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ESR/DFT study of bis‐iminophosphorane cation radicals
Author(s) -
Matni Adil,
Boubekeur Leila,
Grosshans Philippe,
Mézailles Nicolas,
Bernardinelli Gérald,
Le Floch Pascal,
Geoffroy Michel
Publication year - 2007
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.2079
Subject(s) - chemistry , unpaired electron , delocalized electron , radical , electron paramagnetic resonance , hyperfine structure , crystallography , cyclic voltammetry , conjugated system , resonance (particle physics) , photochemistry , organic chemistry , nuclear magnetic resonance , electrochemistry , physics , electrode , quantum mechanics , particle physics , polymer
Abstract Bis‐iminophosphoranes containing various types of linkers between two R 3 PN moieties were electrochemically oxidized at controlled potential in situ in the electron spin resonance (ESR) cavity. For linkers constituted of phenylenes, conjugated phenylenes or merely a dicyanoethylenic bond, this oxidation led to well‐resolved ESR spectra which were characterized by their g values and by their 1 H, 14 N and 31 P isotropic hyperfine constants. These coupling constants agree with those calculated by DFT for the corresponding cation radicals. Experimental and theoretical results clearly indicate that in these species the unpaired electron is mostly delocalized on the bridge and on the nitrogen atoms while the spin density on the phosphorus atoms is particularly small. Cyclic voltammetry and ESR spectra show that the nature of the bridge between the two iminophosphoranes considerably influences the oxidation potential of the compound as well as the stability of the radical cation. Information about the conformation of the precursor containing two Ph 3 PN moieties separated by a C(CN)C(CN)group was obtained from its crystal structure. Copyright © 2007 John Wiley & Sons, Ltd.