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Hydroquinone and other biological molecules in the liquid / liquid interface on Electron Transfer Processes

Author: DongDeFang
Tutor: LuXiaoQuan
School: Northwest Normal University
Course: Analytical Chemistry
Keywords: Liquid / liquid interface Thin layer cyclic voltammetry Scanning Electrochemical Microscopy Electron transfer
CLC: O621.2
Type: Master's thesis
Year: 2010
Downloads: 42
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Abstract


Liquid / liquid interface (Liquid / Liquid interface, L / L) is considered the most simple simulation model of biofilm. In the past few decades, this non-miscible interface to get the majority of the general concern of researchers. Charge (electrons and ions) metastasis is the most basic life activities of physical and chemical processes. It is important with many chemical and biological systems, such as chemical sensors, drug release in pharmacology, phase transfer catalysis, and is closely related to simulated biofilm research. Therefore, the study liquid / liquid interface on the electron transfer process to establish a sound and reasonable interface kinetic theory for understanding, understanding and mastering the many important physiological processes, revealing vivo metabolism of matter and energy to explore the generation of free radicals in vivo eliminate its pathogenesis is important. This paper combines the thin-layer cyclic voltammetry (Thin-Layer Cyclic Voltammetry, TLCV) and scanning electrochemical microscopy (Scanning Electrochemical Microscope, SECM) technology explores the electrons in the liquid / liquid interface on the transfer process. Text is divided into four parts, including the following elements: 1. Summary review of liquid / liquid interfaces development history, introduced the liquid / liquid interface of the basic principles of electrochemistry and development prospects, detailing TLCV and SECM two kinds method works and at the liquid / liquid interface electrochemistry research applications, development and quantitative analysis theory. 2 with SECM technology, application studied TLCV hydroquinone (QH2, aqueous phase) - decamethylnickelocene iron (DMFc, the organic phase) system in nitrobenzene (NB) / water (W) of the electron transfer interface process. Two methods of experimental results, which not only confirms the TLCV Methods liquid / liquid interface heterogeneous electron transfer reactions reliability, and also expand the scope of the study TLCV. 3 Application SECM comparative study of the following two systems of nitrobenzene (NB) / water (W) on the interface electron transfer processes: (1) hydroquinone (QH2, water phase) - ferrocene (Fc, the organic phase ) system; (2) hydroquinone (QH2, aqueous phase) - decamethylnickelocene iron (DMFc, the organic phase) system. And calculate the heterogeneous electron transfer rate constant. The results showed that: the interfacial reaction driving force affecting electron transfer rate is the size of the main factors. In addition, we ClO4-ions as co-ion, ion-pair study of common liquid / liquid interface potential difference control process. 4 Application SECM study the stability of zinc porphyrin cation effects on electron transfer. Experimental results show that: zinc porphyrin is a price that affect the stability of the electron transfer interface, one important factor. DFT calculations confirm the effect of the type of the substituent position is a price of zinc porphyrin thermodynamic energy molecular orbital energy, so that the stability will be changed. In addition, the co-ions of the electron transfer rate constant that a change in the ionic composition of the environment can be effectively controlled electron transfer processes in biological systems.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds
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