Abstract
Monomeric protochlorophyllide possesses no intrinsic dark ESR signal, nor can a photo-ESR signal be induced by irradiation with red light. In contrast protochlorophyllide-water aggregates, prepared in benzene, yield a permanent dark signal of low amplitude and a photo-induced reversible ESR signal on irradiation with red light. The effect of light is believed to cause hydrogen atom transfer in the water molecule between two protochlorophyllide molecules. The linewidth of the photo-induced ESR signal (7.5 G) is accounted for by delocalization of the unpaired spin over about two pigment molecules. The dark ESR signal is probably due to the presence of oxygen in the preparations.
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