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Browsing CHEM Faculty Publications by Title

Browsing CHEM Faculty Publications by Title

Now showing items 228-247 of 253

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 solar cells: surface modification of nanocrytalline TiO(2) with coordinating ligands to immobilize sensitizers and dyads via metal-ligand coordination for enhanced photocurrent generation

Subbaiyan, Navaneetha K.; Wijesinghe, Channa A.; D'Souza, Francis (American Chemical Society, 2009-10-21)

An elegant method of self-assembly for modification of a TiO(2) surface using coordinating ligands followed by immobilization of variety of sensitizers and a dyad is reported. This highly versatile method, in addition to ...
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 ...
Syntheses and excitation transfer studies of near-orthogonal freebase porphyrin-ruthenium phthalocyanine dyads and pentad

Jacobs, Rachel; Stranius, Kati; Maligaspe, Eranda; Lemmetyinen, Helge; Tkachenko, Nikolai V.; Zandler, Melvin E.; D'Souza, Francis (American Chemical Society, 2012-03-19)

A new series of molecular dyads and pentad featuring free-base porphyrin and ruthenium phthalocyanine have been synthesized and characterized. The synthetic strategy involved reacting free-base porphyrin functionalized ...
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 ...
Synthesis and characterization of picket porphyrin receptors that bind phosphatidylglycerol, an anionic phospholipid found in bacterial membranes

Alliband, Amanda; Meece, Frederick A.; Jayasinghe, Champika; Burns, Dennis H. (American Chemical Society, 2013-01-18)

The lipid binding ability of four urea-picket porphyrins designed to bind to both the phosphate anion portion as well as the glycerol hydroxyl groups of phosphatidylglycerol (PG) has been investigated. Isothermal titration ...
Synthesis and photochemistry of Ru(II) complexes containing phenanthroline-based ligands with fused pyrrole rings

Villegas, John M.; Stoyanov, Stanislav R.; Rillema, D. Paul (American Chemical Society, 2002-12-16)

Hydrolysis of 1,10-phenanthrolinopyrrole ethyl ester leads to the acid derivative which is unstable at room-temperature releasing CO(2) and forming 1,10-phenanthrolinopyrrole (php). The ligand reacts with ruthenium(II) to ...
Synthesis, characterization, and photochemical and computational investigations of Ru(II) heterocyclic complexes containing 2,6-dimethylphenylisocyanide (CNx) ligand

Villegas, John M.; Stoyanov, Stanislav R.; Huang, Wei; Lockyear, Loranelle L.; Reibenspies, Joseph H.; Rillema, D. Paul (American Chemical Society, 2004-10-04)

The isocyanide ligand forms complexes with ruthenium(II) bis-bipyridine of the type [Ru(bpy)(2)(CNx)Cl](CF(3)SO(3)) (1), [Ru(bpy)(2)(CNx)(py)](PF(6))(2) (2), and [Ru(bpy)(2)(CNx)(2)](PF(6))(2) (3) (bpy = 2,2'-bipyridine, ...
Synthesis, characterization, photophysical, and computational studies of rhenium(I) tricarbonyl complexes containing the derivatives of bipyrazine

Kirgan, Robert A.; Simpson, Megan; Moore, Curtis E.; Day, Jeff; Bui, Loan; Tanner, Clayton; Rillema, D. Paul (American Chemical Society, 2007-08-06)

The chloro and pyridinate derivatives of rhenium(I) tricarbonyl complexes containing the diimine ligands 2,2'-bipyrazine (bpz) and 5,5'-dimethyl-2,2'-bipyrazine (Me2bpz) are reported. Absorption maxima occur in the visible ...
Synthesis, modification, and characterization of a family of homologues of exo-calix

Burns, Dennis H.; Chan, Ho-Kit; Miller, Jeffrey D.; Jayne, Charles L.; Eichhorn, David M. (American Chemical Society, 2000-08-25)

A general strategy for the preparation of the family of exo-[n.m.n.m]metacyclophanes (n,m > or = 3) in 6-steps (starting from 2-bromoanisole) that utilizes a [2 + 2] approach to furnish the exo-metacyclophane ring in good ...
Synthesis of urea picket porphyrins and their use in the elucidation of the role buried solvent plays in the selectivity and stoichiometry of anion binding receptors

Calderon-Kawasaki, Kenichi E.; Kularatne, Sumith; Li, Yue He; Noll, Bruce C.; Scheidt, W. Robert; Burns, Dennis H. (American Chemical Society, 2007-11-23)

