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

An Electron Spin Resonance Study of the Reaction of Nitrogen Dioxide with Metal Acetylacetonates

1973 ◽  
Vol 51 (24) ◽  
pp. 4072-4075 ◽  
Author(s):  
William H. Wolodarsky ◽  
Joshua Faniran ◽  
Jeffrey K. S. Wan
Keyword(s):  
Electron Spin Resonance ◽  
Nitrogen Dioxide ◽  
Electron Spin ◽  
Electron Spin Resonance Study ◽  
Organic Radical ◽  
Metal Acetylacetonates ◽  
Π Complex ◽  
Spin Resonance ◽  
Lower Oxidation ◽  
Spin Resonance Study

The reaction of nitrogen dioxide with several metal acetylacetonates was studied by electron spin resonance. Those metal complexes that have stable lower oxidation state, (i.e. Cu(II), Fe(III), Co(III), and VO(II)) react to form iminoxy radicals, while those metals not readily reduced (i.e. Zn(II), Cr(III), and Ce(III)) do not give iminoxy radicals. On the basis of the e.s.r. results, a simple mechanism was proposed to account for the formation of iminoxyacetylacetone radicals. A low temperature study of the e.s.r. spectra of the iminoxy-Cu(II)hexafluoroacetylacetonate suggested that a π-complex is formed between the organic radical and the Cu(II) compound.

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.

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