Low-temperature luminescence of purine derivatives: Salt effects

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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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Autor principal: Murgida, D.H
Otros Autores: Erra-Balsells, R.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Elsevier 1999
Acceso en línea:Registro en Scopus
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100 1 |a Murgida, D.H. 
245 1 0 |a Low-temperature luminescence of purine derivatives: Salt effects 
260 |b Elsevier  |c 1999 
270 1 0 |m Erra-Balsells, R.; Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, c.c.74-suc. 30, 1430-Buenos Aires, Argentina; email: erra@qo.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
536 |a Detalles de la financiación: Ehime University 
536 |a Detalles de la financiación: Universidad de Buenos Aires, TW-34 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PIP 1998-2000 
536 |a Detalles de la financiación: The authors thank University of Buenos Aires (TW-34) and CONICET (PIP 1998-2000) for partial financial support and Dr. Hiroshi Nonami (College of Agriculture, Ehime University, Japan) for some chemicals. REB is a member of Carrera del Investigador Cientı́fico of Consejo Nacional de Investigaciones Cientı́ficas y Técnicas (CONICET). 
593 |a Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, c.c.74-suc. 30, 1430-Buenos Aires, Argentina 
690 1 0 |a CAFFEINE 
690 1 0 |a LOW TEMPERATURE LUMINESCENCE 
690 1 0 |a PURINES 
690 1 0 |a THEOBROMINE 
690 1 0 |a THEOPHYLLINE 
690 1 0 |a XANTHINES 
700 1 |a Erra-Balsells, R. 
773 0 |d Elsevier, 1999  |g v. 85  |h pp. 129-136  |k n. 1-3  |p J Lumin  |x 00222313  |w (AR-BaUEN)CENRE-571  |t Journal of Luminescence 
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