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Origin of difference between one-electron redox potentials of guanosine and guanine: Electrochemical and quantum chemical study

Article Abstract:

Cyclic voltammetry was used to measure the rates of the chemical oxidation of guanine (G), guanosine (Gs), 2'-deoxyguanosine (dG), and 2'-deoxyguanosine 5'-monophosphate (dGMP) by electrochemically generated tris(2,2'-bipyridyl)ruthenium(III). The numeric fit of voltammograms to an ECCCE type of mechanism provided the equilibrium and rate constants of the two-step chemical oxidation of the guanine species.

Oxidation-reduction reaction, Oxidation-reduction reactions, Guanosine

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Effect of hydration on the lowest singlet pipi(super *) excited-state geometry of guanine: A theoretical study

Article Abstract:

The effect of explicit hydration on the ground and lowest singlet pipi(super *) excited-state geometry and on the selected stretching vibrational frequencies corresponding to the different NH sites of the guanine acting as hydrogen-bond donors is investigated by an ab-initio computational study. It is found that the first solvation shell of the guanine can accommodate up to six water molecules.

Solvation, Hydration (Chemistry)

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The guanine cation radical: Investigation of deprotonation states by ESR and DFT

Article Abstract:

ESR and density functional theory (DFT) are used to investigate the favored site of deprotonation of the guanine cation radical ([G.sup..+]) in an aqueous medium. The analyses of the ESR spectrum of dideprotonated [G.sup..+] has shown the preferred site in the aqueous states for the first time.

United States, Usage, Density functionals, Density functional theory

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