Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah 711103, India.
Talanta. 2011 Oct 15;85(5):2673-80. doi: 10.1016/j.talanta.2011.08.040. Epub 2011 Aug 26.
Five new chromogenic tripodal receptors (2a-e) containing electron withdrawing and donating groups appended to the azophenol moiety were synthesized, characterized, and their chromogenic behaviors toward various anions were investigated. These tripodal receptors showed a distinct color change only when treated with fluoride ions in CH(3)CN solution. Yet, other anions such as Cl(-), Br(-), I(-), NO(3)(-), ClO(4)(-), AcO(-), HSO(4)(-), and H(2)PO(4)(-) could not cause any color change. Thus, the receptors 2a-e can be used as a colorimetric chemosensor for the determination of fluoride ion. In addition, (1)H NMR experiments were carried out to explore the nature of interaction between tripodal receptors and fluoride. Finally, analytical application and the use of test strip of the receptor 2b to detect fluoride was also reported.
五种新的显色三脚受体（2a-e）被合成，其中包含了连接到偶氮苯部分的吸电子和供电子基团，并对其对各种阴离子的显色行为进行了研究。这些三脚受体仅在 CH(3)CN 溶液中与氟离子反应时才会发生明显的颜色变化。然而，其他阴离子，如 Cl(-)、Br(-)、I(-)、NO(3)(-)、ClO(4)(-)、AcO(-)、HSO(4)(-)和 H(2)PO(4)(-)，则不能引起任何颜色变化。因此，受体 2a-e 可以用作测定氟离子的比色化学传感器。此外，还进行了（1）H NMR 实验，以探索三脚受体与氟离子之间相互作用的性质。最后，还报告了受体 2b 用于检测氟离子的分析应用和测试条的使用。
