A Study of the Effect of Solvent and Temperature on the Electron Paramagnetic Resonance Parameters and Linewidths of Copper(II)bis(Diethyldithiocarbamate)

1974 ◽  
Vol 52 (24) ◽  
pp. 4016-4024 ◽  
Author(s):  
F. Geoffrey Herring ◽  
Robert L. Tapping
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Rotational Correlation Time ◽  
Coupling Constant ◽  
Paramagnetic Resonance ◽  
Axial Ligation ◽  
Effect Of Solvent ◽  
Isotropic Hyperfine Coupling ◽  
Electron Paramagnetic

The effect of varying solvent and temperature on the e.s.r. parameters and linewidths of copper(II) bis(diethyldithiocarbamate) has been studied. The temperature and solvent dependences of the isotropic hyperfine coupling constant (a0) have been interpreted in terms of vibronic and axial ligation effects. The rotational correlation time, τR, of Cu(DEDC)2 has been measured in the solvents employed. The values of τR measured at 300 K have been used to obtain the anisotropic interaction parameter, κ, which is found to correlate roughly with the dipole moment and molar refractivity of the solvent.

scholarly journals Electron Paramagnetic Resonance (EPR) Detection of Nitric Oxide Produced during Forebrain Ischemia of the Rat

1994 ◽  
Vol 14 (5) ◽  
pp. 715-722 ◽  
Author(s):  
Teiji Tominaga ◽  
Shinya Sato ◽  
Tomoko Ohnishi ◽  
S. Tsuyoshi Ohnishi
Keyword(s):  
Nitric Oxide ◽  
Electron Paramagnetic Resonance ◽  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Forebrain Ischemia ◽  
Coupling Constant ◽  
Paramagnetic Resonance ◽  
Rat Forebrain ◽  
Electron Paramagnetic

To detect if nitric oxide (NO) is produced in rat forebrain ischemia, we applied an electron paramagnetic resonance (EPR) NO-trapping technique. We also performed a detailed characterization of the technique. Diethyldithiocarbamate (DETC) and Fe-citrate were used as NO-trapping reagents. Under controlled ventilation, forebrain ischemia was produced by occlusion of both carotid arteries combined with hemorrhagic hypotension at 50 mm Hg for 15 min. DETC and Fe were administered 30 min prior to the onset of ischemia. During ischemia, the cerebral cortex was removed, and EPR samples were prepared. At liquid nitrogen temperatures, the NO-Fe-DETC signal (a triplet signal centered at g = 2.039 with the hyperfine coupling constant aN of 13 G) was detected overlapping Cu-DETC signals. By perfusing various concentrations of an NO-generating agent, 1,1-diethyl-2-hydroxy-2-nitrosohydrazine, into the rat brains, the amount of the “trapped NO” was calibrated. The size of the NO-Fe-DETC signal was well correlated with the NO concentrations in the perfusate (correlation coefficient r = 0.998, p < 0.01). Based on this calibration curve, it was found that the amount of trapped NO during forebrain ischemia increased to seven times that of the control (control n = 5, forebrain ischemia n = 4, p < 0.005).

The β-phosphorus hyperfine coupling constant in nitroxide: part 3: titration of water by electron paramagnetic resonance

2015 ◽  
Vol 13 (46) ◽  
pp. 11393-11400 ◽  
Author(s):  
Gérard Audran ◽  
Lionel Bosco ◽  
Paul Brémond ◽  
Teddy Butscher ◽  
Jean-Michel Franconi ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Organic Solvent ◽  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Coupling Constant ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Titration of a few percent of water in an organic solvent is possible due to a large difference in aP.

EPR Data on Ni(II) Doped Cu(II) Acetate Monohydrate Single Crystals: Evidence of Ni2+ — Cu2+ Exchange-Coupled Pairs

1984 ◽  
Vol 39 (11) ◽  
pp. 1061-1065 ◽  
Author(s):  
E. Buluggiu
Keyword(s):  
Single Crystals ◽  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Magnetic Behaviour ◽  
Coupling Constant ◽  
Paramagnetic Resonance ◽  
Strongly Coupled ◽  
Definite Difference ◽  
Electron Paramagnetic ◽  
Made In

Electron paramagnetic resonance measurements on nickel(ll) doped copper(ll) acetate mono­hydrate single crystals have been made. In the liquid helium temperature range, spectra have been observed which may be assigned to Ni2+-Cu2+ strongly coupled mixed pairs in the state of total spin S = 1/2. This result represents a definite difference of magnetic behaviour from the case of the nickel(II) doped dicopper(II) tetra(μ-benzoato-O,O′)bis(quinoline) complex, which has the same sandwich dimeric structure but shows spectra indicative of a S=3/2 state. Apart from this difference, unusual EPR data are found such as pronounced misalignments of g with respect to the relevant pair axes and very large values of the hyperfine coupling constant of the copper nucleus, which characteristically recall that case.

scholarly journals Ro-vibrational averaging of the isotropic hyperfine coupling constant for the methyl radical

2015 ◽  
Vol 143 (24) ◽  
pp. 244306 ◽  
Author(s):  
Ahmad Y. Adam ◽  
Andrey Yachmenev ◽  
Sergei N. Yurchenko ◽  
Per Jensen
Keyword(s):  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Coupling Constant ◽  
Methyl Radical ◽  
Isotropic Hyperfine Coupling
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