Browsing by Author "D'Souza, Francis"
Now showing items 1-20 of 89
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4-oxocyclohexadienylidene porphyrinogen as an electrochemical anion receptor
Schumacher, Amy Lea; D'Souza, Francis (Wichita State University. Graduate School., 2007-04-27)Sensitive and selective detection of biologically and environmentally important anions has been a vast growing field in supramolecular chemistry [1,2]. Much research has been devoted to designing sensors that can selectively ... -
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 ... -
Binding, electrochemical activation, and cleavage of DNA by cobalt(II) tetrakis-N-methylpyridyl porphyrin and its beta-pyrrole brominated derivative
Yellappa, Shivaraj; Seetharamappa, Jaldappagari; Rogers, Lisa M.; Chitta, Raghu; Singhal, Ram P.; D'Souza, Francis (American Chemical Society, 2006-11-01)The binding of nucleic acids by water-soluble cobalt(II) tetrakis-N-methylpyridyl porphyrin, (TMPyP)Co, and its highly electron-deficient derivative cobalt(II) tetrakis-N-methyl pyridyl-beta-octabromoporphyrin, (Br(8)TMPyP)Co, ... -
Biomimetic solar cells
Subbaiyan, Navaneetha K. (Wichita State University. Graduate School, 2010-04-23)Eco friendly energy resources are becoming important due to the predicted oil depletion and soared CO₂ emission. Of available alternatives, solar energy finds special attention due to its vast availability and high power ... -
Bionano donor-acceptor hybrids of porphyrin, ssDNA, and semiconductive single-wall carbon nanotubes for electron transfer via porphyrin excitation
D'Souza, Francis; Das, Sushanta K.; Zandler, Melvin E.; Sandanayaka, Atula S. D.; Ito, Osamu (American Chemical Society, 2011-12)Photoinduced electron transfer in self-assemblies of porphyrins ion-paired with ssDNA wrapped around single-wall carbon nanotubes (SWCNTs) has been reported. To accomplish the three-component hybrids, two kinds of ... -
Bis-functionalized fullerene-dibenzo[18]crown-6 conjugate: synthesis and cation-complexation dependent redox behavior
Smith, Phillip M.; McCarty, Amy L.; Nguyen, Nhu Yen; Zandler, Melvin E.; D'Souza, Francis (Royal Society of Chemistry, 2003-07-21)A one-step synthesis of bis-pyrrolidine functionalized fullerene-dibenzo[18]crown-6 conjugate and its metal cation complexation to the crown ether entity dependent redox behavior is reported. -
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 ... -
Carbon nanostructured based donor-acceptor conjugates for light-induced energy and electron transfer
Maligaspe, Eranda (Wichita State University, 2010-12)The research presented in this dissertation deals with the syntheses, characterization, electrochemical, computational and photophysical studies of carbon nanostructures such fullerenes, single-wall carbon nanotubes (SWCNT) ... -
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 ... -
Comparison of amorphous iridium water-oxidation electrocatalysts prepared from soluble precursors
Blakemore, James D.; Schley, Nathan D.; Kushner-Lenhoff, Maxwell N.; Winter, Andrew M.; D'Souza, Francis; Crabtree, Robert H.; Brudvig, Gary W. (American Chemical Society, 2012-07-16)Electrodeposition of iridium oxide layers from soluble precursors provides a route to active thin-layer electrocatalysts for use on water-oxidizing anodes. Certain organometallic half-sandwich aqua complexes of iridium ... -
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 ... -
Design and physico-chemical studies of "two-point" bound supramolecular porphyrin-fullerene conjugates formed by cation-crown ether complexation and axial co-ordination or π-π interactions
Chitta, Raghu; Suresh, Gadde; Melvin E., Zandler; McCarty, Amy L.; Sandanayaka, Atula S. D.; Yasuyaki, Araki; Osamu, Ito; D'Souza, Francis (Wichita State University. Graduate School., 2006-04-28) -
Design and studies of a self-assembled cofacial zinc phthalocyanine dimer complexed with fullerene(s)
Maligaspe, Eranda; D'Souza, Francis (Wichita State University. Graduate School., 2008-04-25)Biomimetic bacterial photosynthetic reaction center complexes have been constructed using welldefined self-assembled supramolecular approaches. The “special pair” donor, a cofacial phthalocyanine dimer, was formed via ... -
Design and studies of azadipyrromethene appended donor-acceptor conjugates
Amin, Anu N. (Wichita State University, 2011-07)The research work presented in this thesis is comprised of syntheses, characterization, electrochemical and photophysical studies of aza-BODIPY appended donor-acceptor conjugates. The first chapter delivers an introduction ... -
Design and studies of photo-induced electron transfer in ‘Pacman’ type porphyrin-fullerene conjugates
Maligaspe, Eranda; D'Souza, Francis (Wichita State University. Graduate School., 2007-04-27)The design of donor-acceptor systems and the study of their photo-induced electron transfer processes are of current interest in artificial photosynthesis and solar energy conversion. Among donor-acceptor conjugates, ... -
Design and studies on supramolecular ferrocene-porphyrin-fullerene constructs for generating long-lived charge separated states
D'Souza, Francis; Chitta, Raghu; Gadde, Suresh; Islam, D-M Shafiqul; Schumacher, Amy Lea; Zandler, Melvin E.; Araki, Yasuyaki; Ito, Osamu (American Chemical Society, 2006-12-21)Supramolecular ferrocene-porphyrin-fullerene constructs, in which covalently linked ferrocene-porphyrin-crown ether compounds were self-assembled with alkylammonium cation functionalized fullerenes, have been designed to ... -
Design, syntheses, and studies of supramolecular porphyrin-fullerene conjugates, using bis-18-crown-6 appended porphyrins and pyridine or alkyl ammonium functionalized fullerenes
D'Souza, Francis; Chitta, Raghu; Gadde, Suresh; McCarty, Amy L.; Karr, Paul A.; Zandler, Melvin E.; Sandanayaka, Atula S. D.; Araki, Yasuyaki; Ito, Osamu (American Chemical Society, 2006-03-30)Photoinduced electron-transfer processes in cis and trans functionalized bis-18-crown-6 porphyrin self-assembled with fullerene functionalized with pyridine or alkylammonium cation entities are reported. The structural ... -
Dimethyl azo(bisisobutyrate) and C(60) produce 1,4- and 1, 16-Di(2-carbomethoxy-2-propyl)-1,x-dihydro
Ford, Warren T.; Nishioka, Takuya; Qiu, Feng; D'Souza, Francis; Choi, Jai-pil (American Chemical Society, 2000-09-08)Thermal decomposition of dimethyl azo(bisisobutyrate) in a solution containing C(60) produced 1,4- and 1, 16-di(2-carbomethoxy-2-propyl)-1,x-dihydro[60]fullerenes in yields of 21% and 27%, respectively, based on reacted ...