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저자정보
McGovern, David A. (School of Chemistry and Centre for Chemical Synthesis and Chemical Biology, Trinity College) Doorley, Gerard W. (School of Chemistry and Centre for Chemical Synthesis and Chemical Biology, Trinity College) Whelan, Aine M. (School of Chemistry and Centre for Chemical Synthesis and Chemical Biology, Trinity College) Parker, Anthony W. (Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus) Towrie, Michael (Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus) Kelly, John M. (School of Chemistry and Centre for Chemical Synthesis and Chemical Biology, Trinity College) Quinn, Susan J. (School of Chemistry and Centre for Chemical Synthesis and Chemical Biology, Trinity College)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제4호
발행연도
2009.1
수록면
542 - 548 (7page)

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The photophysical properties of 5'-guanosine monophosphate (5'-GMP) and polyguanylic acid {poly(G)} in $D_2O$ solutions of varying pH have been studied using picosecond transient infrared absorption spectroscopy. Whereas in neutral or weakly alkaline solution only the vibrationally excited electronic ground state of 5'-GMP is observed, in acidic solution the relatively long-lived ($229{\pm}20\;ps$) electronic excited state of protonated 5'-GMP, which possesses strong absorptions at 1517 and $1634\;cm^{-1}$, could be detected. The picosecond transient behaviour of polyguanylic acid in acidic solution is also very different from that of the polynucleotide in neutral solution due not only to the protonation of guanine moieties yielding the protonated excited state but because of the disruption of the guanine stacks which are present in the species in neutral solution.

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