3-, 2,4-, 2,5-, 2,6-, 3,4- and 3,5-dimethylphenols in aqueous solution have been carried out spectrophotometrically at 25°C. The p K a values in S 0 have been derived from th...

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Published in:Spectrochimica acta. Part A: Molecular spectroscopy 1987, Vol.43 (9), p.1161-1163
Main Authors: Vert, E.Tomás, Casamayor, P.Medina, Torrent, A.Olba, Castellote, A.Codoñer
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
General. Nomenclature, chemical documentation, computer chemistry
Theory of reactions, general kinetics
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Measurements of the acidity constants in the ground (p K a ( S 0)) and the lowest excited singlet (p K a ( S 1)) states for 2,3-, 2,4-, 2,5-, 2,6-, 3,4- and 3,5-dimethylphenols in aqueous solution have been carried out spectrophotometrically at 25°C. The p K a values in S 0 have been derived from the absorption spectra and the p K a values in S 1 were estimated by means of the Forster cycle. It is found that the hydroxy group is more acidic in the first excited singlet than in the ground state.
ISSN:0584-8539
DOI:10.1016/0584-8539(87)80035-1