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13 C NMR studies on radical anions. Special solvent effects
Author(s) -
Doctorovich Fabio,
Nudelman N. S.
Publication year - 1990
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260280704
Subject(s) - chemistry , tetrahydrofuran , ion , molecule , solvent , benzene , radical ion , relaxation (psychology) , photochemistry , computational chemistry , organic chemistry , social psychology , psychology
The determination of radical ions is crucial in mechanistic studies of reactions in which single electron transfer is suspected. A 13 C 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, T 1 , and of the transverse nuclear, T 2 , 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.