Phototautomerism in the lowest excited singlet state of 1-hydroxy-2-carboxyanthraquinone |
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Authors: | Salinas F de La Peña A M Murillo J A |
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Institution: | Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain. |
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Abstract: | The dependence of the absorption and fluorescence spectra of 1-hydroxy-2-carboxy-anthraquinone on pH and Hammett acidity have been studied. This compound exhibits phototautomerism in its uncharged and its singly-charged anionic species in aqueous media. Its ground state (pK(a)) and lowest excited singlet-state (pK(a)( *)) dissociation constants have been determined by absorptiometric and fluorimetric titrations and the assignment of the pK(a) and pK( *)(a) values to the equilibria concerned has been carefully considered. |
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