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 the copper(II) complexes of Tris(hydroxymethyl) aminomethane formed in aqueous and non-aqueous solution

1971 ◽  
Vol 24 (1) ◽  
pp. 59 ◽  
Author(s):  
PDW Boyd ◽  
JR Pilbrow ◽  
TD Smith
Keyword(s):  
Aqueous Solution ◽  
Computer Simulation ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Frozen Solution ◽  
Low Field ◽  
Spin Resonance ◽  
Spin Resonance Study

The electron spin resonance spectra of copper(II)- tris(hydroxymethyl)amino-methane complexes in aqueous solution provides evidence of the formation of dimeric species. These species are found to be different from those postulated by previous investigations. In dimethylformamide dimeric species are formed at room temperature and frozen solution in 1 : 1 and 1 : 2 metal-to-ligand mole ratios, though the formation of the dimer is critically dependent on the addition of base. Low field, ΔM = 2, signals observed for these systems have been interpreted in terms of dipole-dipole coupling between pairs of copper(II) ions. Structures for the copper(II) dimers have been proposed which are compatible with the copper-copper separation estimated by computer simulation of the spectra.

Equilibria of 3-Pyridylmethanol with Copper(II). A Comparative Electron Spin Resonance Study by the Decomposition of Spectra in Liquid and Frozen Solutions

2008 ◽  
Vol 112 (41) ◽  
pp. 10280-10286 ◽  
Author(s):  
Rastislav Šípoš ◽  
Terézia Szabó-Plánka ◽  
Antal Rockenbauer ◽  
Nóra Veronika Nagy ◽  
Jozef Šima ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Electron Spin Resonance Study ◽  
Spin Resonance ◽  
Frozen Solutions ◽  
Comparative Electron ◽  
Spin Resonance Study

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.

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