Photophysical properties of safranine and phenosafranine: A comparative study by laser flash photolysis and laser induced optoacoustic spectroscopy

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• 作者：Broglia ; Mart??n F. ; G??mez ; Mar??a L. ; Bertolotti ; Sonia G. ; Montejano ; Hern??n A. ; et. al.
• 关键词：Photophysical properties ; Safranine ; Phenosafranine ; Dyes ; LIOAS ; Laser photolysis
• 刊名：Journal of Photochemistry & Photobiology, A: Chemistry
• 出版年：2005
• 出版时间：July 1, 2005
• 年：2005
• 卷：173
• 期：2
• 页码：115-120
• 全文大小：114 K

文摘

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 Φ_TT 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 Φ_T 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.