This article describes investigations into the development of supramolecular systems capable of sensing anions through either displacement type assays or molecular motion. An electron deficient naphthalene diimide thread and an electron rich isophthalamide naphthohydroquinone macrocycle were shown to form a coloured pseudorotaxane assembly. Investigations into the ability of such interpenetrated systems to sense anions colorimetrically were undertaken. Anion complexation at the isophthalamide group of the macrocycle causes displacement of the naphthodiimide thread resulting in the loss of colour. The enhanced mechanically bonded binding strength between the naphthodiimide axle and the naphthohydroquinone groups of the macrocycle wheel in the corresponding rotaxane structure, however, was found to negate the anion induced displacement process.
这篇文章介绍了对能够通过位移检测或分子运动来感知阴离子的超分子系统的开发研究。研究表明,缺电子的
萘二
亚胺线和富含电子的间苯二甲酰胺
萘氢醌大环可形成有色的假
紫杉烷组装体。研究人员对这种互穿系统以比色法感知阴离子的能力进行了调查。阴离子与大环的间苯二甲酰胺基团发生络合,导致
萘二
亚胺线位移,从而失去颜色。然而,在相应的轮烷结构中,
萘二
亚胺轴与大循环轮的
萘氢醌基团之间的机械结合强度增强,从而抵消了阴离子引起的位移过程。