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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3388
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dc.contributor.authorJustin Thomas, K. R.-
dc.contributor.authorThompson A.L.-
dc.contributor.authorSivakumar A.V.-
dc.contributor.authorBardeen C.J.-
dc.contributor.authorThayumanavan S.-
dc.date.accessioned2020-10-06T14:26:34Z-
dc.date.available2020-10-06T14:26:34Z-
dc.date.issued2005-
dc.identifier.citationJournal of the American Chemical Society (2005), 127(1): 373-383-
dc.identifier.issn27863-
dc.identifier.urihttps://doi.org/10.1021/ja044778m-
dc.identifier.urihttp://repository.iitr.ac.in/handle/123456789/3388-
dc.description.abstractNonconjugated dendrimers, which are capable of tunneling energy from the periphery to the core followed by a charge-transfer process from the core to the periphery, have been synthesized. The energy and electron donors involve a diarylaminopyrene unit and are incorporated at the periphery of these dendrimers. The energy and electron acceptor is at the core of the dendrimer, which involves a chromophore based on a benzthiadiazole moiety. The backbone of the dendrimers is benzyl ether based. A direct electron-transfer quenching of the excited state of the periphery or a sequential energy transfer - electron-transfer pathway are the two limiting mechanisms of the observed photophysical properties. We find that the latter mechanism is prevalent in these dendrimers. The energy transfer occurs on a picosecond time scale, while the charge-transfer process occurs on a nanosecond time scale. The lifetime of the charge separated species was found to be in the range of microseconds. Energy transfer efficiencies ranging from 80% to 90% were determined using both steady-state and time-resolved measurements, while charge-transfer efficiencies ranging from 70% to 80% were deduced from fluorescence quenching of the core chromophore. The dependence of the energy and charge-transfer processes on dendrimer generation is analyzed in terms of the backfolding of the flexible benzyl ether backbone, which leads to a weaker dependence of the energy and charge-transfer efficiencies on dendrimer size than would be expected for a rigid system.-
dc.language.isoen_US-
dc.relation.ispartofJournal of the American Chemical Society-
dc.titleEnergy and electron transfer in bifunctional non-conjugated dendrimers-
dc.typeArticle-
dc.scopusid57203389297-
dc.scopusid7404597385-
dc.scopusid8768028400-
dc.scopusid7003840634-
dc.scopusid57203195779-
dc.affiliationThomas, K.R.J., Department of Chemistry, University of Massachusetts, Amherst, MA 01003, United States-
dc.affiliationThompson, A.L., Department of Chemistry, University of Illinois, Urbana, IL 61801, United States-
dc.affiliationSivakumar, A.V., Department of Chemistry, University of Massachusetts, Amherst, MA 01003, United States-
dc.affiliationBardeen, C.J., Department of Chemistry, University of Illinois, Urbana, IL 61801, United States-
dc.affiliationThayumanavan, S., Department of Chemistry, University of Massachusetts, Amherst, MA 01003, United States-
dc.description.correspondingauthorBardeen, C.J.; Department of Chemistry, University of Massachusetts, Amherst, MA 01003, United States; email: bardeen@scs.uiuc.edu-
Appears in Collections:Journal Publications [CY]

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