ISSN:
0749-1581
Schlagwort(e):
Radical anions
;
Benzophenone ketyl
;
Aryllithiums
;
Electron transfer
;
Spin density transfer
;
Ternary ‘inner sphere’ complex
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The determination of radical ions is crucial in mechanistic studies of reactions in which single electron transfer is suspected. A 13C NMR method based on the interaction of radical anions with tetrahydrofuran (THF) molecules is presented; measurements of the broadening of the THF α-carbon signal allow determination of the substrate concentration in the range 0.2-1.2 M. The spectacular effect observed on addition of small amounts of benzene greatly improved the method. In addition, studies of the spin-lattice, T1, and of the transverse nuclear, T2, relaxation times and of the effects of added co-solvents allow the proposal of the bonding situation and of the degree of coordination in the radical anion-cation-THF molecules' complex.
Zusätzliches Material:
2 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1260280704
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