Abstract
Potential photosynthetic models, porphyrin dyads with various acceptors, that are separated by a diazaphenylene spacer, are synthesized by a new strategy. The amidine and vinamidinium salts are coupled by pyrimidine rings. In one example (n=1 in the figure), excitation of a flavin acceptor results in energy transfer to the porphyrin singlet (≈60 %) and population of a charge-separated state (≈40 %), which relaxes to the ground state on a subnanosecond time scale.
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