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Abstract:

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.

Registro:

Documento: Artículo
Título:Low-temperature luminescence of purine derivatives: Salt effects
Autor:Murgida, D.H.; Erra-Balsells, R.
Filiación:Depto. de Quim. Orgánica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, c.c.74-suc. 30, 1430-Buenos Aires, Argentina
Palabras clave:Caffeine; Low temperature luminescence; Purines; Theobromine; Theophylline; Xanthines
Año:1999
Volumen:85
Número:1-3
Página de inicio:129
Página de fin:136
DOI: http://dx.doi.org/10.1016/S0022-2313(99)00059-9
Título revista:Journal of Luminescence
Título revista abreviado:J Lumin
ISSN:00222313
CODEN:JLUMA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222313_v85_n1-3_p129_Murgida

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Citas:

---------- APA ----------
Murgida, D.H. & Erra-Balsells, R. (1999) . Low-temperature luminescence of purine derivatives: Salt effects. Journal of Luminescence, 85(1-3), 129-136.
http://dx.doi.org/10.1016/S0022-2313(99)00059-9
---------- CHICAGO ----------
Murgida, D.H., Erra-Balsells, R. "Low-temperature luminescence of purine derivatives: Salt effects" . Journal of Luminescence 85, no. 1-3 (1999) : 129-136.
http://dx.doi.org/10.1016/S0022-2313(99)00059-9
---------- MLA ----------
Murgida, D.H., Erra-Balsells, R. "Low-temperature luminescence of purine derivatives: Salt effects" . Journal of Luminescence, vol. 85, no. 1-3, 1999, pp. 129-136.
http://dx.doi.org/10.1016/S0022-2313(99)00059-9
---------- VANCOUVER ----------
Murgida, D.H., Erra-Balsells, R. Low-temperature luminescence of purine derivatives: Salt effects. J Lumin. 1999;85(1-3):129-136.
http://dx.doi.org/10.1016/S0022-2313(99)00059-9