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macrocyclic compound as ionophores in lead(Ⅱ) ion-selective electrodes with excellent response characteristics

Chinese Science Bulletin 2008年第21期53卷 3255-3266页

作者： huang meirong ma xiaoli li xingui Key Laboratory of Advanced Civil Engineering materials of Ministry of Education Institute of Materials Chemistry College of Materials Science and Engineering Tongji University Shanghai 200092 China

macrocyclic compounds,such as crown ethers,azacrown ethers,thiacrown ethers,calixarenes and porphyrins,which act as ionophores in lead(Ⅱ) ion-selective electrodes,are systematically summarized based on the latest *** molecular structure characteristics of the ionophores are *** modification regulations for the substituted ionophores are elaborated with the purpose of improving the response features of the lead(Ⅱ) ion-selective electrodes assembled by *** is pointed out that the introduction of pendant moieties which contain soft base coordination centers like N,S and P atoms is in favor of adjusting the cavity size and conformation of the macrocyclic ***,there is synergic effect between the cavity and the donor sites of the ligand and thus the selective complexation of lead ions is easily realized,resulting in significant avoidance of the interference from other metal *** macrocyclic ionophore having the best response characteris-tics thus far was found to be N,N'-dimethylcyanodiaza-18-crown-6 with the detection limit of 7.0×10-8(14.5 μg/L),which is one of the uncommon ionophores that can really eliminate the interference from silver and mercury *** selectivity coefficients of the ionophore for lead ions over other metal ions,such as alkali,alkaline earth and transition metal ions are in the order of 10-4 or smaller,where the se-lectivity coefficient of lead(Ⅱ) over mercury(Ⅱ) ions is much lower,down to 8.9×*** structure de-sign idea for high-performance ionophore is proposed according to present *** incorporation of nitrogen atom,especially cyano group or thiocyano group or amino/imino groups,rather than thio atom alone could result in new excellent lead *** aborative design for metacyclophanes containing aromatic nitrogen atoms with the aim of creating excellent ionophores would also become a potential research *** lead(Ⅱ) ion-selective electrodes have shown widely potential ap

关键词：大环复合物离子载体电极电路

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