Browsing CHEM Faculty Scholarship by Author "Fukuzumi, Shunichi"
Now showing items 1-17 of 17
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Anion-complexation-induced stabilization of charge separation
D'Souza, Francis; Subbaiyan, Navaneetha K.; Xie, Yongshu; Hill, Jonathan P.; Ariga, Katsuhiko; Ohkubo, Kei; Fukuzumi, Shunichi (American Chemical Society, 2009-11-11)A supramolecular oligochromophoric system possessing exclusive binding sites for both a guest electron acceptor and an anionic cofactor species is developed, and anion-binding-induced stabilization of the charge-separated ... -
Bisdonor-azaBODIPY-fullerene supramolecules: syntheses, characterization, and light-Induced electron-transfer studies
Bandi, Venugopal; El-Khouly, Mohamed E.; Ohkubo, Kei; Nesterov, Vladimir N.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (American Chemical Society, 2014-02-06)Achieving ultrafast light-induced charge separation requires carefully selected donor and acceptor entities often held together in a closer proximity. In the present investigation, two tetrads featuring a near-IR-emitting ... -
Charge stabilization in a closely spaced ferrocene-boron dipyrrin-fullerene triad
Wijesinghe, Channa A.; El-Khouly, Mohamed E.; Blakemore, James D.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (Royal Society of Chemistry, 2010-05-21)New molecular triads composed of closely spaced ferrocene-boron dipyrrin-fullerene, 1 and triphenylamine-boron dipyrrin-fullerene, 2 are synthesized, and photoinduced electron transfer leading to charge stabilization is ... -
A charge-stabilizing, multimodular, ferrocene-bis(triphenylamine)-zinc-porphyrin-fullerene polyad
Wijesinghe, Channa A.; El-Khouly, Mohamed E.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2013-07-15)A novel multimodular donor-acceptor polyad featuring zinc porphyrin, fullerene, ferrocene, and triphenylamine entities was designed, synthesized, and studied as a charge-stabilizing, photosynthetic-antenna/reaction-center ... -
Control over photoinduced energy and electron transfer in supramolecular polyads of covalently linked azaBODIPY-bisporphyrin ‘molecular clip’ hosting fullerene
D'Souza, Francis; Amin, Anu N.; El-Khouly, Mohamed E.; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Fukuzumi, Shunichi (American Chemical Society, 2012-01)A '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 ... -
Corrole-fullerene dyads: formation of long-lived charge-separated states in nonpolar solvents
D'Souza, Francis; Chitta, Raghu; Ohkubo, Kei; Tasior, Mariusz; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Rogacki, Maciek K.; Gryko, Daniel T.; Fukuzumi, Shunichi (American Chemical Society, 2008-10-29)The first example of covalently linked free-base corrole-fullerene dyads is reported. In the newly synthesized dyads, the free-energy calculations performed by employing the redox and singlet excited-state energy in both ... -
Enhanced photocurrents via redox modulation by fluoride binding to oxoporphyrinogen in a zinc porphyrin-oxoporphyrinogen surface modified TiO2 supramolecular solar cell
Subbaiyan, Navaneetha K.; Hill, Jonathan P.; Ariga, Katsuhiko; Fukuzumi, Shunichi; D'Souza, Francis (Royal Society of Chemistry, 2011-06-07)A novel approach for improving photocurrent in a supramolecular solar cell, composed of zinc porphyrin-oxoporphyrinogen (ZnP-OxP) surface-modified TiO(2), by redox tuning through fluoride anion binding to the redox active ... -
Excitation-wavelength-dependent, ultrafast photoinduced electron transfer in bisferrocene/bf2-chelated-azadipyrromethene/fullerene tetrads
Bandi, Venugopal; El-Khouly, Mohamed E.; Ohkubo, Kei; Nesterov, Vladimir N.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (John Wiley and Sons, 2013-05-27)Donor–acceptor distance, orientation, and photoexcitation wavelength are key factors in governing the efficiency and mechanism of electron-transfer reactions both in natural and synthetic systems. Although distance and ... -
Face-to-face pacman-type porphyrin-fullerene dyads: design, synthesis, charge-transfer interactions, and photophysical studies
D'Souza, Francis; Maligaspe, Eranda; Karr, Paul A.; Schumacher, Amy Lea; El Ojaimi, Maya; Gros, Claude P.; Barbe, Jean-Michel; Ohkubo, Kei; Fukuzumi, Shunichi (John Wiley and Sons, 2008-01-01)Pacman-type face-to-face zinc-porphyrin-fullerene dyads have been newly synthesized and studied. Owing to the close proximity of the donor and acceptor entities, strong pi-pi intramolecular interactions between the porphyrin ... -
