四苯基钴卟啉化合物催化过亚硝酸根分解的研究

利用紫外-可见分光光度计在乙醇介质中研究了合成的4种对位取代四苯基钴卟啉对过亚硝酸根分解的催化作用. 首次发现钴卟啉可以催化ONOO^－分解, 且对位带吸电子基团的钴卟啉比对位带供电子基团的钴卟啉催化活性高. TPPCoCl, T(p-CH₃)PPCoCl, T(p-OCH₃)PPCoCl和T(p-Cl)PPCoCl在乙醇中的k_cat分别为1.69×10², 1.52×10², 1.43×10²和1.20×10³ mol^－1?L?s^－1. 动力学曲线和时间分辨谱证明这些钴卟啉是通过形成中间体催化过亚硝酸根分解的.

Study on the Catalysis of Peroxynitrite Decomposition by Cobalt Tetraphenylporphyrin Compounds

Four cobalt tetraphenylporphyrins which are substituted in the para-position of a phenyl ring were synthesized, and their abilities to accelerate peroxynitrite decomposition were studied in ethanol by UV-Vis spectrophotometer. The catalysis of peroxynitrite decomposition by cobalt porphyrins was firstly found, and the catalytic activities of cobalt porphyrins with electron-withdrawing groups located in the para-position of a phenyl ring were higher than those with electron-donating groups located in the para-position of a phenyl ring. The k_cat of TPPCoCl, T(p-CH₃)PPCoCl, T(p-OCH₃)PPCoCl and T(p-Cl)- PPCoCl are 1.69×10², 1.52×10², 1.43×10² and 1.20×10³ mol^－1?L?s^－1 respectively. T(p-R)PPCoCl catalyzed peroxynitrite decomposition through the formation of intermediates from the observation of kinetic traces and time-resolved UV-Vis spectrum.