Anion binding in aqueous media by a tetra-triazolium macrocycle
作者:Nicholas G. White、Sílvia Carvalho、Vítor Félix、Paul D. Beer
DOI:10.1039/c2ob25934f
日期:——
Three tetra-triazole macrocycles were synthesized in good yields by the copper(I)-catalysed cycloaddition of bis-triazole azides and bis-alkynes. One of these was alkylated to give a cyclic tetra-triazolium receptor, which complexes anions strongly in competitive DMSO–water mixtures. In 1 : 1 DMSO–water, the tetracationic receptor exhibits a preference for the larger halides, bromide and iodide, with all halides associating more strongly than the oxoanion, acetate. The sulfate dianion is complexed far more strongly than any of the monobasic anions (Ka > 104 M−1). Quantum mechanics/molecular mechanics simulations corroborate the experimentally determined anion binding selectivity trends.
通过铜(I)催化双三唑叠氮化物和双炔的环加成反应,以良好的收率合成了三个四三唑大环化合物。其中一种被烷基化,形成环状四三唑受体,该受体在竞争性 DMSO-水混合物中与阴离子强烈络合。在 1 : 1 DMSO-水中,四阳离子受体表现出对较大卤化物、溴化物和碘化物的偏好,所有卤化物的缔合都比含氧阴离子、乙酸盐更强。硫酸盐二价阴离子的络合能力远强于任何一元阴离子 (Ka > 104 M−1)。量子力学/分子力学模拟证实了实验确定的阴离子结合选择性趋势。