Metal quinolinolate-fullerene(s) donor-acceptor complexes: evidence for organic LED molecules acting as electron donors in photoinduced electron-transfer reactions
D'Souza, Francis; Maligaspe, Eranda; Zandler, Melvin E.; Subbaiyan, Navaneetha K.; Ohkubo, Kei; Fukuzumi, Shunichi (American Chemical Society, 2008-12-17)Tris(quinolinolate)aluminum(III) (AlQ3) is the most widely used molecule in organic light-emitting devices. There exists a strong demand for understanding the photochemical and photophysical events originating from this ... -
Near-IR excitation transfer and electron transfer in a BF2-chelated dipyrromethane-azadipyrromethane dyad and triad
El-Khouly, Mohamed E.; Amin, Anu N.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (WILEY-V C H VERLAG GMBH, 2012-04)A molecular dyad and triad, comprised of a known photosensitizer, BF2-chelated dipyrromethane (BDP), covalently linked to its structural analog and near-IR emitting sensitizer, BF2-chelated tetraarylazadipyrromethane (ADP), ... -
A novel BF(2)-chelated azadipyrromethene-fullerene dyad: synthesis, electrochemistry and photodynamics
Amin, Anu N.; El-Khouly, Mohamed E.; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (Royal Society of Chemistry, 2012)The synthesis, structure, electrochemistry and photodynamics of a BF2-chelated azadipyrromethene–fullerene dyad are reported in comparison with BF2-chelated azadipyrromethene without fullerene. The attachment of fullerene ... -
Photochemical charge separation in closely positioned donor-boron dipyrrin-fullerene triads
Wijesinghe, Channa A.; El-Khouly, Mohamed E.; Subbaiyan, Navaneetha K.; Supur, Mustafa; Zandler, Melvin E.; Ohkubo, Kei; Fukuzumi, Shunichi; D'Souza, Francis (John Wiley and Sons, 2011-02-14)A series of molecular triads, composed of closely positioned boron dipyrrin-fullerene units, covalently linked to either an electron donor (donor(1) -acceptor(1) -acceptor(2) -type triads) or an energy donor (antenna-donor(1) ... -
Photosynthetic reaction center mimicry: low reorganization energy driven charge stabilization in self-assembled cofacial zinc phthalocyanine dimer-fullerene conjugate
D'Souza, Francis; Maligaspe, Eranda; Ohkubo, Kei; Zandler, Melvin E.; Subbaiyan, Navaneetha K.; Fukuzumi, Shunichi (American Chemical Society, 2009-07-01)By employing well-defined self-assembly methods, a biomimetic bacterial photosynthetic reaction center complex has been constructed, and photoinduced electron transfer originating in this supramolecular donor-acceptor ... -
Review -- Two different multiple photosynthetic reaction centers using either zinc porphyrinic oligopeptide-fulleropyrrolidine or free-base porphyrinic polypeptide-Li+@C60supramolecular complexes
Solladie, Nathalie; Fukuzumi, Shunichi; Ohkubo, Kei; D'Souza, Francis; Rein, Regis; Saito, Kenji; Troiani, Vincent; Qiu, Hongjin; Gadde, Suresh; Hasegawa, Tetsuya (Institute of Physics Publishing, 2020-08-10)An overview of two successful examples of photosynthetic reaction center models combined with light-capturing antenna chromophores is presented. In the first example, supramolecular complexes are formed between flexible ... -
Syntheses, electrochemistry, and photodynamics of ferrocene-azadipyrromethane donor--acceptor dyads and triads
Amin, Anu N.; El-Khouly, Mohamed E.; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Supur, Mustafa; Fukuzumi, Shunichi; D'Souza, Francis (American Chemical Society, 2011-09-08)A near-IR-emitting sensitizer, boron-chelated tetraarylazadipyrromethane, has been utilized as an electron acceptor to synthesize a series of dyads and triads linked with a well-known electron donor, ferrocene. The structural ... -
Ultrafast photoinduced energy and electron transfer in multi-modular donor-acceptor conjugates
El-Khouly, Mohamed E.; Wijesinghe, Channa A.; Nesterov, Vladimir N.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis (Wiley-Blackwell, 2012-10)New multi-modular donoracceptor conjugates featuring zinc porphyrin (ZnP), catechol-chelated boron dipyrrin (BDP), triphenylamine (TPA) and fullerene (C60), or naphthalenediimide (NDI) have been newly designed and synthesized ...