Electron spin resonance study of SO2 and CO on CuO–alumina

1982 ◽  
Vol 60 (18) ◽  
pp. 2340-2341 ◽  
Author(s):  
K. C. Khulbe ◽  
R. S. Mann
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Alumina Catalyst ◽  
Treated Sample ◽  
Spin Resonance ◽  
Spin Resonance Study

The intensity of the Cu2+ esr signal increased significantly on the addition of CO or SO2, especially with SO2, at room temperature to the preheated (at 400 °C) and evacuated CuO–alumina catalyst. When the CO or SO2 treated sample was evacuated at room temperature, the shape and intensity of the Cu2+ esr line returned to their original values. The intensity of the Cu2+ esr line decreased, but not to zero, on heating CuO–alumina either with CO or SO2. In the case of SO2, a new line appeared for the [Formula: see text] ion which was not affected on evacuation. It seems that the [Formula: see text] do not take part in the reduction of SO2 with CO over the CuO–alumina catalyst.

Electron spin resonance study of the copper(II) chelates of certain thio ligands

1970 ◽  
Vol 23 (11) ◽  
pp. 2287 ◽  
Author(s):  
JR Pilbrow ◽  
TD Smith ◽  
AD Toy
Keyword(s):  
Electron Spin Resonance ◽  
Carboxylic Acid ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Frozen Solution ◽  
Simulation Procedure ◽  
Spin Resonance ◽  
Frozen Solutions ◽  
Spin Resonance Study

Electron spin resonance measurements have been made on the copper(II) chelates of o-methylmercaptobenzoic acid, S-carboxydiethyldithiocarbamic acid, thiazolidine-4-carboxylic acid, 5-hydroxy-1,3-benzoxathiol-2-one and diacetyl bisthiosemicarbazone. The e.s.r. spectra of dimethylformamide solutions of the chelates have been interpreted in terms of dimeric species which are believed to exist at room temperature, as well as in frozen solutions in the case of o-methyl-mercaptobenzoic acid, S-carboxydiethyldithiocarbamic acid, and 5-hydroxy-1,3-benzoxathiol-2-one, whereas the dimeric forms of the remaining chelates are formed solely in frozen solution. The results have been interpreted as arising from dipole-dipole coupling between the copper(II) ions in their dimeric forms, and a line simulation procedure employed to extract the distance between the copper(II) dipoles. This information has been used to suggest the possible structures of the dimeric species. The effect of the introduction of zinc(II) ions during the formation of the copper(II) chelates has been assessed in each case.

An electron spin resonance study of organomercury adducts of phenanthroquinont

1978 ◽  
Vol 56 (19) ◽  
pp. 2503-2507 ◽  
Author(s):  
Kuang S. Chen ◽  
Richard T. Smith ◽  
Jeffrey K. S. Wan
Keyword(s):  
Electron Spin Resonance ◽  
Exchange Reaction ◽  
Electron Spin ◽  
Room Temperature ◽  
Ion Pairs ◽  
Electron Spin Resonance Study ◽  
Methyl Proton ◽  
Potential Value ◽  
Spin Resonance ◽  
Spin Resonance Study

The exchange reaction between M+PQ−• ion-pairs and MeHgCl leads to the formation of MeHgPQ• adduct with a characteristic low g-factor of 2.00052 and a small methyl proton splittings of 0.16 G. The dynamic and equilibrium aspects of the exchange depend upon the alkali cation, the concentration of MeHgCl, and for M+PQ−• also on temperature. The MeHgPQ• is found to be relatively stable at room temperature and in the presence of water. These results may be of potential value to toxicology studies of methylmercury.

AN ELECTRON SPIN RESONANCE STUDY OF MANGANESE IMPURITY IN BRUCITE

1961 ◽  
Vol 39 (1) ◽  
pp. 145-157 ◽  
Author(s):  
W. A. Pieczonka ◽  
H. E. Petch ◽  
A. B. McLay
Keyword(s):  
Absorption Spectrum ◽  
Electron Spin Resonance ◽  
Single Crystal ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Spin Hamiltonian ◽  
Air Temperatures ◽  
Spin Resonance ◽  
Spin Resonance Study

A single crystal of brucite, Mg(OH)2, containing manganese impurity to the extent of 100 parts per million, has been studied by means of the electron spin resonance (esr) technique. The study was made at room and liquid air temperatures. The observed absorption spectrum has been successfully interpreted in terms of parameters found in the appropriate spin-Hamiltonian. The measured values of these parameters at room temperature were found to be:[Formula: see text]

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