Electron spin resonance spectra of frozen solutions of potassium and rubidium in hexamethylphosphoramide

1975 ◽  
pp. 96 ◽  
Author(s):  
Ron Catterall ◽  
Peter P. Edwards
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Resonance ◽  
Frozen Solutions

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

Synthesis and electron spin resonance studies of a Co(II) complex with a tetradentate macrocyclic Schiff base ligand

1977 ◽  
Vol 55 (1) ◽  
pp. 70-75 ◽  
Author(s):  
Amikam Reuveni ◽  
Vincenzo Malatesta ◽  
Bruce R. McGarvey
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Ground State ◽  
Molar Ratio ◽  
Lewis Bases ◽  
Spin Resonance ◽  
Frozen Solutions ◽  
Hamiltonian Parameters ◽  
Simulation Of Spectra ◽  
Macrocyclic Schiff Base

The synthesis, physical properties, and electron spin resonance of frozen solutions of CoTAAB(NO3)2 (TAAB = tetrabenzo[b,f,j,n] [1,5,9,13]tetraazacyclohexadecine) are reported. The spin Hamiltonian parameters were elucidated by simulation of spectra assuming axial g and 59Co hyperfine tensors and including nuclear quadrupole and Zeeman contributions. Electron spin resonance spectra in solvents such as methanol, acetone, and dimethylformamide are typical for a low spin complex (S = 1/2) and are nearly identical with [Formula: see text] and [Formula: see text]. In pyridine and quinoline a complex with a molar ratio solvent/ligand of 1:1 is formed with the solvent which gives [Formula: see text]and [Formula: see text] much closer to [Formula: see text]. In strong Lewis bases, such as piperidine, a 2:1 complex is formed and no esr signal is found. Evidence is presented to show that these 2:1 complexes with strong Lewis bases are S = 1/2 complexes with a low lying S = 3/2 state that is partially populated at room temperatures. This behaviour is accounted for in terms of a theory derived for a 2A1 ground state with a low lying quartet state which could become the ground state in strong basic solvents.

Electron spin resonance of nitrogen dioxide in frozen solutions

1968 ◽  
Vol 72 (5) ◽  
pp. 1721-1725 ◽  
Author(s):  
B. H. J. Bielski ◽  
J. J. Freeman ◽  
J. M. Gebicki
Keyword(s):  
Electron Spin Resonance ◽  
Nitrogen Dioxide ◽  
Electron Spin ◽  
Spin Resonance ◽  
Frozen Solutions

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.

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