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Linear and nonlinear (CARS) raman spectroscopic investigations of cyanine dyes

โœ Scribed by A. Lau; K. Kneipp; W. Werncke; K. Lenz; H.-J. Weigmann; D. Fassler; G. Hinzmann

Publisher
Elsevier Science
Year
1982
Weight
476 KB
Volume
24
Category
Article
ISSN
0378-4487

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โœฆ Synopsis

The methanolic and methanolic aqueous or aqueous solutions of the first three representatives of the homologeous series of 3,3'-diethyl-2,2* benzthiacyanines exhibiting an increasing dimerisation with an increasing amount of water in the solvent have been investigated by spontaneous Raman scattering and CARS with different optimum excitation frequencies. Within the accuracy of our experiments (210 cm") there are no differences between the measured Raman wave numbers of the chromophoric system of monomer6 and dimers.

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Resonance CARS spectra of 1,l '-diethyl-3,3,3',3'-tetramethylindocarbocyanine iodide in water, methanol or sodium dodecylsulfate (SDS) micelles reveal bands ascribable to a photoisomer. These bands appear also in the resonance Raman spectra, in the presence of SDS micelles.