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Studies on the Electron Transfer of Metal Porphyrin and Other Compounds at Interface

Author: MaJunYing
Tutor: LuXiaoQuan
School: Northwest Normal University
Course: Analytical Chemistry
Keywords: Liquid / liquid interface Scanning Electrochemical Microscopy Electron transfer Chemically modified electrode
CLC: O621.1
Type: Master's thesis
Year: 2010
Downloads: 93
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Abstract


Electron transfer (Electron Transfer, ET) is the basic process of life activities, the majority of organisms life activities such as oxygen-carrying hemoglobin process of photosynthesis in chloroplasts, mitochondria respiration and electron transfer processes are all closely related, and most life processes are occurring on the biofilm. Therefore, the study of electron transfer for biofilm recognize, understand and master many important physiological processes, revealing vivo metabolic processes of matter and energy has an important significance. The liquid / liquid interface (Liquid / Liquid interface, L / L interface) is considered the most simple simulation biofilm model. In addition, the development of modified electrodes for some direct electrochemical behavior of biomolecules study provided the conditions. Based on this, mainly in a class of organisms closely related to the life activity of biomolecules - porphyrins and their metal complexes as the research object, a more systematic study of biofilms in the analog interface (liquid / liquid and solid / liquid) The electron transfer process and the direct electrochemical behavior. This is for the development of new biosensors also has a certain significance. With the rapid development of science and technology and the interpenetration between disciplines, the interface chemistry research will encounter more and more challenges and opportunities, and more sophisticated technology and a more rational application of the method, bound to human understanding of the natural develop a broader outlook. In this paper, Bard, who in the late 1980s proposed and developed a scanning electrochemical microscopy (Scanning Electrochemical Microscope, SECM) techniques and electrochemical impedance spectroscopy (EIS) was studied in a biomimetic metalloporphyrin electron transfer process on the interface. This paper is divided into four parts, including the following elements: 1. Recalled the liquid / liquid interface electrochemistry development background, the basic configuration and application prospects. Details the two main methods: SECM and thin layer cyclic voltammetry (TLCV) the working principle of the theory and application of quantitative analysis. And an overview of the development of modified electrodes, preparation methods and biological sensors and electro-catalytic aspects of the application, as well as the nature of ionic liquids and carbon nanotubes modified electrode and its application in. 2 explores the liquid / liquid interface driving force and the interfacial electron transfer reactions relationship between the use of SECM study compared with the aqueous phase nitrobenzene DMFc HSR electron transfer between ions. Experimental results show that when changing the water phase high iron ions surrounding environment, such as using Fe3 replace Fe (CN) 63 - and found that although the liquid-liquid interface greatly increases the driving force, but the electron transfer rate constant but decreases its causes are also discussed. Also, study co-ions on the rate constant. 3 Use the SECM studied tetraphenyl zinc porphyrin isomers in their simulated biofilms on electron transfer process, while the use of density functional theory (DFT) calculations of molecular structure, thermodynamic energy, molecular orbital angle were compared for the two discussed the structure of matter on its interface reaction. On the other hand, the use of different substituents to alter the structural stability of iron porphyrin, thus affecting the electron transfer rate constant, the main effect of different substituents on the iron porphyrin electron transfer kinetics and biological activity. 4 hemoglobin (hematin) is an important iron-porphyrin compounds. Using the ionic liquid (IL) and multi-walled carbon nanotubes (MWCNTs) of excellent properties, the hematin polyvinyl alcohol (PVA) fixed on MWCNTs modified ionic liquid modified carbon paste electrode (CILE) surface, carried out in the modified electrode hematin The direct electrochemical behavior. Experimental results show that the modified electrode hematin electron transfer was markedly increased, showing a quasi-reversible redox peaks, and calculate the relevant parameters. Meanwhile, to further explore the modified electrode electrically nitrite catalysis. The study of the development of the third generation of the sensor has a certain significance.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Theory of organic chemistry,physical organic chemistry
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