How Single and Bifurcated Hydrogen Bonds Influence Proton-Migration Rate Constants, Redox, and Electronic Properties of Phenoxyl Radicals

2004 ◽  
Vol 43 (5) ◽  
pp. 594-597 ◽  
Author(s):  
Fabrice Thomas ◽  
Olivier Jarjayes ◽  
Hélène Jamet ◽  
Sylvain Hamman ◽  
Eric Saint-Aman ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Electronic Properties ◽  
Rate Constants ◽  
Migration Rate ◽  
Phenoxyl Radicals ◽  
Proton Migration

How Single and Bifurcated Hydrogen Bonds Influence Proton-Migration Rate Constants, Redox, and Electronic Properties of Phenoxyl Radicals

2004 ◽  
Vol 116 (5) ◽  
pp. 604-607 ◽  
Author(s):  
Fabrice Thomas ◽  
Olivier Jarjayes ◽  
Hélène Jamet ◽  
Sylvain Hamman ◽  
Eric Saint-Aman ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Electronic Properties ◽  
Rate Constants ◽  
Migration Rate ◽  
Phenoxyl Radicals ◽  
Proton Migration

Disorder of (NH4)3H(SO4)2 in the high-temperature phase I

2011 ◽  
Vol 67 (2) ◽  
pp. 116-121 ◽  
Author(s):  
Yoo Jung Sohn ◽  
Karine M. Sparta ◽  
Martin Meven ◽  
Gernot Heger
Keyword(s):  
High Temperature ◽  
Hydrogen Bonds ◽  
Phase I ◽  
Careful Consideration ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Atom Model ◽  
Disordered Crystal ◽  
Proton Migration ◽  
Atom Position

The highly disordered crystal structure of triammonium hydrogen disulfate, (NH4)3H(SO4)2, in the high-temperature phase I was studied using single-crystal neutron diffraction. It is known that the O atom involved in hydrogen bonding between neighbouring SO4 tetrahedra is disordered and takes a split-atom position, building a two-dimensional hydrogen-bond network in the (001) plane. The H atoms in these SO4–H—SO4 hydrogen bonds are disordered and hence refined with a split-atom model. Moreover, from the much larger anisotropic mean-square displacements of ammonium protons the NH_4^+ groups were refined with a reasonable split-atom model, and their motional behaviour was also analysed by rigid-body treatment. Finally, careful consideration was given to show possible supplementary proton migration between the ammonium protons and those of the hydrogen bonds in this high-temperature phase.

scholarly journals Interplay between spin crossover and proton migration along short strong hydrogen bonds

2021 ◽  
Author(s):  
Verónica Jornet-Mollá ◽  
Carlos Giménez-Saiz ◽  
Laura Cañadillas-Delgado ◽  
Dmitry S. Yufit ◽  
Judith A. K. Howard ◽  
...  
Keyword(s):  
Activation Energy ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Low Temperatures ◽  
Energy Barrier ◽  
Spin Crossover ◽  
Strong Hydrogen Bond ◽  
Activation Energy Barrier ◽  
Proton Migration

A proton migration across a short strong hydrogen bond can be triggered by spin crossover of a remote Fe2+ cation, with the onset of a photoinduced activation energy barrier for proton motion at low temperatures.

Rate Constants for Reactions of Phenoxyl Radicals in Solution

2005 ◽  
Vol 34 (1) ◽  
pp. 109-199 ◽  
Author(s):  
Pedatsur Neta ◽  
Jan Grodkowski
Keyword(s):  
Rate Constants ◽  
Phenoxyl Radicals

Reactivity of hydroxyl groups of 1,6 : 2,3- and 1,6 : 3,4-dianhydrido-β-D-hexapyranoses in methylation with iodomethane

1988 ◽  
Vol 53 (3) ◽  
pp. 633-637 ◽  
Author(s):  
Stanislav Sámek ◽  
Tomáš Trnka ◽  
Miloslav Černý
Keyword(s):  
Hydrogen Bonds ◽  
Rate Constants ◽  
Silver Oxide ◽  
Relative Rate ◽  
Steric Effects ◽  
Hydroxyl Groups ◽  
Intramolecular Hydrogen Bonds ◽  
Relative Rate Constants ◽  
Intramolecular Hydrogen

Relative rate constants for reaction of 1,6 : 2,3- and 1,6 : 3,4-dianhydro-β-D-hexapyranoses with iodomethane in acetonitrile in the presence of silver oxide were measured. Their values, ranging from 1 to 8.6 were interpreted on the basis of polar and steric effects and intramolecular hydrogen bonds.

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