INVESTIGADORES
MONTEJANO Hernan Alfredo
artículos
Título:
Photophysical properties of safranine and phenosafranine. A comparative study by laser flash photolysis and laser induced optoacoustic spectroscopy
Autor/es:
MARTIN F. BROGLIA; MARIA L. GÓMEZ; SONIA G. BERTOLOTTI; HERNAN A. MONTEJANO; CARLOS M. PREVITALI
Revista:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Editorial:
Elsevier B.V.
Referencias:
Año: 2005 vol. 173 p. 115 - 120
ISSN:
1010-6030
Resumen:
The triplet quantum yield of the dyes safranine and phenosafranine was determined in methanol and acetonitrile by laser flash photolysis (LFP) and laser induced opto-acoustic spectroscopy (LIOAS). The excited singlet properties of both dyes were also determined in the two solvents. The LFP determination of the triplet yield was carried out by actinometric determination of the product ÖTT and independent estimation of T by the singlet depletion method and by energy transfer using anthracene as energy donor. The results of the three methodologies coincide within the experimental error. The values of ÖT are in the range 0.21?0.50, and in the case of phenosafranine are considerably higher than those previously reported in the literature. An interesting outcome is that the results of LIOAS determination agree with those of LFP within the confidence interval.
