Show simple item record

dc.contributorWichita State University. Department of Chemistryen_US
dc.contributor.authorD'Souza, Francisen_US
dc.contributor.authorDeviprasad, Gollapalli R.en_US
dc.contributor.authorEl-Khouly, Mohamed E.en_US
dc.contributor.authorFujitsuka, Mamoruen_US
dc.contributor.authorIto, Osamuen_US
dc.identifier.citationJournal of the American Chemical Society. 2001 Jun 6; 123(22): 5277-84.en_US
dc.descriptionFull text of this article is not available in SOAR.en_US
dc.description.abstractA 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.en_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofseriesJournal of the American Chemical Societyen_US
dc.relation.ispartofseriesJ. Am. Chem. Soc.en_US
dc.titleProbing the donor-acceptor proximity on the physicochemical properties of porphyrin-fullerene dyads: "tail-on" and "tail-off" binding approachen_US
dc.coverage.spacialUnited Statesen_US
dc.description.versionpeer revieweden_US
dc.rights.holderCopyright © 2001 American Chemical Societyen_US

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record