Hydrogen Transfer to Carbonyls and Imines from a Hydroxycyclopentadienyl Ruthenium Hydride:  Evidence for Concerted Hydride and Proton Transfer

2001 ◽  
Vol 123 (6) ◽  
pp. 1090-1100 ◽  
Author(s):  
Charles P. Casey ◽  
Steven W. Singer ◽  
Douglas R. Powell ◽  
Randy K. Hayashi ◽  
Michael Kavana
Keyword(s):  
Proton Transfer ◽  
Hydrogen Transfer ◽  
Ruthenium Hydride ◽  
Hydroxycyclopentadienyl Ruthenium Hydride

scholarly journals Revealing the role of excited state proton transfer (ESPT) in excited state hydrogen transfer (ESHT): systematic study in phenol–(NH3)n clusters

2021 ◽  
Author(s):  
Christophe Jouvet ◽  
Mitsuhiko Miyazaki ◽  
Masaaki Fujii
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Systematic Study ◽  
General Model ◽  
Hydrogen Transfer ◽  
Excited State Proton Transfer

A general model of excited state hydrogen transfer (ESHT) which unifies ESHT and the excited state proton transfer (ESPT) is presented from experimental and theoretical works on phenol–(NH3)n. The hidden role of ESPT is revealed.

Mass spectrometry and computational study of collision-induced dissociation of 9-methylguanine–1-methylcytosine base-pair radical cation: intra-base-pair proton transfer and hydrogen transfer, non-statistical dissociation, and reaction with a water ligand

2020 ◽  
Vol 22 (26) ◽  
pp. 14875-14888 ◽  
Author(s):  
Yan Sun ◽  
May Myat Moe ◽  
Jianbo Liu
Keyword(s):  
Mass Spectrometry ◽  
Proton Transfer ◽  
Radical Cation ◽  
Base Pair ◽  
Hydrogen Transfer ◽  
Theoretical Study ◽  
Computational Study ◽  
Collision Induced Dissociation ◽  
Water Ligand

A combined experimental and theoretical study is presented on the collision-induced dissociation of 9-methylguanine–1-methylcytosine base-pair radical cation ([9MG·1MC]˙+) and its monohydrate ([9MG·1MC]˙+·H2O) with Xe and Ar gases.

Hydrogen Bonding and Proton Transfer to Ruthenium Hydride Complex CpRuH(dppe): Metal and Hydride Dichotomy

2013 ◽  
Vol 52 (4) ◽  
pp. 1787-1797 ◽  
Author(s):  
Gleb A. Silantyev ◽  
Oleg A. Filippov ◽  
Peter M. Tolstoy ◽  
Natalia V. Belkova ◽  
Lina M. Epstein ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Proton Transfer ◽  
Ruthenium Hydride ◽  
Hydride Complex

scholarly journals Electron-Proton Transfer Mechanism of Excited-State Hydrogen Transfer in Phenol-(NH3 ) n (n= 3 and 5)

2017 ◽  
Vol 24 (4) ◽  
pp. 881-890 ◽  
Author(s):  
Mitsuhiko Miyazaki ◽  
Ryuhei Ohara ◽  
Claude Dedonder ◽  
Christophe Jouvet ◽  
Masaaki Fujii
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Hydrogen Transfer ◽  
Transfer Mechanism ◽  
Electron Proton Transfer

Article

1999 ◽  
Vol 77 (5-6) ◽  
pp. 1085-1096 ◽  
Author(s):  
A M Kuznetsov ◽  
Jens Ulstrup
Keyword(s):  
Proton Transfer ◽  
Isotope Effect ◽  
Rate Constants ◽  
Bovine Serum ◽  
Kinetic Isotope Effect ◽  
Hydrogen Transfer ◽  
Low Frequency ◽  
Specific Rate ◽  
Adiabatic Limits ◽  
Kinetic Isotope

We discuss a broad theoretical frame for hydrogen transfer in chemical and biological systems. Hydrogen tunnelling, coupling between the tunnel modes and the environment, and fluctuational barrier preparation for hydrogen tunnelling are in focus and given precise analytical forms. Specific rate constants are provided for three limits, i.e., the fully diabatic, the partially adiabatic, and the fully adiabatic limits. These limits are all likely to represent real chemical or biological hydrogen transfer systems. The rate constants are referred particularly to the driving force and temperature dependence of the kinetic isotope effect (KIE). The origin of these correlations is different in the three limits. It is rooted in the tunnel factor and weak excitation of the heavier isotopes in the former two limits, giving a maximum for thermoneutral processes. A new observation is that the adiabatic limit also accords with a KIE maximum for thermoneutral processes but the KIE is here reflected solely in the activation Gibbs free energy differences, in this case rooted in the low-frequency environmental nuclear dynamics. Three systems of biological hydrogen tunnelling, viz. lipoxygenase, yeast alcohol dehydrogenase, and bovine serum amine oxygenase, offer unusual new cases for analysis and have been analysed using the theoretical frames. All the systems show large KIEs and strong indications of hydrogen tunnelling. They also represent different degrees of fluctuational barrier preparation, with lipoxygenase as the most rigid and bovine serum amine oxygenase as the softest system.Key words: generalized Born-Oppenheimer scheme, kinetic isotope effect, gated proton transfer, partially adiabatic proton transfer, proton tunnelling in enzyme catalysis.

Sign in / Sign up

Export Citation Format

Share Document