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Issue 37, 2010
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Rhodamines in the gas phase: cations, neutrals, anions, and adducts with metal cations

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Abstract

Optical spectroscopy of biological molecules in the gas phase has recently gained considerable attention, being able to provide complementary structural information in the absence of native matrix. Biomolecules can change their properties when brought into the gas phase, and so can chromophores associated with them. Understanding the photophysics of chromophore labels is central for the correct interpretation of experimental data. In this report, the structure and the optical properties of Rhodamine 19 (R19) in the gas phase were examined by a combination of Fourier-transform ion cyclotron resonance mass spectrometry and visible-light laser spectroscopy. While R19 in solution is found either in neutral (R19n) or protonated (R19+H+) forms, other structures can be generated in the gas phase, such as anions (R19−H−) and adducts with metal cations (R19+M+). Experimental evidence for the lactone structure of neutral gas-phase R19 is presented for the first time. The different properties of gas-phase compared to solution-phase R19 are discussed in view of structural analysis of labeled gas-phase biological molecules by optical spectroscopy.

Graphical abstract: Rhodamines in the gas phase: cations, neutrals, anions, and adducts with metal cations

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Publication details

The article was received on 12 Jan 2010, accepted on 05 Jul 2010 and first published on 10 Aug 2010


Article type: Paper
DOI: 10.1039/C000807A
Citation: Phys. Chem. Chem. Phys., 2010,12, 11710-11714
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    Rhodamines in the gas phase: cations, neutrals, anions, and adducts with metal cations

    K. Chingin, R. M. Balabin, K. Barylyuk, H. Chen, V. Frankevich and R. Zenobi, Phys. Chem. Chem. Phys., 2010, 12, 11710
    DOI: 10.1039/C000807A

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