Control over photoinduced energy and electron transfer in supramolecular polyads of covalently linked azaBODIPY-bisporphyrin ‘molecular clip’ hosting fullerene

dc.contributor.authorD'Souza, Francis
dc.contributor.authorAmin, Anu N.
dc.contributor.authorEl-Khouly, Mohamed E.
dc.contributor.authorSubbaiyan, Navaneetha K.
dc.contributor.authorZandler, Melvin E.
dc.contributor.authorFukuzumi, Shunichi
dc.descriptionClick on the DOI link below to access the article (may not be free).en_US
dc.description.abstractA 'molecular clip' featuring a near-IR emitting fluorophore, BF(2)-chelated tetraarylazadipyrromethane (aza-BODIPY) covalently linked to two porphyrins (MP, M = 2H or Zn) has been newly synthesized to host a three-dimensional electron acceptor fullerene via a 'two-point' metal-ligand axial coordination. Efficient singlet-singlet excitation transfer from (1)ZnP* to aza-BODIPY was witnessed in the dyad and triad in nonpolar and less polar solvents, such as toluene and o-dichlorobenzene, however, in polar solvents, additional electron transfer occurred along with energy transfer. A supramolecular tetrad was formed by assembling bis-pyridine functionalized fullerene via a 'two-point' metal-ligand axial coordination, and the resulted complex was characterized by optical absorption and emission, computational, and electrochemical methods. Electron transfer from photoexcited zinc porphyrin to C(60) is witnessed in the supramolecular tetrad from the femtosecond transient absorption spectral studies. Further, the supramolecular polyads (triad or tetrad) were utilized to build photoelectrochemical cells to check their ability to convert light into electricity by fabricating FTO/SnO(2)/polyad electrodes. The presence of azaBODIPY and fullerene entities of the tetrad improved the overall light energy conversion efficiency. An incident photon-to-current conversion efficiency of up to 17% has been achieved for the tetrad modified electrode.en_US
dc.description.versionPeer reviewed article
dc.identifier.citationD’Souza, Francis, Anu N. Amin, Mohamed E. El-Khouly, Navaneetha K. Subbaiyan, Melvin E. Zandler, and Shunichi Fukuzumi. 2012. "Control over Photoinduced Energy and Electron Transfer in Supramolecular Polyads of Covalently linked azaBODIPY-Bisporphyrin ‘Molecular Clip’ Hosting Fullerene". Journal of the American Chemical Society. 134 (1): 654-664.en_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofseriesJournal of the American Chemical Society;
dc.rights.holderCopyright © 2011 American Chemical Society
dc.titleControl over photoinduced energy and electron transfer in supramolecular polyads of covalently linked azaBODIPY-bisporphyrin ‘molecular clip’ hosting fullereneen_US
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