structures verified by NMR spectroscopy. Competitive solvent extractions of alkaline earth metal cations from aqueous solutions into chloroform were performed and the results compared with those reported previously for di-ionizable p-tert-butylcalix[4]arene-crown-6 analogues to probe the influence of the para-substituent on the calix[4]arene scaffold on extraction selectivity and efficiency.
将两个
羧酸或N-(X)磺酰基羧酰胺基团掺入杯[4]
芳烃-冠-6化合物中,以提供可二离子化的
配体,用于二价
金属离子分离。通过改变X的吸电子特性来调节N-(X)磺酰基羧酰胺基团的酸度。通过不同的合成策略获得了圆锥,部分圆锥和1,3-交替构象,并通过NMR光谱证实了它们的结构。进行了竞争性溶剂从
水溶液中萃取碱土
金属阳离子到
氯仿中的分析,并将结果与先前报道的可电离的对叔丁基杯[4]
芳烃-冠-6类似物进行了比较,以探讨对位取代基的影响在杯[4]
芳烃支架上对提取的选择性和效率的影响。