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Theses/Dissertations

Electronic Theses and Dissertations

2003

Chemistry

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Surface-Enhanced Vibrational Spectroscopy Of Diphenyl Sulfide And Diphenyl Disulfide On Films And Colloids, And The Single-Molecule Detection Of Perylene Dye On Silver And Gold Colloids., Ben Issa M. Ali. Tolaieb Jan 2003

Surface-Enhanced Vibrational Spectroscopy Of Diphenyl Sulfide And Diphenyl Disulfide On Films And Colloids, And The Single-Molecule Detection Of Perylene Dye On Silver And Gold Colloids., Ben Issa M. Ali. Tolaieb

Electronic Theses and Dissertations

In this work, colloidal particles of gold and silver are used as enhancing substrates to study behavior of organic sulfides and a perylene derivative butylimido, butyleneamine perylene (nBu-PTCDA-(CH2) 4-NH2) adsorbed on metal particles using surface-enhanced resonance Raman scattering (SERRS) or SERS. In addition, the SERS spectra of the adsorbed species formed by diphenyl disulfide and diphenyl sulfide (DPDS, DPS) on evaporated silver and gold island thin films were obtained. The SERS vibrational spectra of both DPDS and DPS are discussed and the vibrational assignments of the fundamental modes were aided with an ab-initio calculations using Density Functional Theory (DFT ...


Electrochemistry And Spectroscopy Of Energy Conversion And Polynuclear Aromatic Materials., Maryam. Nazri Jan 2003

Electrochemistry And Spectroscopy Of Energy Conversion And Polynuclear Aromatic Materials., Maryam. Nazri

Electronic Theses and Dissertations

The field of materials chemistry is becoming increasingly important in many technological disciplines, including batteries, fuel cells, hydrogen storage materials, and application of poly-nuclear aromatic compounds in solar cells, color copiers, sensors, and catalysis. This multidisciplinary research work focuses on the development, understanding, and characterization of novel materials for advanced lithium batteries and a unique series of polyaromatic compounds for application in solar cells and color copiers. A general overview of materials and techniques used in this work is presented, including the electrochemistry, spectroscopy, thermal analysis, and x-ray diffraction. A unique electrochemical procedure based on carbon paste microelectrode was applied ...


Down Regulation Of Gene Expression In Toxoplasma Gondii By Engineered Delta Ribozymes., Ju. Sheng Jan 2003

Down Regulation Of Gene Expression In Toxoplasma Gondii By Engineered Delta Ribozymes., Ju. Sheng

Electronic Theses and Dissertations

Delta ribozyme is a RNA enzyme derived from the genome of hepatitis delta virus (HDV). It can specifically cleave a RNA substrate and is the only ribozyme that can function naturally in human cells. These properties make the delta ribozyme attractive as a gene modulator. Toxoplasma gondii, a pathogenic parasite to humans and pets, has been used for genetic studies. Genes encoding uracil phosphoribosyltransferase (UPRT) and hypoxanthine-xanthine-guanine phosphoribosyltransferase (HXGPRT), which are the operative enzymes of the pyrimidine and purine salvage pathway, respectively, in T. gondii , were chosen for the study of the down regulation effect of delta ribozymes. Different delta ...


Chemical, Biochemical, And Cellular Aspects Of S-Nitrosothiols., Shirin. Akhter Jan 2003

Chemical, Biochemical, And Cellular Aspects Of S-Nitrosothiols., Shirin. Akhter

Electronic Theses and Dissertations

Nitric oxide is involved in many physiological processes including vascular control, immune responses and neurotransmission under physiological conditions. Many functions of NO are triggered by the formation of its metabolite, S-nitrosothiol. S-nitrosothiols play an important role in the delivery, storage and transport of NO. In addition, they regulate the activity of a variety of proteins and enzymes. The first part of my study is focused on studying the regulatory role of S-nitrosothiol. In this study, S-nitrosothiols including S-nitrosoglutathione (GSNO) have been demonstrated to regulate the activity of a key protein in plasma, fibrinogen, without chemically modifying it. GSNO and a ...


Group 8-10 Complexes Of Pyridyl-Phosphinimines And Chiral Bis-Diiminophosphoranes., Ramadan. Altwer Jan 2003

Group 8-10 Complexes Of Pyridyl-Phosphinimines And Chiral Bis-Diiminophosphoranes., Ramadan. Altwer

Electronic Theses and Dissertations

A group of exocyclic pyridyl-phosphinimine ligands have been prepared in excellent yields by oxidizing trip henylphosphine with 2-azidomethylpyridines. These ligands reacted with group 8--10 transition metals to form various late transition metal complexes (e.g. [Ph3P=NCH2(2-Py)]NiBr 2 36) which have been characterized and evaluated for olefin polymerization activity. We found that these complexes are not active for ethylene polymerization or oligomerization. In a similar sense, nickel complexes 55 and 56 were synthesized by the reaction of nickel dihalide with a chiral bis-diiminophosphorane ligands. The corresponding ligand was prepared by deprotonation of R-2,2' -diamino-1,1'-binaphthalenetriphenyldibromide by ...


Metallated Group Ix And Group X Phosphinimine Complexes., Katie Tak-Kwan. Chan Jan 2003

Metallated Group Ix And Group X Phosphinimine Complexes., Katie Tak-Kwan. Chan

Electronic Theses and Dissertations

The focus of this research has been the preparation of late transition metal phosphinimine complexes. The thesis herein describes the synthesis of a series of monomeric Group IX phosphinimine complexes. [RhCOD(o-C 6H4PPh2NR)] (R = 2,6-C6H3(CH 3)2 44, 2,6-C6H3 iPr2 45, 3,5-C6H3(CH 3)2 46 and Ph 47) were prepared via salt metathesis under mild conditions. The analogous complexes [Rh( o-C6H4PPh2NPh)(Ph2PCH 2CH2PPh2)] 52 and [IrCOD( o-C6H4PPh2NPh)] 53 were also readily prepared by similar methods. Reactivity studies were performed on these complexes. Unexpectedly, complexes 46, 47, 52 and 53 underwent oxidative addition of methylene chloride ...