Novel Conducting Polymers Electrosynthses And Spectralanalysis Study

Electrochemical polymerization had been proved to be one of the most useful approaches for conducting polymer synthesis. The electrochemical syntheses of conducting polymer were usually preformed in neutral organic solvents or in aqueous solution. In these media, however, the oxidation potentials of many aromatic monomers were so high that the qualities of as-formed polymers were usually very poor. On the other hand, the studies of CPs were mainly concentrated on the simple heterocyclic polymers in the past quarter century, such as polyaniline, polypyrrole, polythiophene, etc.. In recent years, high-quality conducting polymers prepared from fused ring aromatic compounds by electrochemical polymerization had attracted great attention. It is well known that boron trifluoride diethyl etherate (BFEE) solution is a middle strong Lewis acid. It is also a good electrolyte for the electrosyntheses of high quality conducting polymers from various aromatic monomers, such as thiophene, benzene and their derivatives. On the other hand, the research about some theoretical problems in conducting polymers was limited clue to the greatly insufficiency of spectrum data obtained presently on the conducting polymers. This dissertation focused on the electrosyntheses and spectral analysis of high-quality conducting polymers from strong electron-withdrawing group substituted indoles such as 5-nitroindole, 5-cyanoindole in BFEE and diethyl ether, dibenzofuran in mixed electrolytes of BFEE and trifluoroacetic acid (TFA) or concentrated sulfuric acid (SA), and poly(N-vinyl-carbazole) in tetrahydrofuran (THF) and BFEE. In addition, the electrochemical properties and spectral properties of poly (dibenzofuran-co-3-methylthiophene) electrodeposited under different condition were also investigated in pure BFEE.1. For the first time, high-quality strong electron-withdrawing group 5-substituted polyindole films with conductivity of 10^-2 S cm^-1 were synthesized electrochemically by direct oxidation of indole in BEEE and diethyl ether, such as poy(5-nitroindole) (PNP), poly(5-cyanoindole) (P5C1). The oxidation onset potential of 5-nitroindole, 5-cyanoindole in this medium was measured to be only 1.04, 1.15 V vs. SCE, respectively. Fluorescence spectra indicated that as-formed PNP, P5CI were good...