Gas??phase tautomers of protonated 1??methylcytosine. Preparation, energetics, and dissociation mechanisms

…, ML Cuadrado??Peinado, M Polášek…

Index: Yao, Chunxiang; Cuadrado-Peinado, Maria L.; Polasek, Miroslav; Turecek, Frantisek Journal of Mass Spectrometry, 2005 , vol. 40, # 11 p. 1417 - 1428

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Citation Number: 22

Abstract

Abstract Tautomers of 1-methylcytosine that are protonated at N-3 (1+) and C-5 (2+) have been specifically synthesized in the gas phase and characterized by tandem mass spectrometry and quantum chemical calculations. Ion 1+ is the most stable tautomer in aqueous and methanol solution and is likely to be formed by electrospray ionization of 1- methylcytosine and transferred in the gas phase. Gas-phase protonation of 1- ...