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Title: Excited State Dynamics of Isocytosine; a Hybrid Case of Canonical Nucleobase Photodynamics
Authors: jacob berenbeim, $Other$Other
samuel boldissar, $Other$Other
faady siouri, $AAUP$Palestinian
gregory gate, $AAUP$Other
michael r. haggmark, $Other$Other
briana aboulache, $Other$Other
trevor cohen, $Other$Other
mattanjah de vries, $Other$Other
Issue Date: 6-Oct-2017
Publisher: The Journal of Physical Chemistry Letter
Abstract: We present resonant two-photon ionization (R2PI) spectra of isocytosine (isoC) and pump–probe results on two of its tautomers. IsoC is one of a handful of alternative bases that have been proposed in scenarios of prebiotic chemistry. It is structurally similar to both cytosine (C) and guanine (G). We compare the excited-state dynamics with the Watson–Crick (WC) C and G tautomeric forms. These results suggest that the excited-state dynamics of WC form of G may primarily depend on the heterocyclic substructure of the pyrimidine moiety, which is chemically identical to isoC. For WC isoC we find a single excited-state decay with a rate of ?1010 s–1, while the enol form has multiple decay rates, the fastest of which is 7 times slower than for WC isoC. The excited-state dynamics of isoC exhibits striking similarities with that of G, more so than with the photodynamics of C.
Appears in Collections:Faculty & Staff Scientific Research publications

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