ISSN:
0749-1581
Schlagwort(e):
Electron spin resonance
;
Electron paramagnetic resonance
;
Free radical
;
π-Radical
;
Heterocyclic free radical
;
g Tensor
;
Hyperfine interaction tensor
;
Nitrogen hyperfine interaction
;
Dithiadiazolyl
;
Dithiadiazolylium
;
Dithiadiazolium
;
Unpaired electron
;
Unpaired electron spin density
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Single crystals of 4-phenyl-1,2,3,5-dithiadiazolium trithiatriazinide , prepared by the reduction of S5N5+AlCl4- in SO2 with , contain a trace paramagnetic impurity which is shown by EPR spectroscopy to be the dithiadiazolyl free radical . The g and 14N hyperfine tensors of the radical were deduced from measurements made throughout three mutually orthogonal planes of crystallographically aligned specimens: g = (2.0011, 2.0075, 2.0197); 14N(2) = (37.1, 11.3, 3.4 MHz.). Within experimental error, the two nitrogen hyperfine interaction tensors are collinear and have their maximum principal value aligned parallel to gmin and perpendicular to the plane of the host cation. The results are interpreted in terms of a planar π-radical which substitutes for the planar host cation, and which has considerable unpaired spin density in N(2px) atomic orbitals directed perpendicular to the heterocyclic ring.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1260271210
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