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Title: Tautomer‐Specific Resonant Photoelectron Imaging of Deprotonated Cytosine Anions

Journal Article · · Angewandte Chemie

Abstract 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.

Sponsoring Organization:
USDOE
OSTI ID:
1510102
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 131 Journal Issue: 23; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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