钴(Ⅱ,Ⅲ)与meso-四(4-苯基磺基)卟啉(TPPS)络合物的伏安行为研究  

Studies of Voltammetric Behaviour on Cobalt( Ⅱ , Ⅲ ) Complexes of meso-Tetra(p-sulfonatophenyl)porphyrin in Aqueous Solution

作　　者：侯建敏[1] 高小霞[1] 

机构地区：[1]北京大学化学系,北京100871

出　　处：《高等学校化学学报》1993年第9期1222-1226,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：木文报道了钴(Ⅱ,Ⅲ)与meso-四(4-苯基磺基)卟啉(TPPS)络合物的形成条件和电还原行为.结果表明在醋酸缓冲溶液(pH3.5)中,Co^(2+)-TPPS还原同时产生催化氢波.在氨性缓冲溶液(pH9.0)中,Co^(2+)-TPPS产生络合吸附波,讨论了其伏安行为,认为络合物中Co^(2+)和TPPS是一步同时还原.溶解氧可以把Co^(2+)-TPPS氧化为Co^(3+)-TPPS,对比Mn^(3+)-TPPS讨论了络合物的形成和溶解氧的作用,认为氧对卟啉络合物中心离子价态变化和电子转移起着重要作用.The formation and electrochemical behavior of cobalt (Ⅱ,Ⅲ) complexes of meso-te-tra(p-sulfonatophenyl)porphyrin(TPPS) in aqueous solution have been investigated. It has been shown that Co( Ⅱ )-TPPS may produce a polarographic catalytic hydrogen wave in HAc-NaAc buffer, pH 3. 5. In ammoniacal buffer solution (pH 9. 0) a absorptive complex wave of Co( Ⅱ )-TPPS was observed, which is attributed to the reduction of both Co( Ⅱ ) and TPPS π-ring in the complex. The formation of Co( Ⅲ )-TPPS complex and the effect of dissolved oxygen in solution comparing with that of Mn ( Ⅲ )-TPPS complex were discussed. It is considered that oxygen plays an important role in the valence of central metal atom and the rate of electron transfer in metalloporphyrins. The reductive wave of Co( Ⅱ )-TPPS in ammoniacal buffer solution (pH 10. 7) can be used to determine trace cobalt in the range of 2. 0×10-7 mol/L to 6. 0×10-6mol/ L with a detection limit of 1. 0×10-7 mol/L.

关 键 词：钴卟啉 锰卟啉 伏安法 络合物 

分 类 号：O614.812[理学—无机化学]