Jing Fang

Document Type

Thesis

Date of Award

12-2013

School/College

College of Science, Engineering, and Technology (COSET)

Degree Name

MS in Chemistry

First Advisor

Professor Xin Wei

Second Advisor

Professor Yuanjian Deng

Abstract

The present research focuses on the following two areas: (1) to prepare advanced nanocomposites through electropolymerization, and (2) to synthesize novel platinum complexes. (1) Substrate-Enhanced Electrodeposition of Polypyrrole on Carbon Nanotubes. Silver membrane filter (SMF) was utilized as a substrate, where carbon nanotubes (CNTs) were anchored and evenly distributed in its highly porous yet interconnected microstructure through vacuum filtration. Taking advantage of SMF's superb electrical conductivity, the CNTs-loaded SMF could be engaged as a working electrode, where pyrrole was electropolymerized on the surface of CNTs. Scanning electron micrograms demonstrated that polypyrrole (PPy) grew more evenly on the H202/HCl-pretreated single-walled CNTs (SWNTs) than on pristine SWNTs. Energy dispersive X-ray spectroscopy and elemental analysis both confirmed the PPy coating. 2 Raman spectroscopy indicated that the H202/HCl pretreatment led to an improved structural uniformity among SWNTs, which contributed to the even distribution of the PPy coating on the pretreated SWNTs. When the electropolymerization was conducted at higher electrical potentials, a mixture of PPy and silver oxide might be deposited altogether onto the surface of CNTs and the resulting nanocomposites exhibited surprisingly high thermal stabilities. (2) Synthesis and Characterization of Novel Platinum(II) Complexes Containing Diaminocyclohexane and Thiourea Derivative Ligands. Six novel platinum(II) complexes of the form [Pt(DACH)L2](N03)2, where DACH = trans-l,2- diaminocyclohexane, L = thiourea (TU) or its derivatives, including l-acetyl-2-thiourea, l-ethyl-2-thiourea, 2-imidazolidinethione, 1,3-dimethyl-2-thiourea, and 1,1,3,3- tetramethyl-2-thiourea, were synthesized and characterized by elemental analysis, IR spectrometry, and NMR (IH and 13C) spectroscopy. The general synthetic procedure involved the reaction of [Pt(DACH)(H20)2](N03)2, which was formed in situ by treating Pt(DACH)h with silver nitrate, and two equivalents of TU or its derivatives. All the complexes are ionic compounds with nitrate counter ions and thus water soluble. One complex, [Pt(DACH)(TU)2](N03)2·H20, was structurally determined by X-ray diffraction methods. This compound crystallized in the orthorhombic space group Pnma with centrosymmetry.

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