Relaxation mechanism of molecular systems containing hydrogen bonds and free energy temperature dependence of reaction of charges recombination within Rhodobacter sphaeroides RCстатья

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1. Полный текст PPS_2009.pdf 568,9 КБ 23 мая 2012 [Pavel_M]

[1] Krasilnikov P. M., Knox P. P., Rubin A. B. Relaxation mechanism of molecular systems containing hydrogen bonds and free energy temperature dependence of reaction of charges recombination within rhodobacter sphaeroides rc // Photochemical and Photobiological Sciences. — 2009. — Vol. 8. — P. 181–195. Mechanism of protonic relaxation is shown to take place within molecular systems containing hydrogen bonds. The mechanism arises from proton redistribution between two stable states on hydrogen bond line. This redistribution occurs on changes of hydrogen bond double well potential, stipulated by change of molecular system electronic state. A feature of the relaxation process is that is takes place due to tunneling of protons along hydrogen bonds. The charges shift causes electrostatic potential variation in electron localization area, which leads to shift of molecular system energy levels and changes its redox potential. Characteristic time of the protonic relaxation is shown to depend essentially on hydrogen bond bending strain, which increases with temperature rise and decreases abruptly the efficiency of protons redistribution. Hence, rate of this process decreases with temperature, in contrast to the activation process. This relaxation process is shown to be probable source of recombination reaction energetic characteristics (free energy difference ΔG and/or reorganization energy λ) temperature dependence within Rhodobacter sphaeroides RC. [ DOI ]

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