Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 23, Pages 7856-7860Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201903444
Keywords
anions; cytosine; dipole-bound states; photoelectron spectroscopy; tautomerism
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Funding
- Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division of the U.S. Department of Energy [DE-SC0018679]
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Tautomers of the nucleobases play fundamental roles in spontaneous mutations of DNA. Tautomers of neutral cytosine have been studied in the gas phase, but much less is known about charged species. Here, we report the observation and characterization of three tautomers of deprotonated cytosine anions, [trans-keto-amino-N3H-H8b] (tKAN3H8b(-)), [cis-keto-amino-N3H-H8a] (cKAN3H8a(-)) and [keto-amino-H] (KAN1(-)), produced by electrospray ionization. Excited dipole-bound states (DBSs) are uncovered for the three anions by photodetachment spectroscopy. Excitations to selected DBS vibrational levels of cKAN3H8a(-) and tKAN3H8b(-) yield tautomer-specific resonant photoelectron spectra. The current study provides further insight into tautomerism of cytosine and suggests a new method to study the tautomers of nucleobases using electrospray ionization and anion spectroscopy.
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