高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (12): 1824.

• 论文 • 上一篇    下一篇

(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

李隆弟, 吴应光, 张众笑, 童爱军   

  1. 清华大学化学系, 北京 100084
  • 收稿日期:1999-11-08 出版日期:2000-12-24 发布日期:2000-12-24
  • 通讯作者: 李隆弟(1939年出生),男,教授,博士生导师,主要从事光致发光分析和分子识别方面的研究.
  • 基金资助:

    国家自然科学基金(批准号:29575202)资助

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

LI Long-Di, WU Ying-Guang, ZHANG Zhong-Xiao, TONG Ai-Jun   

  1. Department of Chemistry, Tsinghua University, Beijing 100084, China
  • Received:1999-11-08 Online:2000-12-24 Published:2000-12-24

PDF (PC)

被引次数

34

摘要： 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

关键词: (7-甲氧基-4-亚甲基)香豆素基-单氮杂-18-冠-6, 阳离子识别, 稳定常数, 机理

Abstract: The cation recognition properties of the title luminescent ionophore MMC-MAC(O5) 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 Bequation.The recognition mechanism between MMC-MAC(O5) and metal ion was discussed based on the chemical structure of MMC-MAC(O5) 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

Key words: 7-Methoxy-4-methene-coumarin-monoaza-18-crown-6, Cation recognition, Association constant, Mechanism

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