含嘧啶环的双冠醚(Ⅳ)

Bis-crown Ether Containing Pyrmidine Ring(Ⅳ)

前文已报道由啶环桥联两个苯并冠醚的双冠醚的合成与性质。由于嘧啶环的刚性较大,能把两个冠醚单元固定在有效地协同作用位置,因此以它们作中性载体的离子选择性电极具有较好的选择性。为了进一步研究这类双冠醚的性质,我们合成了四种嘧啶环桥联两个脂肪族冠醚的双冠醚,并经元素分析、IR、′HNMR鉴定。

Four bis crony ethers containing 12-crown-4 (1,3)and 15-crown-5(2, 4)moieties bridged by pyrimidine ring were synthesized. Sodium and potassium ion selective PVC membranee electrodes based on these his-crown ethers(1,3) and(2, 4) were prepared andelectrode behaviours were evaluatd.The results indicate that the electrodes(1,3) and (2,4)exhibited better selectivity of sodium and potassium ions than all other alkali and alkaline earth metal calions.