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All Five Forms of Cytosine Revealed in the Gas Phase

Authors

  • Prof. José L. Alonso,

    Corresponding author
    1. Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es
    • Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es===

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  • Dr. Vanesa Vaquero,

    1. Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es
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  • Dr. Isabel Peña,

    1. Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es
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  • Prof. Juan C. López,

    1. Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es
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  • Santiago Mata,

    1. Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es
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  • Prof. Walther Caminati

    1. Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Universidad de Valladolid, 47005 Valladolid (Spain) http://www.gem.uva.es
    2. Present address: Dipartimento di Chimica “G. Ciamician” dell'Università via Selmi 2, 40126 Bologna (Italy)
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  • This research was supported by the Ministerio de Ciencia e Innovación (grants CTQ 2006-05981/BQU, CTQ 2010-19008, and Consolider Ingenio 2010 CSD 2009-00038) and the Junta de Castilla y León (grant VA070A08). W.C. thanks the molecular spectroscopy group of the University of Valladolid for their kind hospitality, and the Ministry of Education of the Spanish Government for a grant for a position as “Invited Professor”.

Abstract

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Give me five! All five tautomers and conformers of cytosine were characterized in the gas phase by laser ablation molecular beam Fourier transform microwave spectroscopy. The spectra were assigned unambiguously on the basis of the hyperfine structure due to the three 14N nuclei (see picture; N blue, O red). The relative energies of the identified species were estimated from the relative intensities of the spectra.

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