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EPR Study of Cation Radicals of Short Chain Polyenes
Author(s) -
Prasad L. Sreeramachandra,
Ding Ruisong,
Bradford Eric G.,
Kispert Lowell D.,
Wang Hanqing
Publication year - 1989
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198900006
Subject(s) - chemistry , electron paramagnetic resonance , radical , polyene , hyperfine structure , photochemistry , unpaired electron , crystallography , coupling constant , computational chemistry , nuclear magnetic resonance , organic chemistry , atomic physics , physics , particle physics
Short chain polyene cation diene and triene radicals generated by X‐ray irradiation of different polyenes diluted in a CFCl 3 matrix have been detected by EPR and the magnitudes of the g and isotropic hyperfine coupling constants have been obtained. The structure of the resulting cation radicals were deduced by comparing the experimental coupling constants to those derived from an INDO calculation. An estimate was obtained of the unpaired spin density as a function of chain length, suggesting that resolved hyperfine structure in the EPR spectra of long chain carotenoid cation radicals should not be observed.