Browsing Chemistry and Biochemistry by Author "Sandanayaka, Atula S. D."
Now showing items 1-14 of 14
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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 ... -
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, 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 ... -
Effect of axial ligation or pi-pi-type interactions on photochemical charge stabilization in "two-point" bound supramolecular porphyrin-fullerene conjugates
D'Souza, Francis; Chitta, Raghu; Gadde, Suresh; Zandler, Melvin E.; McCarty, Amy L.; Sandanayaka, Atula S. D.; Araki, Yasuyaki; Ito, Osamu (John Wiley and Sons, 2005-07-18)Two types of structurally well-defined, self-assembled zinc porphyrin-fullerene conjugates were formed by "two-point" binding strategies to probe the effect of axial ligation or pi-pi-type interactions on the photochemical ... -
Functionalization of diameter-sorted semiconductive SWCNTs with photosensitizing porphyrins: syntheses and photoinduced electron transfer
Das, Sushanta K.; Sandanayaka, Atula S. D.; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Ito, Osamu; Souza, Francis D. (WILEY-V C H VERLAG GMBH, BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY, 2012-09)Covalent functionalization of diameter sorted SWCNTs with porphyrins (MP), and photochemistry to establish nanotube diameter-dependent charge separation efficiencies are reported. The MP-SWCNT(n, m) [M = 2H or Zn, and (n, ... -
Photochemical charge separation in supramolecular phthalocyanine-multifullerene conjugates assembled by crown ether-alkyl ammonium cation interactions
D'Souza, Francis; Maligaspe, Eranda; Sandanayaka, Atula S. D.; Subbaiyan, Navaneetha K.; Karr, Paul A.; Hasobe, Taku; Ito, Osamu (American Chemical Society, 2010-10-21)Self-assembled phthalocyanine-multifullerene donor-acceptor conjugates have been formed by crown ether-ammonium cation dipole-ion binding strategy to probe the photochemical charge separation. To achieve this, phthalocyanine ... -
Photoinduced charge separation in three-layer supramolecular nanohybrids: fullerene-porphyrin-SWCNT
D'Souza, Francis; Das, Sushanta K.; Sandanayaka, Atula S. D.; Subbaiyan, Navaneetha K.; Gollapalli, Deviprasad R.; Zandler, Melvin E.; Wakahara, Takatsugu; Ito, Osamu (Royal Society of Chemistry, 2012-12-14)Photoinduced charge separation processes of three-layer supramolecular hybrids, fullerene-porphyrin-SWCNT, which are constructed from semiconducting (7,6)- and (6,5)-enriched SWCNTs and self-assembled via pi-pi interacting ... -
Photosynthetic reaction center mimicry of a "special pair" dimer linked to electron acceptors by a supramolecular approach: self-assembled cofacial zinc porphyrin dimer complexed with fullerene(s)
D'Souza, Francis; Chitta, Raghu; Gadde, Suresh; Rogers, Lisa M.; Karr, Paul A.; Zandler, Melvin E.; Sandanayaka, Atula S. D.; Araki, Yasuyaki; Ito, Osamu (John Wiley and Sons, 2007-01-01)Biomimetic bacterial photosynthetic reaction center complexes have been constructed using well-defined self-assembled supramolecular approaches. The "special pair" donor, a cofacial porphyrin dimer, was formed via potassium ... -
Potassium ion controlled switching of intra- to intermolecular electron transfer in crown ether appended free-base porphyrin-fullerene donor-acceptor systems
D'Souza, Francis; Chitta, Raghu; Gadde, Suresh; Zandler, Melvin E.; McCarty, Amy L.; Sandanayaka, Atula S. D.; Araki, Yasuyaki; Ito, Osamu (American Chemical Society, 2006-04-06)Photoinduced electron transfer in intramolecularly interacting free-base porphyrin bearing one or four 18-crown-6 ether units at different positions of the porphyrin macrocycle periphery and pristine fullerene was investigated ... -
Self-assembled single-walled carbon nanotube:zinc-porphyrin hybrids through ammonium ion-crown ether interaction: construction and electron transfer
D'Souza, Francis; Chitta, Raghu; Sandanayaka, Atula S. D.; Subbaiyan, Navaneetha K.; D'Souza, Lawrence; Araki, Yasuyaki; Ito, Osamu (John Wiley and Sons, 2007-01-01)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 ... -
Sensitive efficiency of photoinduced electron transfer to band gaps of semiconductive single-walled carbon nanotubes with supramolecularly attached zinc porphyrin bearing pyrene glues
Maligaspe, Eranda; Sandanayaka, Atula S. D.; Hasobe, Taku; Ito, Osamu; D'Souza, Francis (American Chemical Society, 2010-06-16)Photoinduced electron transfer in self-assembled single-walled carbon nanotube (SWNT)/zinc porphyrin (ZnP) hybrids utilizing (7,6)- and (6,5)-enriched SWNTs has been investigated. Toward this, first, zinc porphyrin was ... -
Supramolecular carbon nanotube-fullerene donor-acceptor hybrids for photoinduced electron transfer
D'Souza, Francis; Chitta, Raghu; Sandanayaka, Atula S. D.; Subbaiyan, Navaneetha K.; D'Souza, Lawrence; Araki, Yasuyaki; Ito, Osamu (American Chemical Society, 2007-12-26)Photoinduced electron transfer in a self-assembled single-wall carbon nanotube (SWNT)-fullerene(C60) hybrid with SWNT acting as an electron donor and fullerene as an electron acceptor has been successfully demonstrated. ... -
Supramolecular porphyrin-fullerene via 'two-point' binding strategy: axial-coordination and cation-crown ether complexation
D'Souza, Francis; Chitta, Raghu; Gadde, Suresh; Zandler, Melvin E.; Sandanayaka, Atula S. D.; Araki, Yasuyaki; Ito, Osamu (Royal Society of Chemistry, 2005-03-14)A highly stable porphyrin-fullerene conjugate with defined distance and orientation, was formed using a newly developed 'two-point' binding strategy involving axial-coordination and cation-crown ether complexation; ... -
Supramolecular triad and pentad composed of zinc-porphyrin(s), oxoporphyrinogen, and fullerene(s): design and electron-transfer studies
Schumacher, Amy Lea; Sandanayaka, Atula S. D.; Hill, Jonathan P.; Ariga, Katsuhiko; Karr, Paul A.; Araki, Yasuyaki; Ito, Osamu; D'Souza, Francis (John Wiley and Sons, 2007-01-01)By adopting a "covalent-coordinate" bonding approach, novel supramolecular pentad and triad molecules composed of zinc-porphyrin(s), fullerene(s), and oxoporphyrinogen redox-/photoactive entities have been constructed, and ...