摘要
本文报道在氨性溶液中(pH=8.8)TPPS和Zn^(2+)-TPPS,Mn^(2+)-TPPS络合物的形成及伏安行为;在Cd^(2+)和咪唑存在时,室温下可以较快形成相应的络合物,用伏安法和光度法研究了它们的催化作用;比较了Zn^(2+)-TPPS和Mn^(2+)-TPPS的氧化还原性质以及氧的影响。
In ammonical buffer solution at pH 8.8, the formation and electrochemical properties of Zn(Ⅱ), Mn(Ⅱ)-TPPS complexes were investigated. The Mn(Ⅱ)-TPPS complex may be formed at room temperature in the presence of Cd(Ⅱ) and imidazole within ten minutes, and it may be oxidized to Mn(Ⅲ)-TPPS by oxygen dissolved in the solution. In order to elucidate the catalytic functions of Cd(Ⅱ) and imidazole, we have carried experiments using voltammetry and absorption spectroscopy. The results show that Cd(Ⅱ) is more easily coordinated with three nitrogen atoms in the porphyrin ring and the complex thus formed is easily substituted by Mn(Ⅱ) and Zn(Ⅱ) to form Mn(Ⅱ)-TPPS and Zn(Ⅱ)-TPPS complexes respectively. The role of imidazole is to form an axial bond with Cd-TPPS, thus stabilizing the Cd-TPPS complex.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1992年第2期189-196,共8页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
关键词
锌-卟啉
锰-卟啉
络合物
伏安法
Zn, Mn-TPPS complexes
Voltammetry
Absorption spectroscopy
Catalytic functions of Cd(Ⅱ) and imidazole
