Spectral Properties, Electrochemistry, Spectroelectrochemistry and Electropolymerized Films of Zinc Porphyrins Bound with Triphenylamine Units

• Main Authors: Huang Chih Wei, 黃智偉
• Other Authors: Cheng Shu Hua
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/63504341782744977453

碩士 === 國立暨南國際大學 === 應用化學系 === 93 === In this study, the spectral properties, electrochemistry, spectroelectrochemistry and electropolymerized films of porphyrin free bases and their zinc porphyrins bound with triphenylamine units are investigated. Absorption spectral study indicates that the molar extinction coefficients of H2TDPAPP (meso-tetra-p- (di-p-phenylamino)phenylporpyrin) and H2TDTAPP (meso- tetra-p-(di-p-tolylamino)phenylporphyrin) are lower than these of H2TPP (meso-tetraphenylporphyrin). The bandwidths of B band are broader and the oscillator strengths of Q band become stronger. Emission spectral study suggests intramolecular singlet engery transfer from TPA units to the porphyrin core and the fluorescence quantum yields are calculated. Electrochemical study indicates that the strong electron-donating properties of TPA groups affect the porphyrin rings, which are easier to be oxidized and harder to be reduced. Spectroelectrochemical study indicates that the cation radicals exhibit an absorption spectrum located in the NIR region suggesting intramolecular electron transfer has occurred. H2TDPAPP and ZnTDPAPP can be electropolymerized by oxidative scans on GCE or Pt. The properties of the modified electrodes are examined in pH 7.4 phosphate buffer containing various analytes. The ion selectivity of the electropolymerized films are discussed.