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• W2008768698 abstract "A new approach of probing proximity effects in porphyrin-fullerene dyads by using an axial ligand coordination controlled tail-on and tail-off binding mechanism is reported. In the newly synthesized porphyrin-fullerene dyads for this purpose, the donor-acceptor proximity is controlled either by temperature variation or by an axial ligand replacement method. In o-dichlorobenzene, 0.1 M (TBA)ClO(4), the synthesized zincporphyrin-fullerene dyads exhibit seven one-electron reversible redox reactions within the accessible potential window of the solvent and the measured electrochemical redox potentials and UV-visible absorption spectra reveal little or no ground-state interactions between the C(60) spheroid and porphyrin pi-system. The proximity effects on the photoinduced charge separation and charge recombination are probed by both steady-state and time-resolved fluorescence techniques. It is observed that in the tail-off form the charge-separation efficiency changes to some extent in comparison with the results obtained for the tail-on form, suggesting the presence of some through-space interactions between the singlet excited zinc porphyrin and the C(60) moiety in the tail-off form. The charge separation rates and efficiencies are evaluated from the fluorescence lifetime studies. The charge separation via the singlet excited states of zinc porphyrin in the studied dyads is also confirmed by the quick rise-decay of the anion radical of the C(60) moiety within 20 ns. Furthermore, a long-lived ion pair with lifetime of about 1000 ns is also observed in the investigated zinc porphyrin-C(60) dyads." @default.
• W2008768698 created "2016-06-24" @default.
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• W2008768698 date "2001-05-11" @default.
• W2008768698 modified "2023-10-16" @default.
• W2008768698 title "Probing the Donor−Acceptor Proximity on the Physicochemical Properties of Porphyrin−Fullerene Dyads: “Tail-On” and “Tail-Off” Binding Approach" @default.
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• W2008768698 doi "https://doi.org/10.1021/ja010356q" @default.
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