The synthesis of alpha,alpha-5,10-diurea and alpha,alpha,alpha-5,10,15-triurea picket porphyrins are detailed in this report. In previous reports, these porphyrins, along with alpha,alpha,alpha,alpha-5,10,15,20-tetraurea ...
Synthetic strategies for the preparation of precursor polymers and of microcapsules suitable for cellular entrapment by polyelectrolyte complexation of those polymers

Dyakonov, Tania A.; Zhou, Lei; Wan, Zeng; Huang, Bin; Meng, Zhizhong; Guo, Xiaoyan; Alexander, Holly; Moore, Wayne V.; Stevenson, William T.K. (John Wiley and Sons, 1997-12-31)

The production of microcapsules suitable for the entrapment of mammalian cell by means of polyelectrolyte complexation has, of a necessity, led to the development of novel strategies for the preparation of relatively ...
Thallium(I) complexes of cyano-substituted bispyrazolylborate ligands

Johnson, Donald M.; Eichhorn, David M.; Moore, Curtis E.; Mwania, Tom M.; Zhao, Ningfeng (Springer, 2012-07)

Two thallium scorpionate complexes: dihydrobis(3-phenyl-4-cyanopyrazolyl)boratothallium(I) (TlBp(Ph,4CN)), C20H14BN6Tl and dihydrobis(3-tert-butyl-4-cyanopyrazolyl)boratothallium(I) (TlBp (t-Bu,4CN)), C16H22BN6Tl have been ...
Through-bond photoinduced electron transfer in a porphyrin-fullerene conjugate held by a Hamilton type hydrogen bonding motif

D'Souza, Francis; Venukadasula, Ganesh M.; Yamanaka, Ken-ichi; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Ito, Osamu (The Royal Society of Chemistry, 2009-03-21)

Control over the occurrence of through-bond electron transfer in self-assembled donor-acceptor conjugates is often difficult, since through-space electron transfer also competes due to the flexible nature of the spacer ...
Time-dependent density functional theory study of the spectroscopic properties related to aggregation in the platinum(II) biphenyl dicarbonyl complex

Stoyanov, Stanislav R.; Villegas, John M.; Rillema, D. Paul (American Chemical Society, 2003-12-01)

Singlet ground-state geometry optimization of the monomer, four dimers, and the trimer of [Pt(bph)(CO)(2)], where bph = biphenyl dianion, was performed at the B3LYP level of density functional theory (DFT) with a mixed ...
Tridentate N(2)S ligand from 2,2'-dithiodibenzaldehyde and N,N-dimethylethylenediamine: synthesis, structure, and characterization of a Ni(II) complex with relevance to Ni Superoxide Dismutase

Zimmerman, Joshua R.; Smucker, Bradley W.; Dain, Ryan P.; Van Stipdonk, Michael J.; Eichhorn, David M. (Elsevier, 2011-07-15)

Nickel Superoxide Dismutase (NiSOD) and the A-cluster of Carbon Monoxide Dehydrogenase/Acetyl Coenzyme A Synthase (CODH/ACS) both feature active sites with Ni coordinated by thiolate and amide donors. It is likely that the ...
Two-component polymer films of palladium and fullerene with covalently linked crown ether voids: effect of cation binding on the redox behavior

Wysocka-Zolopa, Monika; Winkler, Krzysztof; Gadde, Suresh; D'Souza, Francis (Springer, 2012-01)

Redox active films have been generated via electrochemical reduction in a solution containing palladium(II) acetate and fulleropyrrolidine with covalently linked crown ethers, viz., benzo-15-crown-5 and benzo-18-crown-6. ...
Two similar dibenzo cyclic ethers with dissimilar conformations

Burns, Dennis H.; Meece, Frederick A.; Moore, Curtis E.; Eichhorn, David M. (Wiley-Blackwell, 2009-01-01)

Two dibenzo cyclic ether compounds, 6,12-dibromodibenzo[d,i]-1,2,3,6,7,8-hexahydro-1,3-dioxecin (systematic name: 8,16-dibromo-2,4-dioxatricyclo[12.4.0.0(5,10)]octadeca-5,7,9,14,16,18-hexaene), C(16)H(14)Br(2)O(2), (II), ...
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 ...
Ultrafast singlet-singlet energy transfer in self-assembled via metal-ligand axial coordination of free-base porphyrin-zinc phthalocyanine and free-base porphyrin-zinc naphthalocyanine dyads

Maligaspe, Eranda; Kumpulainen, Tatu; Lemmetyinen, Helge; Tkachenko, Nikolai V.; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; D'Souza, Francis (American Chemical Society, 2010-01-14)

Singlet-singlet energy transfer in self-assembled via axial coordination of imidazole-appended (at different positions of one of the meso-phenyl entities) free-base tetraphenylporphyrin, H(2)PIm, to either zinc phthalocyanine, ...