Abstract
The triplet state zero-field splittings and individual spin sublevel decay rates have been determined for a series of chlorophyll b molecules at 2 K by optically detected zero-field magnetic resonance. By detecting the microwave-induced changes in fluorescence intensity the triplet states of pheophytin b, calcium chlorophyll b, and cadmium chlorophyll b were investigated. A comparison of the triplet intersystem crossing rates in these systems, as well as chlorophyll b derivatives previously published, suggests that the nonradiative deactivation of chlorophylls may be understood by consideration of the effect of metal center interaction on the spin-orbit coupling centered on the pyrrole nitrogens of the chlorophyll ring.
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