Mao-Juan Tian, Hua-Qing Tian, Tao Jiang, Huan-Huan Yu, Chao Huang, Bi-Xue Zhu, Chun Zhu
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引用次数: 0
摘要
成功合成并表征了一种含有吡啶-2,6-二甲酰胺支架的外消旋水杨醛席夫碱(L)。在 THF/H2O 混合溶剂中,L 表现出典型的聚集诱导发射(AIE)特征。紫外可见吸收光谱和荧光发射光谱显示,在 THF/H2O 溶液(2:3)中,L 对 Cu2+ 的识别具有较高的选择性和灵敏度,表明 L 可用作 Cu2+ 的熄灭荧光探针。利用约伯图法、紫外可见光谱滴定法和荧光光谱滴定法估算了探针 L 对 Cu2+ 的化学计量比、关联常数和检测限。更重要的是,利用探针 L 与 Cu2+ 的配位相互作用合成了一种 Cu(II)配合物,并利用 X 射线晶体衍射技术对其进行了表征。晶体结构很好地展示了 L 与 Cu2+ 的结合模式,有助于进一步了解配位机理。
A helical salicylaldehyde Schiff base exhibiting aggregation-induced emission and selective recognition of Cu2+ ions
A racemic salicylaldehyde Schiff base (L) containing a pyridine-2,6-dicarboxamide scaffold was successfully synthesized and characterized. L exhibited a typical aggregation-induced emission (AIE) characteristic in the mixed solvent of THF/H2O. The UV–Vis absorption spectra and fluorescence emission spectra showed a high selectivity and sensitivity of L for the recognition of Cu2+ over other ions in the solution of THF/H2O (2:3), and indicated L can be used as a turn-off fluorescent probe for Cu2+. The stoichiometric ratio, association constant, and the detection limit of probe L toward Cu2+ were estimated using Job's plot method, UV–Vis spectra titration, and fluorescence spectra titration. More importantly, a Cu(II) complex was synthesized from the coordination interaction of probe L with Cu2+ and characterized by X-ray crystal diffraction technique. The crystal structure well illustrated the binding mode of L with Cu2+, contributing to the further understanding of the coordination mechanism.
期刊介绍:
Tetrahedron publishes full accounts of research having outstanding significance in the broad field of organic chemistry and its related disciplines, such as organic materials and bio-organic chemistry.
Regular papers in Tetrahedron are expected to represent detailed accounts of an original study having substantially greater scope and details than that found in a communication, as published in Tetrahedron Letters.
Tetrahedron also publishes thematic collections of papers as special issues and ''Reports'', commissioned in-depth reviews providing a comprehensive overview of a research area.