四苯基钴卟啉化合物催化过亚硝酸根分解的研究  

Study on the Catalysis of Peroxynitrite Decomposition by Cobalt Tetraphenylporphyrin Compounds

作　　者：张伟[1] 罗云敬[1] 钟儒刚[1] 郑大威[1] 佘远斌[2] 

机构地区：[1]北京工业大学生命科学与生物工程学院,北京100022 [2]北京工业大学环境与能源工程学院,北京100022

出　　处：《化学学报》2007年第6期557-560,共4页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20605002);北京市科技新星计划(No.2003B05);北京市自然科学基金(No.2052004)资助项目.

摘　　要：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kcat分别为1.69×102,1.52×102,1.43×102和1.20×103mol-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.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 decompos!tion 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 kcat of TPPCoCl, T（p-CH3）PPCoCl, T（p-OCH3）PPCoCl and T（p-Cl）- PPCoCl are 1.69×10^2, 1.52×10^, 1.43×10^2 and 1.20×10^3 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.

关 键 词：钴卟啉 催化活性 过亚硝酸根 中间体 

分 类 号：O643.32[理学—物理化学]