biostudies-literature00450Unknown102(29)Kobori YPhotoinduced primary charge-separation and charge-recombination are characterized by a combination of time-resolved optical and EPR measurements of a fullerene-porphyrin-linked triad that undergoes fast, stepwise charge-separation processes. The electronic coupling for the energy-wasting charge recombination is evaluated from the singlet-triplet electronic energy gap in the short-lived, primary charge-separated state. The electronic coupling is found to be smaller by approximately 40% than that for the primary charge-separation. This inhibition of the electronic interaction for the charge-recombination to excited triplet state largely results from a symmetry-broken electronic structure modulated by configuration interaction between 3(b1u,b3g) and 3(au, b3g) electronic states of the free-base porphyrin.Proceedings of the National Academy of Sciences of the United States of America10017-22https://www.ebi.ac.uk/biostudies/studies/S-EPMC1177418biostudies-literaturePrimary charge-recombination in an artificial photosynthetic reaction center.PMC1177418Yamauchi SAkiyama KFukuzumi SKobori YImahori HNorris JRTero-Kubota S45falsePrimary charge-recombination in an artificial photosynthetic reaction center.Photoinduced primary charge-separation and charge-recombination are characterized by a combination of time-resolved optical and EPR measurements of a fullerene-porphyrin-linked triad that undergoes fast, stepwise charge-separation processes. The electronic coupling for the energy-wasting charge recombination is evaluated from the singlet-triplet electronic energy gap in the short-lived, primary charge-separated state. The electronic coupling is found to be smaller by approximately 40% than that for the primary charge-separation. This inhibition of the electronic interaction for the charge-recombination to excited triplet state largely results from a symmetry-broken electronic structure modulated by configuration interaction between 3(b1u,b3g) and 3(au, b3g) electronic states of the free-base porphyrin.2005-01-01T00:00:00Z2005 Jul2024-11-10T08:00:10.571Z2019-03-27T01:09:08ZS-EPMC11774181601441310.1073/pnas.0504598102