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Browsing CHEM Faculty Publications by Title

Browsing CHEM Faculty Publications by Title

Now showing items 160-179 of 253

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), ...
Near unity photon-to-electron conversion efficiency of photoelectrochemical cells built on cationic water-soluble porphyrins electrostatically decorated onto thin-film nanocrystalline SnO2 surface

Subbaiyan, Navaneetha K.; Maligaspe, Eranda; D'Souza, Francis (American Chemical Society, 2011-07-01)

Thin transparent SnO(2) films have been surface modified with cationic water-soluble porphyrins for photoelectrochemical investigations. Free-base and zinc(II) derivatives of three types of cationic water-soluble porphyrins, ...
Neutrophil elastase inhibitors

Groutas, William C.; Dou, Dengfeng; Alliston, Kevin R. (Informa Healthcare, 2011-03-01)

INTRODUCTION: Chronic obstructive pulmonary disease (COPD) constitutes a worldwide health problem. There is currently an urgent and unmet need for the development of small molecule therapeutics capable of blocking and/or ...
N,N,N',N'-tetramethyl-1,4-phenylenediamine: a facile electron donor and chromophoric substrate for dopamine beta-monooxygenase

Wimalasena, Kandatege; Wimalasena, D. Shyamali (Elsevier, 1991-03-29)

Dopamine beta-monooxygenase is shown to catalyze the oxidation of N,N,N',N'-tetramethyl-1,4-phenylenediamine (TMPD) to its cation radical in the presence of a regular substrate and molecular oxygen. The enzyme-mediated ...
Non-aqueous titration of hydroxamic acids

Stamey, T. W.; Christian, Robert (Elsevier, 1966-01-01)

Benzohydroxamic acid is titrated with 0.1M tetrabutyl-anunonium hydroxide in nine non-aqueous solvents with three different indicating electrodes. The best results are obtained using dimethylformamide as solvent and ...
Noncovalent inhibitors of human leukocyte elastase based on the 4-imidazolidinone scaffold

Wei, Liuqing; Gan, Xiangdong; Zhong, Jiaying; Alliston, Kevin R.; Groutas, William C. (Elsevier, 2003-11-17)

A central problem associated with the design of enzyme inhibitors in general, and serine protease inhibitors in particular, is the identification of templates capable of binding to the active site of an enzyme in a predictable ...
NOR and AND logic gates based on supramolecular porphyrin-fullerene conjugates

Maligaspe, Eranda; D'Souza, Francis (American Chemical Society, 2010-02-05)

Supramolecular porphyrin-fullerene conjugates are employed to build NOR and AND logic gates. A crown ether appended zinc porphyrin and an imidazole or an alkyl ammonium functionalized fullerene are utilized. Quenching of ...
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 ...
Novel fragmentation pathway for CID of (b(n) - 1 + Cat)+ ions from model, metal cationized peptides

Cooper, Travis J.; Talaty, Erach R.; Van Stipdonk, Michael J. (Springer, 2005-08-01)

We report a new fragmentation pathway for the CID of (b3 - 1 + Cat)+ product ions derived from the model peptide AXAG, where X = beta-alanine, gamma-aminobutyric acid, epsilon-amino-n-caproic acid, or 4-aminomethylbenzoic ...
Novel potential mechanism-based inhibitors of human leukocyte elastase and cathepsin G: derivatives of isothiazolidin-3-one

Groutas, William C.; Chong, Lee S.; Venkataraman, Radhika (Elsevier, 1993-12-15)

A series of heterocyclic compounds designed to function as mechanism-based inhibitors of human leukocyte elastase and cathepsin G has been synthesized and their inhibitory activity was investigated. These isothiazolidin-3-one ...
P(450)/NADPH/O(2)- and P(450)/PhIO-catalyzed N-dealkylations are mechanistically distinct

Bhakta, Mehul N.; Hollenberg, Paul F.; Wimalasena, Kandatege (American Chemical Society, 2005-02-09)

A high-valent iron-oxo species analogous to the compound I of peroxidases has been thought to be the activated oxygen species in P450-catalyzed reactions. Spectroscopic characterization of the catalytically competent ...
Palladin and regulation of actin crosslinking and dynamics

Beck, Moriah; Dixon, Richard; Goicoechea, Silvia; Murphy, Grant; Otey, Carol; Campbell, Sharon (Wiley-Blackwell, 2012-08)

Palladin is a recently discovered actin-associated protein that appears to be involved in both normal cell migration and invasive cell motility. Recently, we demonstrated that palladin is able to both bind and bundle actin ...
Perturbation of dopamine metabolism by 3-amino-2-(4'-halophenyl)propenes leads to increased oxidative stress and apoptotic SH-SY5Y cell death

Samms, Warren C.; Perera, Rohan P.; Wimalasena, D. Shyamali; Wimalasena, Kandatege (American Society for Pharmacology and Experimental Therapeutics, 2007-09-01)

We have recently characterized a series of 3-amino-2-phenyl-propene (APP) derivatives as reversible inhibitors for the bovine adrenal chromaffin granule vesicular monoamine transporter (VMAT) that have been previously ...
pH-induced alteration and oxidative destruction of heme in purified chromaffin granule cytochrome b(561): implications for the oxidative stress in catecholaminergic neurons

Wanduragala, Srimevan; Wimalasena, D. Shyamali; Haines, Donovan C.; Kahol, Pawan K.; Wimalasena, Kandatege (American Chemical Society, 2003-04-01)

The transmembrane hemoprotein, cytochrome b(561) (b(561)), in the neuroendocrine secretory vesicles is shown to shuttle electrons from the cytosolic ascorbate (Asc) to the intravesicular matrix to provide reducing equivalents ...
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) ...
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 ...
Photoinduced electron transfer in a Watson-Crick base-paired, 2-aminopurine:uracil-C60 hydrogen bonding conjugate

D'Souza, Francis; Gadde, Suresh; Islam, D-M Shafiqul; Pang, Siew-Cheng; Schumacher, Amy Lea; Zandler, Melvin E.; Horie, Rumiko; Araki, Yasuyaki; Ito, Osamu (Royal Society of Chemistry, 2007-02-07)

A fluorescent reporter molecule, 2-aminopurine was self-assembled via Watson-Crick base-pairing to a uracil appended fullerene to form a donor-acceptor conjugate; efficient photoinduced charge separation was confirmed by ...
Photophysical, spectroscopic, and computational studies of a series of Re(I) tricarbonyl complexes containing 2,6-dimethylphenylisocyanide and 5- and 6-derivatized phenanthroline ligands

Villegas, John M.; Stoyanov, Stanislav R.; Huang, Wei; Rillema, D. Paul (American Chemical Society, 2005-04-04)

The ligand 2,6-dimethylphenylisocyanide (CNx) forms six complexes of the formula [Re(CO)3(CNx)(L)]+, where L = 1,10-phenanthroline (1), 5-chloro-1,10-phenanthroline (2), 5-nitro-1,10-phenanthroline (3), 5-methyl-1,10-phe ...
Photosynthetic antenna-reaction center mimicry: sequential energy- and electron transfer in a self-assembled supramolecular triad composed of boron dipyrrin, zinc porphyrin and fullerene

Maligaspe, Eranda; Tkachenko, Nikolai V.; Subbaiyan, Navaneetha K.; Chitta, Raghu; Zandler, Melvin E.; Lemmetyinen, Helge; D'Souza, Francis (American Chemical Society, 2009-07-30)

A self-assembled supramolecular triad, a model to mimic the photochemical events of photosynthetic antenna-reaction center, viz., sequential energy and electron transfer, has been newly constructed and studied. Boron ...