Current Rectification with substituted aromatic amine diazonium modified electrodes and photodebromination with photosensitive cobalt complex

• Main Authors: LIN YUN-CHIOU, 林芸丘
• Other Authors: Chong Mou Wang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/05606259548208892784

碩士 === 國立臺灣師範大學 === 化學系 === 94 === Aromatic amines can be converted to diazonium salts, and can thus be cathodically deposited on carbon electrodes. In the light of this, we prepared chemically modified electrodes (CME) with aromatic amines, such as aniline and p-terphenylamine, via the diazonium pathway, and utilized them to rectify the flow of electric current from electrodes to electrolyte solutions. Experimental results based on cyclic voltammetry (CV), electrochemical quartz-crystal-microbalance analysis (EQCM), electrochemical impedance analysis (EIS), and totally-attenuated- reflectance Infrared absorption spectral (ATR-IR) analysis indicated that the CMEs prepared in this manner seem to be free of pin holes on the electrode surface, and can, in advance, be employed to microsolvate electron mediators, like benzoquinone (BQ), vitamin K3 (VK3) and anthraquinone (AQ), for further applications, such as for current rectification. Besides, we also attempted to mimic vitamin B12 for the dehalogenation of dibromobutane. Cobalt complexes such as tris(5-aminophenanthroline) cobalt(II) hexafluorophosphate (Co(NH2-phen)32+) show application potential in this aspect. By attaching light-absorption chromophores, like pyrene, with Co(NH2-phen)32+, we, in addition, found that the resultant derivative (denoted py-Co(NH2-phen)32+ ) can be reduced at less negative potential, ca. -0.6 V vs. Ag/AgCl under UV irradiation in DMSO, and then, cause dibromobutane (DBB) to be reductively decomposed into less toxic products.