ELECTROCHEMICAL RECOGNITION OF GROUP-1 AND GROUP-2 METAL-CATIONS BY REDOX-ACTIVE IONOPHORES

被引:35
作者
BEER, PD [1 ]
CHEN, Z [1 ]
DREW, MGB [1 ]
PILGRIM, AJ [1 ]
机构
[1] UNIV READING,DEPT CHEM,READING RG6 2AD,BERKS,ENGLAND
关键词
ELECTROCHEMISTRY; CRYSTAL STRUCTURES; FERROCENE COMPLEXES; CROWN ETHER COMPLEXES;
D O I
10.1016/0020-1693(94)04040-0
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
New ferrocene bis(aza-crown ethers) 6 and 7 have been synthesised in which a ferrocene redox centre bridges the two aza-crown ether moieties, linked via methylene covalent bonds. Coordination chemical investigations revealed both ligands to form complexes with sodium, potassium, magnesium and barium cations. Single crystal X-ray structures of 4 and the [6.2K(+)](PF6-)(2) complex have also been determined. Electrochemical investigations have demonstrated that the binding of Na+, K+, Mg2+ and Ba2+ guest cations by 6 and 7 results in shifts of the respective ferrocene-ferrocenium redox couple to more positive potentials. The magnitude of these one-wave anodic shifts is related to the charge:radius ratio of the cationic guest species. Electrochemical recognition competition experiments suggest 6 exhibits a degree of selectivity for the Ba2+ cation.
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页码:137 / 144
页数:8
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