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通过溶剂热方法合成了一个由氢键拓展的携带路易斯碱位的三维超分子配位聚合物:{[Cd(HTZ-IP)(HPYTZ)(H_2O)_2]·5H_2O}n(HTZ-H_2IP=5-(5-四氮唑基)间苯二甲酸;HPYTZ=3,5-(4-吡啶基)-1,2,4-三唑]。X射线单晶衍射结果表明,中心镉离子由含氮杂环羧酸配体和富氮辅助配体连接成“有悬挂手臂”的一维链,而链间则凭借配位水和2个配体的氢键作用拓展成三维超分子化合物。有趣的是配合物存在大量裸露的未配位的N原子,此N原子具有路易斯碱性质,能与路易斯酸性质的Ag~+有效结合,从而引起配合物的荧光猝灭。该性质能在无色溶液中有效检测10~(-4)~10~(-6) mol·L~(-1)范围内的痕量Ag~+离子。
A three-dimensional supramolecular coordination polymer with Lewis base was synthesized by the solvothermal method, which was extended by hydrogen bonds: {[Cd (HTZ- IP) (HPYTZ) (H 2 O) 2] 5H 2 O} n (HTZ-H 2 IP = (5-tetrazolyl) isophthalic acid; HPYTZ = 3,5- (4-pyridyl) -1,2,4-triazole]. The X-ray diffraction results showed that the central cadmium ion consisted of Nitrogen-containing heterocyclic carboxylic acid ligands and nitrogen-rich ancillary ligands are linked into a one-dimensional chain with “arms”, and the inter-chain expands into three-dimensional supramolecules by virtue of the coordination between water and two ligands Compounds.It is interesting that the complex exists a large number of naked uncoordinated N atoms, the N atom has a Lewis base property, can effectively combine with the Lewis acid nature of Ag ~ +, resulting in the fluorescence quenching of the complex. The trace Ag ~ + ions in the range of 10 ~ (-4) ~ 10 ~ (-6) mol·L ~ (-1) were effectively detected in a colorless solution.