Abstract

A hydroxy-substituted tetraphenylporphyrin was oxidatively electropolymerized from its solutions in ethanol by cyclic voltammetry. The electropolymerization process is investigated using cyclic voltammetry, absorption spectroscopy, and electrochemical quartz crystal microbalance. The results of IR and electronic absorption spectroscopy studies show that, in deposition from ethanol, the polymerization occurs via the O−H group of the phenyl substituent, which results in the formation of C−O−C bonds. The mechanism of polyporphyrin formation is similar to polymerization of simple organic compounds. The deposited polyporphyrin film (thickness of 80 nm) has a smooth surface. Using the Mott−Schottky approach, it was establish that the films have hole conductivity (i.e., they are a p-type semiconductor). The flat band potential of the poly-5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin is 0.33 V. The film is further oxidized in a supporting electrolyte solution by applying positive potentials, with anions of the supporting electrolyte incorporating into the polyporphyrin.

中文翻译：

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基于5,10,15,20-四（4-羟苯基）卟啉的导电卟啉薄膜的电化学合成

摘要

通过循环伏安法将羟基取代的四苯基卟啉从其在乙醇中的溶液氧化电聚合。使用循环伏安法，吸收光谱法和电化学石英晶体微量天平研究了电聚合过程。红外和电子吸收光谱研究的结果表明，在乙醇沉积中，聚合反应是通过苯基取代基的O-H基团发生的，这导致形成C-OC键。多卟啉形成的机理类似于简单有机化合物的聚合。所沉积的多卟啉膜（厚度为80 nm）具有光滑的表面。使用Mott-Schottky方法，可以确定膜具有空穴电导率（即，它们是p型半导体）。聚5,10,15,20-四（4-羟苯基）卟啉的平带电势为0.33V。通过施加正电势，在支持电解质溶液中进一步氧化膜，并将支持电解质的阴离子掺入多卟啉。