Low-temperature luminescence of purine derivatives: Salt effects

Xanthines (caffeine, theophylline and theobromine) and purine have very low quantum yields of fluorescence in ethanol and acetonitrile solutions at room temperature (Φf < 10-3; naphthalene as fluorescence reference). At 77 K xanthines show good fluorescence and phosphorescence spectra, while...

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Detalles Bibliográficos
Autores principales: Murgida, D.H., Erra-Balsells, R.
Formato: JOUR
Materias:
Caffeine
Low temperature luminescence
Purines
Theobromine
Theophylline
Xanthines
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00222313_v85_n1-3_p129_Murgida
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00222313_v85_n1-3_p129_Murgida
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spelling todo:paper_00222313_v85_n1-3_p129_Murgida2023-10-03T14:28:43Z Low-temperature luminescence of purine derivatives: Salt effects Murgida, D.H. Erra-Balsells, R. Caffeine Low temperature luminescence Purines Theobromine Theophylline Xanthines Xanthines (caffeine, theophylline and theobromine) and purine have very low quantum yields of fluorescence in ethanol and acetonitrile solutions at room temperature (Φf < 10-3; naphthalene as fluorescence reference). At 77 K xanthines show good fluorescence and phosphorescence spectra, while purine only shows phosphorescence. Working at low temperature, the effect of the properties of the solid matrix (solvent composition and the presence of inorganic salts) on the emission spectra were studied. It was observed that the addition of inorganic salts changes the optical properties of the matrix (snowed matrix, cracked matrix, etc.) as well as produces heavy atom effect. These effects are opposite in the case of fluorescence, but are co-operative for phosphorescence. © 1999 Elsevier Science B.V. All rights reserved. Fil:Murgida, D.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Erra-Balsells, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00222313_v85_n1-3_p129_Murgida
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Caffeine
Low temperature luminescence
Purines
Theobromine
Theophylline
Xanthines
spellingShingle Caffeine
Low temperature luminescence
Purines
Theobromine
Theophylline
Xanthines
Murgida, D.H.
Erra-Balsells, R.
Low-temperature luminescence of purine derivatives: Salt effects
topic_facet Caffeine
Low temperature luminescence
Purines
Theobromine
Theophylline
Xanthines
description Xanthines (caffeine, theophylline and theobromine) and purine have very low quantum yields of fluorescence in ethanol and acetonitrile solutions at room temperature (Φf < 10-3; naphthalene as fluorescence reference). At 77 K xanthines show good fluorescence and phosphorescence spectra, while purine only shows phosphorescence. Working at low temperature, the effect of the properties of the solid matrix (solvent composition and the presence of inorganic salts) on the emission spectra were studied. It was observed that the addition of inorganic salts changes the optical properties of the matrix (snowed matrix, cracked matrix, etc.) as well as produces heavy atom effect. These effects are opposite in the case of fluorescence, but are co-operative for phosphorescence. © 1999 Elsevier Science B.V. All rights reserved.
format JOUR
author Murgida, D.H.
Erra-Balsells, R.
author_facet Murgida, D.H.
Erra-Balsells, R.
author_sort Murgida, D.H.
title Low-temperature luminescence of purine derivatives: Salt effects
title_short Low-temperature luminescence of purine derivatives: Salt effects
title_full Low-temperature luminescence of purine derivatives: Salt effects
title_fullStr Low-temperature luminescence of purine derivatives: Salt effects
title_full_unstemmed Low-temperature luminescence of purine derivatives: Salt effects
title_sort low-temperature luminescence of purine derivatives: salt effects
url http://hdl.handle.net/20.500.12110/paper_00222313_v85_n1-3_p129_Murgida
work_keys_str_mv AT murgidadh lowtemperatureluminescenceofpurinederivativessalteffects
AT errabalsellsr lowtemperatureluminescenceofpurinederivativessalteffects
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