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Self-assembled single-walled carbon nanotube:zinc-porphyrin hybrids through ammonium ion-crown ether interaction: construction and electron transfer

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dc.contributor Wichita State University. Department of Chemistry en_US
dc.contributor.author D'Souza, Francis en_US
dc.contributor.author Chitta, Raghu en_US
dc.contributor.author Sandanayaka, Atula S. D. en_US
dc.contributor.author Subbaiyan, Navaneetha K. en_US
dc.contributor.author D'Souza, Lawrence en_US
dc.contributor.author Araki, Yasuyaki en_US
dc.contributor.author Ito, Osamu en_US
dc.date.accessioned 2012-02-06T17:16:33Z
dc.date.available 2012-02-06T17:16:33Z
dc.date.issued 2007-01-01 en_US
dc.identifier 17625800 en_US
dc.identifier 9513783 en_US
dc.identifier.citation Chemistry (Weinheim an der Bergstrasse, Germany). 2007; 13(29): 8277-84. en_US
dc.identifier.issn 0947-6539 en_US
dc.identifier.uri http://dx.doi.org/10.1002/chem.200700583 en_US
dc.identifier.uri http://hdl.handle.net/10057/4333
dc.description Click on the DOI link below to access the article (may not be free). en_US
dc.description.abstract An ammonium ion-crown ether interaction has been successfully used to construct porphyrin-single-walled carbon nanotube (SWNT) donor-acceptor hybrids. The [18]crown-6 to alkyl ammonium ion binding strategy resulted in porphyrin-SWNT nanohybrids that are stable and soluble in DMF. The porphyrin-SWNT hybrids were characterized by spectroscopic, TEM, and electrochemical techniques. Both steady-state and time-resolved emission studies revealed efficient quenching of the singlet excited state of the porphyrins and free-energy calculations suggested that electron-transfer quenching occurred. Nanosecond transient absorption spectral results supported the charge-separation quenching process. Charge-stabilization was also observed for the nanohybrids in which the lifetime of the radical ion pairs was around 100 ns. The present nanohybrids were also used to reduce the hexyl viologen dication (HV2+) and to oxidize 1-benzyl-1,4-dihydronicotinamide in solution in an electron-pooling experiment. Accumulation of the radical cation (HV.+) was observed in high yields, which provided additional proof for the occurrence of photoinduced charge separation. The present study demonstrates that a hydrogen-bonding motif is a successful self-assembly method to build SWNTs bearing donor-acceptor nanohybrids, which are useful for light-energy harvesting and photovoltaic applications. en_US
dc.format.extent 8277-84 en_US
dc.language.iso eng en_US
dc.publisher John Wiley and Sons en_US
dc.relation.ispartofseries Chemistry (Weinheim an der Bergstrasse, Germany) en_US
dc.relation.ispartofseries Chemistry en_US
dc.source NLM en_US
dc.title Self-assembled single-walled carbon nanotube:zinc-porphyrin hybrids through ammonium ion-crown ether interaction: construction and electron transfer en_US
dc.type Article en_US
dc.coverage.spacial Germany en_US
dc.description.version peer reviewed en_US
dc.rights.holder Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim en_US

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