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Issue 42, 2010
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Optical properties of protonated Rhodamine 19 isomers in solution and in the gas phase

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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.

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

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Publication details

The article was received on 07 May 2010, accepted on 01 Sep 2010 and first published on 01 Oct 2010


Article type: Paper
DOI: 10.1039/C0CP00482K
Citation: Phys. Chem. Chem. Phys., 2010,12, 14121-14127
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    Optical properties of protonated Rhodamine 19 isomers in solution and in the gas phase

    K. Chingin, R. M. Balabin, V. Frankevich, H. Chen, K. Barylyuk, R. Nieckarz, A. Fedorov and R. Zenobi, Phys. Chem. Chem. Phys., 2010, 12, 14121
    DOI: 10.1039/C0CP00482K

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