Absolute Rates of the Solution-Phase Addition of Atomic Hydrogen to a Vinyl Ether and a Vinyl Ester:  Effect of Oxygen Substitution on Hydrogen Atom Reactivity with Olefins

2003 ◽  
Vol 107 (17) ◽  
pp. 3054-3063
Author(s):  
D. D. Tanner ◽  
P. Kandanarachchi ◽  
N. C. Das ◽  
J. A. Franz
Keyword(s):  
Hydrogen Atom ◽  
Vinyl Ether ◽  
Atomic Hydrogen ◽  
Vinyl Ester ◽  
Solution Phase ◽  
Effect Of Oxygen ◽  
Oxygen Substitution

Effect of oxygen substitution on the optoelectronic properties of the ternary ZnSe1-xOx alloys

Optik ◽  
2016 ◽  
Vol 127 (22) ◽  
pp. 11020-11028 ◽  
Author(s):  
I. Sekkiou ◽  
H. Benoudnine ◽  
A. Boukortt ◽  
Y. Zidi
Keyword(s):  
Optoelectronic Properties ◽  
Effect Of Oxygen ◽  
Oxygen Substitution

Effect of oxygen substitution by nitrogen on magnetic and transport properties in Sr2FeMoO6 compound

2012 ◽  
Vol 38 (2) ◽  
pp. 1359-1363 ◽  
Author(s):  
Guoyan Huo ◽  
Jingjuan Wen ◽  
Chenghui Zhang ◽  
Minghui Ren
Keyword(s):  
Transport Properties ◽  
Effect Of Oxygen ◽  
Oxygen Substitution

A study of the properties of hydrogen films on tungsten by the method of contact potentials

1937 ◽  
Vol 33 (3) ◽  
pp. 394-402 ◽  
Author(s):  
R. C. L. Bosworth
Keyword(s):  
Dipole Moment ◽  
Hydrogen Atom ◽  
Gas Phase ◽  
Atomic Hydrogen ◽  
The Other ◽  
Condensation Coefficient ◽  
Effective Dipole Moment ◽  
Tungsten Atom ◽  
Contact Potential ◽  
Hydrogen Molecules

In a study of the properties of hydrogen on tungsten by the method of contact potentials the following points have been established:(1) The contact potential of a 92% covered surface of hydrogen on tungsten against bare tungsten is 1·04 V., and the Richardson constants for such a surface are, approximately,A = 30, b = 5·60 V.(2) A film of deuterium is 20 m V. positive relative to a similar hydrogen film.(3) Over the range of temperatures and pressures used by Bryce in a study of the production of atomic hydrogen the films are nearly saturated, so that the production of atomic hydrogen is primarily due to a molecule striking a bare tungsten atom, one atom being adsorbed and the other going into the gas phase.(4)The condensation coefficient for hydrogen molecules on cold tungsten is 0·01.(5) The effective dipole moment of each hydrogen atom on the surface is −0·42 Debye unit and is independent of the fraction of the surface covered.

scholarly journals Influence of a quasi-molecular mechanism of recombination on the formation of hydrogen in the early Universe

2020 ◽  
Vol 501 (1) ◽  
pp. 1160-1167
Author(s):  
Tamaz Kereselidze ◽  
Irakli Noselidze ◽  
John F Ogilvie
Keyword(s):  
Hydrogen Atom ◽  
Binding Energy ◽  
Molecular Mechanism ◽  
Early Universe ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Molecular Approach ◽  
Evolution Of The Universe ◽  
Radiative Transitions ◽  
The Universe

ABSTRACT In the framework of a quasi-molecular approach, the formation of hydrogen atom in the pre-recombination period of evolution of the Universe is analysed quantitatively. Calculations in an adiabatic multilevel representation enable estimates of probabilities of radiative transitions. The quasi-molecular mechanism of recombination allows the formation of hydrogen molecular ion, ${\mathrm{ H}_2}^+$, in its ground state. The probability of this process is comparable with the probability of the creation of atomic hydrogen. The participation of a second proton in the recombination increases the binding energy of an electron and decreases the rate of recombination of hydrogen.

The kinetics of the interaction of atomic hydrogen with olefines. V. Results obtained for a further series of compounds

1950 ◽  
Vol 202 (1069) ◽  
pp. 181-202 ◽  
Keyword(s):  
Double Bond ◽  
Hydrogen Atom ◽  
Atomic Hydrogen ◽  
Methyl Radicals ◽  
Hydrogen Atoms ◽  
Alkyl Radicals ◽  
Kinetics Of ◽  
Interesting Generalization

In this paper the efficiency of interaction of a hydrogen atom with a series of olefines has been determined, the olefines being members of the series obtained by progressively replacing the hydrogen atoms of ethylene by methyl radicals. The interesting generalization which emerges from this is that the efficiency of interaction does not vary very much with the nature of the alkyl substituents in the molecule, and calculations involving the heats of addition of a hydrogen atom to a double bond confirm this generalization. The data presented here are discussed critically in relation to information available on the reaction of CCl 3 radicals with olefines and of alkyl radicals with olefines, complete general agreement being demonstrated.

scholarly journals The kinetics of the interaction of atomic hydrogen with olefines IV. Results obtained by the foregoing techniques

1949 ◽  
Vol 196 (1047) ◽  
pp. 494-509 ◽  
Keyword(s):  
Double Bond ◽  
Hydrogen Atom ◽  
Atomic Hydrogen ◽  
Experimental Techniques ◽  
Effective Diameter ◽  
Collision Efficiency ◽  
Ethylene Propylene ◽  
Theoretical Considerations ◽  
Kinetics Of ◽  
Effect Of Structure

The experimental techniques and theoretical considerations developed in the previous parts have been utilized in obtaining data on the reactions of the type H + C n H 2 n = C n H 2 n +1 . The olefines used were ethylene, propylene, iso -butene, n -pentene-2 ( cis ), and 2, 3, 3, tri-methyl-butene-1. Certain tentative suggestions as to the effect of structure on the reactivity of the double bond are put forward, but in general, the collision efficiency of a hydrogen atom with an olefine lies between 10 –3 and 10 –4 . It is noted that in the computation of the collision efficiency, it seems to be rather unsatisfactory that the diameter of the whole molecule should be used and it is suggested that perhaps the effective diameter of a more intimate part of the molecule in the region of the double bond should be employed.

Post-polymerization modification of poly(vinyl ether)s: a Ru-catalyzed oxidative synthesis of poly(vinyl ester)s and poly(propenyl ester)s

2016 ◽  
Vol 7 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Di Liu ◽  
Christopher W. Bielawski
Keyword(s):  
Vinyl Ether ◽  
Vinyl Ester ◽  
Mild Conditions

Poly(vinyl ester)s were readily prepared via a ruthenium catalyzed C–H oxidation of the corresponding poly(vinyl ether)s under mild conditions.

Sign in / Sign up

Export Citation Format

Share Document