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Proton Transfer of Guanine Radical Cations Studied by Time-Resolved Resonance Raman Spectroscopy Combined with Pulse Radiolysis

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Title
Proton Transfer of Guanine Radical Cations Studied by Time-Resolved Resonance Raman Spectroscopy Combined with Pulse Radiolysis
Author(s)
Jungkweon Choi; Cheolhee Yang; Mamoru Fujitsuka; Sachiko Tojo; Hyotcherl Ihee; Tetsuro Majima
Publication Date
2015-12
Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.6, no.24, pp.5045 - 5050
Publisher
AMER CHEMICAL SOC
Abstract
The oxidation of guanine (G) is studied by using transient absorption and time-resolved resonance Raman spectroscopies combined with pulse radiolysis. The transient absorption spectral change demonstrates that the neutral radical of G (G•(−H+)), generated by the deprotonation of G radical cation (G•+), is rapidly converted to other G radical species. The formation of this species shows the pH dependence, suggesting that it is the G radical cation (G•+)′ formed from the protonation at the N7 of G•(−H+). On one hand, most Raman bands of (G•+)′ are up-shifted relative to those of G, indicating the increase in the bonding order of pyrimidine (Pyr) and imidazole rings. The (G•+)′ exhibits the characteristic CO stretching mode at ∼1266 cm−1 corresponding to a C−O single bond, indicating that the unpaired electron in (G•+)′ is localized on the oxygen of the Pyr ring. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2221
ISSN
1948-7185
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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