Abstract
We challenge the traditional interpretation of the temperature dependence of the Chance-DeVault cytochrome oxidation reaction in Chromatium in terms of a transition from low-temperature nuclear tunneling to a high-temperature activated electron transfer (ET). We attribute this unique temperature dependence to two parallel ET processes from two distinct low-potential cytochromes to the bacteriochlorophyl dimer cation. These involve a slow activationless process, which dominates at low temperatures (T ≤ 120 K) and an activated process, which is practically exclusive at high temperatures. Our analysis implies that low-temperature nuclear tunneling over a nuclear barrier has not yet been documented in electron transfer reactions.
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Bixon, M., Jortner, J. (1986). Does Cytochrome Oxidation in Bacterial Photosynthesis Manifest Tunneling Effects?. In: Jortner, J., Pullman, B. (eds) Tunneling. The Jerusalem Symposia on Quantum Chemistry and Biochemistry, vol 19. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4752-8_29
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DOI: https://doi.org/10.1007/978-94-009-4752-8_29
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