Quinones covalently linked with porphyrin like 1 are suitable for investigating light-induced charge separation in the primary process of photosynthesis. The orientation of the ring units was determined by NOE and ENDOR measurements on the Zn-cyclohexylporphyrin and cyclohexylquinone. Detailed MO calculations on Zn-1 and picosecond fluorescence measurements gave satisfactorily consistent rate constants for the electron transfer from the prophyrin to the quinone.
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Gersdorff et al. (1990) studied this question.
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