Convenient synthesis and anion recognition property of acylhydrazone-based molecular tweezer receptors
作者:HAI-XIAN REN、MING-GEN ZHAO、YING-JIN WANG
DOI:10.3906/kim-0903-47
日期:——
Three acylhydrazone-based compounds were designed as novel neutral sensors for anions, and synthesized by simple steps in good yields. Their anion recognition properties were studied by UV-vis and ^1H-NMR spectroscopy. The results showed that the receptors 1, 2, and 3 all had a better selectivity for F^- and CH_3COO^-, but no evident binding with Cl^-, Br^-, I^-, NO_3^-, H_2PO_4}^-, or HSO_4}^-. The results indicated that anion recognition was achieved via convergent hydrogen bond interactions from acylhydrazone functionality on the side arms. The UV-vis data indicated that a 1:1 stoichiometry complex was formed between compounds 1, 2, or 3 and anions. The binding and selectivity were also tuned by the change of the place of the nitro group attached to the phenyl. Moreover, receptor 3 can act as the colorimetric sensor for such anions as F^- and CH_3COO^-, and the recognition mechanism and binding mode were discussed.
研究人员设计了三种酰基肼基化合物作为新型阴离子中性传感器,并通过简单的步骤合成了这些化合物,产量良好。 通过紫外-可见光谱和^1H-核磁共振光谱研究了它们识别阴离子的特性。 结果表明,受体 1、2 和 3 对 F^- 和 CH_3COO^- 都有较好的选择性,但与 Cl^-、Br^-、I^-、NO_3^-、H_2PO_4}^- 或 HSO_4}^- 没有明显的结合。 结果表明,阴离子的识别是通过侧臂上酰基腙官能团的聚合氢键相互作用实现的。 紫外-可见光数据表明,化合物 1、2 或 3 与阴离子之间形成了 1:1 的化学计量复合物。 通过改变连接到苯基上的硝基的位置,还可以调整结合力和选择性。 此外,受体 3 还可以作为 F^- 和 CH_3COO^- 等阴离子的比色传感器,并讨论了其识别机制和结合模式。