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Title: Spectroscopy and photophysics of 4- and 7-hydroxycoumarins and their thione analogs
Authors: Seixas de Melo, J. 
Fernandes, P. F. 
Keywords: Coumarins; Photophysics; Singlet state; Triplet state; Fluorescence; Phosphorescence
Issue Date: 2001
Citation: Journal of Molecular Structure. 565-566:(2001) 69-78
Abstract: Acid-base equilibria were studied for 4-hydroxycoumarin, 7-hydroxy-4-methylcoumarin and their thione derivatives in different media for their ground and lowest energy singlet and triplet excited states. The ethoxylated and/or methoxylated derivatives were also investigated. Characterization involves fluorescence spectra, quantum yields, lifetimes, phosphorescence spectra, lifetimes, and triplet-triplet absorption spectra. From their pKa values it was found that 4 and 7-hydroxycoumarins are more acidic in their lowest excited singlet states than in S0. The origin and character of the lowest singlet and triplet excited states is discussed.
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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