dc.creator Szczesniak, M. en_US dc.creator Person, Willis B. en_US dc.date.accessioned 2006-06-15T18:46:01Z dc.date.available 2006-06-15T18:46:01Z dc.date.issued 1990 en_US dc.identifier 1990-WE-7 en_US dc.identifier.uri http://hdl.handle.net/1811/18358 dc.description $^{1}$ M. Szczenniak, K. Szczepaniak, J. S. Kwiatkowaki, N. KuBulat, and W. B. Person, J. Am. Chem. Soc., 110. 8319, (1988); see also M. J. Nowak, L. Lapinski, J. Fulara, Spectrochim. Acta, to be published. We are grateful for support from NIH Research Grant No. 32988. en_US dc.description Author Institution: Department of Chemistry, University of Florida en_US dc.description.abstract We report here the UV spectra measured for cytocine isolated in an Argon matrix, together with similar studies for 1-methylcytosine and several cytosines halogenated at the 5- position. It is shown that the UV spectrum of this isolated cytosine can be interpreted as the sum of the spectra of 1-methylcytomine and of 5-fluorocytosine. Since the latter is a model for the hydroxy tautomer of cytosine, and the former is a model for the oxo tautomex of cytosine, this observation provides further confirmation of the conclusion1 that both tautomeric forms exist in equilibrium in this hydrophobic environment. Previous studies of the infrared spectra of cytosine isolated in an argon matrix1 have shown that UV photolysis of the isolated cytosine results in the selective photodecomposition of the oxo form of the molecule, leaving higher concentration of the hydroxy tautomer in the matrix after the irradiation. We believe that the key to understanding this selective photo-decomposition is provided by the comparison of the transmittance of the CsI filter through which the matrix was irradiated with the absorption from each of the two model compounds 1. methylcytoaine (as a model for the oxo tautomer), and 5-fluorocytosine (as a model for the hydroxy tautomer) en_US dc.format.extent 78013 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title ULTRAVIOLET SPECTRA OF MATRIX-ISOLATED CYTOSINE AND SOME OF ITS DERIVATIVES, AND THE EFFECT OF FURTHER ULTRAVIOLET IRRADIATION en_US dc.type article en_US
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