NDLI: Generation of singlet oxygen by indotricarbocyanine dyes in low-polarity media

Content Provider	Springer Nature Link
Author	Samtsov, M. P. Voropai, E. S. Kaplevskii, K. N. Mel’nikov, D. G.
Copyright Year	2008
Abstract	We present the results of a study of the spectral luminescence properties of three groups of indotricarbocyanine dyes, each of which is formed from compounds with the same cation and different anions. In high-polarity solvents, in the absorption and emission spectra of the dyes we see one type of center; in low-polarity solvents, due to the presence of different ionic forms of the dyes (free ions, contact ion pairs), we observe either one type or two types of centers. By analysis of the luminescence of molecular oxygen in the 1.27 µm spectral region, we determined the efficiency of photosensitization of $^{1}$O$_{2}$ formation by dyes in deuterated solvents. We have shown that in low-polarity solvents, the yield for singlet oxygen generation is higher for indotricarbocyanine dyes which are found in the contact ion pair state and which also contain a heavy atom (I) in the anion. We have observed that an increase in the fraction of contact ion pairs in solution as the dye concentration increases or when an additional salt is introduced leads to an increase in the quantum yield for generation of singlet oxygen. In polar deuterated acetonitrile, the counterion has no effect on the efficiency of photosensitization of oxygen by the dyes.
Starting Page	692
Ending Page	699
Page Count	8
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	75
Issue Number	5
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2008-12-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	indotricarbocyanine dyes ion pairs spectral properties singlet oxygen Analytical Chemistry Atomic and Molecular Structure and Spectra
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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