Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/5212
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. | URI: | https://hdl.handle.net/10316/5212 | DOI: | 10.1016/S0022-2860(01)00458-6 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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