新型双-1,2-酰胺桥联杯[4]芳烃对碱金属苦味酸盐的加合性质

Determination of the association constant of a double-1, 2-amide-bridged calix[4] arene with potassium or rubidium picrate

杯芳烃依据其空穴的大小和性质而对离子具有选择性加合的能力,这可用作离子的分离和识别 作者利用氨解杯[4]芳烃酯合成新型双 1,2 酰胺桥联杯[4]芳烃,用紫外光度法研究它对碱金属苦味酸盐的加合性质,24℃时在CHCl3介质中,测得其对钾、铷的加合常数Ka,表明该杯[4]芳烃对碱金属K+。

Calixarenes possessing appropriate cavity size and rigid structure can lead to a very high ion selectivity, which can be used for recognition and separation of ions. A new lower rim double-1,2-amide-bridged calix[4]arene was synthesized by aminolysis of a calix[4]arene ester. The binding abi-lities of the compound with potassium and rubidium ions were determined by the ultraviolet method. The association constants (K_a) for potassium picrate and rubidium picrate at 24°C in CHCl_3 are measured respectively. The results show that the new double-1,2-amide-bridged calix[4]arene have strong inclusion ability for the guest K^+and Rb^+ions.