Pub No:
44
Title:
π-Radical Ions from the Oxidation and Reduction of Chlorins, Chlorophyll, and Bacteriochlorophyll
Authors:
Borg, D.C., Fajer, J., Forman, A., Felton, R.H., and David Dolphin
Journal:
Proc. 4th Int. Biophys. Congress (Moscow)
Year:
1973
Pages:
2, 528-538
Abstract:
LPR spectra with g-values of 2.0025 and peak-to-peak line widths of about 9 gauss were measured which compares with widths of 6 to 7 gauss and similar g-values reported for light EPR-induced EPR signals in green plants. We believe this difference reflects a special environment in vivo, and the postulation of Norris et al. that the free radical cation within the photoconversion center of chloroplasts is a partner in a bridged chlorophyll dimer provides an attractive explanation for the difference. Rapid electron or hole exchange between the two chlorophylls of such a dimer could account for the narrowing of EPR line width could also underlie a red shift in the optical absorption spectrum

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