Ribonucleotide Reductase — Coupled Electron/Proton Transfer Mechanisms

In aqueous solution above pH 2.4 with 4% (vol/vol) CH3CN, the complex [RuII(bda)(isoq)2] (bda is 2,2′-bipyridine-6,6′-dicarboxylate; isoq is isoquinoline) exists as the open-arm chelate, [RuII(CO2-bpy-CO2−)(isoq)2(NCCH3)], as shown by 1H and 13C-NMR, X-ray crystallography, and pH titrations. Rates of water oxidation with the open-arm chelate are remarkably enhanced by added proton acceptor bases, as measured by cyclic voltammetry (CV). In 1.0 M PO43–, the calculated half-time for water oxidation is ∼7 μs. The key to the rate accelerations with added bases is direct involvement of the buffer base in either atom–proton transfer (APT) or concerted electron–proton transfer (EPT) pathways.

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Theoretical investigation of excited-state single and double proton transfer mechanisms for 2,5-bis(benzoxazol-2-yl)thiophene-3,4-diol

Dyes and Pigments ◽

10.1016/j.dyepig.2017.02.047 ◽

2017 ◽

Vol 141 ◽

pp. 441-447 ◽

Cited By ~ 21

Author(s):

Jin-Dou Huang ◽

Kun Yu ◽

Huipeng Ma ◽

Shuo Chai ◽

Bin Dong

Keyword(s):

Excited State ◽

Proton Transfer ◽

Theoretical Investigation ◽

Double Proton Transfer ◽

Transfer Mechanisms

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ChemInform Abstract: TOPOTACTIC ELECTRON/PROTON TRANSFER REACTIONS OF TRANSITION METAL COMPLEXES WITH COLUMNAR AND CLUSTER STRUCTURES

Chemischer Informationsdienst ◽

10.1002/chin.198119025 ◽

1981 ◽

Vol 12 (19) ◽

Author(s):

R. SCHOELLHORN ◽

K. WAGNER ◽

H. JONKE

Keyword(s):

Transition Metal ◽

Proton Transfer ◽

Metal Complexes ◽

Transition Metal Complexes ◽

Transfer Reactions ◽

Proton Transfer Reactions ◽

Electron Proton Transfer

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Proton transport over nanoparticle surface in insulating nanoparticle film-based humidity sensor

Japanese Journal of Applied Physics ◽

10.35848/1347-4065/ac4b0e ◽

2022 ◽

Author(s):

Shinya Kano ◽

Harutaka MEKARU

Keyword(s):

Activation Energy ◽

Proton Transfer ◽

Proton Transport ◽

Humidity Sensor ◽

Silica Nanoparticle ◽

Humidity Sensors ◽

Nanoparticle Surface ◽

Transfer Mechanisms ◽

Hydrophobic Ligand ◽

Nanoparticle Film

Abstract We study a proton transport on the surface of insulating nanoparticles for humidity sensors. We use the approach to reveal proton transfer mechanisms in humidity sensitive materials. Hydrophilic and hydrophobic ligand-terminated silica nanoparticle films are adopted for evaluating temperature dependence of the ion conductivity. According to the activation energy of the conductivity, we explain the Grotthuss (H+ transfer) and vehicular (H3O+ transfer) mechanisms are mainly dominant on hydrophilic (-OH terminated) and hydrophobic (acrylate terminated) surface of nanoparticles, respectively. This investigation gives us a clue to understand a proton transfer mechanism in solution-processed humidity-sensitive materials such as oxide nanomaterials.

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