Optical properties of protonated Rhodamine 19 isomers in solution and in the gas phase

Literature Information

Publication Date 2010-10-01
DOI 10.1039/C0CP00482K
Impact Factor 3.676
Authors

Roman M. Balabin, Vladimir Frankevich, Huanwen Chen, Konstantin Barylyuk, Robert Nieckarz, Alexey Fedorov, Renato Zenobi


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Abstract

Visible light absorption and fluorescence of three positional isomers of protonated Rhodamine 19 (o-, m- and p-R19H+) were studied in solution and in the gas phase. In solution, strong solvatochromic effects lead to spectral shifts between rhodamine isomers. In contrast, in the gas phase, these species were found to exhibit very similar fluorescence, while pronounced differences were observed in the absorption spectra. The o-R19H+ was found to have the largest Stokes shift in the gas phase (around 10 nm), suggesting that an intramolecular relaxation operates in the excited electronic state for this isomer. Several mechanisms for this relaxation are proposed, such as the change of the dihedral angle between the carboxyphenyl group and the xanthene chromophore or that between the carboxylic group and the phenyl ring.

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Back matter

Front/Back Matter

DOI: 10.1039/B508442N

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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