(7-甲氧基-4-亚甲基)香豆素基-单氮杂-18-冠-6的阳离子识别性能研究

基于题示光敏离子载体MMC-MAC(O₅)与金属离子配位时荧光或延迟荧光性质的变化,研究了它作为光敏主体在乙腈或水溶液中对Li⁺,Na⁺,K⁺,Mg²⁺,Ba²⁺和Pb²⁺离子的识别性能,由改进的H-B方程计算得主客识别的稳定常数和敏感因子.结果表明,由于该光敏离子载体的香豆素的羰基能以七元环形式参与对金属离子的配位,在一定程度上增大了对客体离子的络合能力;在水溶液中,由于金属离子的溶剂化作用和因香豆素的羰基易与水形成氢键,影响了MMC-MAC(O₅)与客体离子的结合,稳定常数明显降低.基于MMC-MAC(O₅)的分子结构和与金属离子结合时荧光强度的增强,讨论了识别机理

Studies on Cation Recognition Properties of 7-Methoxy-4-methene-coumarin-monoaza-18-crown-6

The cation recognition properties of the title luminescent ionophore MMC MAC(O 5) in acetonitrile and aqueous solution by the normal fluorescence or delayed fluorescence methods were studied and the corresponding association constants of complexes and the recognition sensitive factors were determined by the modified H B equation. The recognition mechanism between MMC MAC(O 5) and metal ion was discussed based on the chemical structure of MMC MAC(O 5) and the fluorescence enhancement effect. Because the carbonyl group of the coumarin participates to the recognition process between the crown ether and the cation, the association constants of the complexes with alkali cations were increased obviously. WT5HZ]