Influence of the proton relay spacer on hydrogen electrocatalysis by cobalt hangman porphyrins

2021 ◽  
Author(s):  
Manolis M. Roubelakis ◽  
D. Kwabena Bediako ◽  
Dilek K. Dogutan ◽  
Daniel G. Nocera
Keyword(s):  
Proton Relay

A bio-inspired mononuclear manganese catalyst for high-rate electrochemical hydrogen production

2021 ◽  
Vol 50 (14) ◽  
pp. 4783-4788
Author(s):  
Jie Yang ◽  
Shuanglin He ◽  
Qianqian Wu ◽  
Ping Zhang ◽  
Lin Chen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Electrochemical Measurements ◽  
High Rate ◽  
Turnover Frequency ◽  
Molecular Catalyst ◽  
Proton Relay ◽  
Excellent Activity

A bio-inspired manganese molecular catalyst featuring an intramolecular aniline as a proton relay was synthesized and used for hydrogen production. Electrochemical measurements with this complex show excellent activity (turnover frequency over 104 s−1).

A biomimetic phenol substituent effect on the reaction of a dimethylplatinum(ii) complex with oxygen: proton coupled electron transfer and multiple proton relay

2015 ◽  
Vol 51 (51) ◽  
pp. 10334-10336 ◽  
Author(s):  
Mohamed E. Moustafa ◽  
Paul D. Boyle ◽  
Richard J. Puddephatt
Keyword(s):  
Electron Transfer ◽  
Substituent Effect ◽  
Dramatic Effect ◽  
Proton Coupled Electron Transfer ◽  
Proton Relay

A phenol substituent has a dramatic effect on the oxidation of a dimethylplatinum(ii) complex with O2.

scholarly journals And the Winner is…︁Azadithiolate: An Amine Proton Relay in the [FeFe] Hydrogenases

2013 ◽  
Vol 52 (51) ◽  
pp. 13518-13520 ◽  
Author(s):  
David Schilter ◽  
Thomas B. Rauchfuss
Keyword(s):  
Proton Relay

scholarly journals “Newton’s cradle” proton relay with amide–imidic acid tautomerization in inverting cellulase visualized by neutron crystallography

2015 ◽  
Vol 1 (7) ◽  
pp. e1500263 ◽  
Author(s):  
Akihiko Nakamura ◽  
Takuya Ishida ◽  
Katsuhiro Kusaka ◽  
Taro Yamada ◽  
Shinya Fushinobu ◽  
...  
Keyword(s):  
Glycoside Hydrolases ◽  
Side Chain ◽  
Enzymatic Reactions ◽  
X Ray Diffraction ◽  
Peptide Bonds ◽  
Proton Relay ◽  
Newton’S Cradle ◽  
Dynamics Simulations ◽  
Hydrolysis Of

Hydrolysis of carbohydrates is a major bioreaction in nature, catalyzed by glycoside hydrolases (GHs). We used neutron diffraction and high-resolution x-ray diffraction analyses to investigate the hydrogen bond network in inverting cellulase PcCel45A, which is an endoglucanase belonging to subfamily C of GH family 45, isolated from the basidiomycete Phanerochaete chrysosporium. Examination of the enzyme and enzyme-ligand structures indicates a key role of multiple tautomerizations of asparagine residues and peptide bonds, which are finally connected to the other catalytic residue via typical side-chain hydrogen bonds, in forming the “Newton’s cradle”–like proton relay pathway of the catalytic cycle. Amide–imidic acid tautomerization of asparagine has not been taken into account in recent molecular dynamics simulations of not only cellulases but also general enzyme catalysis, and it may be necessary to reconsider our interpretation of many enzymatic reactions.

The catalytic mechanism ofDrosophilaalcohol dehydrogenase: Evidence for a proton relay modulated by the coupled ionization of the active site Lysine/Tyrosine pair and a NAD+ribose OH switch

2003 ◽  
Vol 51 (2) ◽  
pp. 289-298 ◽  
Author(s):  
Assen Koumanov ◽  
Jordi Benach ◽  
Silvia Atrian ◽  
Roser Gonzàlez-Duarte ◽  
Andrey Karshikoff ◽  
...  
Keyword(s):  
Active Site ◽  
Catalytic Mechanism ◽  
Proton Relay

Multiple proton relay routes in the reaction mechanism of RNAP II: Assessing the effect of structural model

2014 ◽  
Vol 83 (2) ◽  
pp. 268-281 ◽  
Author(s):  
Rui Zhang ◽  
Anirban Bhattacharjee ◽  
Martin J. Field ◽  
Dennis R. Salahub
Keyword(s):  
Reaction Mechanism ◽  
Structural Model ◽  
Proton Relay ◽  
Rnap Ii

Outer Coordination Sphere Proton Relay Base and Proximity Effects on Hydrogen Oxidation with Iron Electrocatalysts

2019 ◽  
Vol 38 (6) ◽  
pp. 1391-1396 ◽  
Author(s):  
Neeraj Kumar ◽  
Jonathan M. Darmon ◽  
Charles J. Weiss ◽  
Monte L. Helm ◽  
Simone Raugei ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Hydrogen Oxidation ◽  
Proximity Effects ◽  
Proton Relay ◽  
Outer Coordination Sphere

scholarly journals Proton-Enhanced Dielectric Properties of Polyoxometalates in Water under Radio-Frequency Electromagnetic Waves

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1202 ◽  
Author(s):  
Shuntaro Tsubaki ◽  
Shogo Hayakawa ◽  
Tadaharu Ueda ◽  
Tomohiko Mitani ◽  
Ei-ichi Suzuki ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Radio Frequency ◽  
Electromagnetic Waves ◽  
Ionic Conduction ◽  
Silicotungstic Acid ◽  
High Loss ◽  
Grotthuss Mechanism ◽  
Proton Relay ◽  
Organic Solutions ◽  
Loss Factors

Electromagnetic waves, such as microwaves, have been used to enhance various chemical reactions over polyoxometalates. The dielectric properties of catalysts are among the relevant parameters facilitating catalytic reactions under electromagnetic radiation. This study describes the dielectric properties of polyoxometalate catalysts in aqueous and organic solutions to understand the mechanism of interactions between polyoxometalates and electromagnetic waves. Specific loss factors of polyoxometalates were observed at lower frequencies (<1 GHz) by the ionic conduction of the polyoxometalate solution. The evolution of ionic conduction depended strongly on cations rather than anions. Proton-type polyoxometalates exhibited significantly higher loss factors than other cations did. The activation energy for ionic conduction in protonated silicotungstic acid (H4SiW12O40) was significantly low in water (7.6–14.1 kJ/mol); therefore, the high loss factor of protonated polyoxometalates in water was attributed to the proton relay mechanism (i.e., Grotthuss mechanism). The results suggested that the proton relay mechanism at the radio-frequency band is critical for generating selective interactions of polyoxometalates with applied electromagnetic fields.

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