The tetracationic macrocycle cyclo[2](2,6-di(1H-imidazol-1-yl)pyridine)[2](1,4-dimethylenebenzene) hexafluorophosphate (1(4+)·4PF(6)(-)) acts as a large, flexible "molecular box" that supports the formation of environmentally responsive anion-induced pseudorotaxanes, as well as other extended structures, including metal-linked supramolecular polyrotaxanes. Specifically, the combination of the tetracation 1(4+) and bis-carboxylate guests derived from 4,4'-biphenyldicarboxylic acid and 2,6-naphthalenedicarboxylic acid results in the formation of pseudorotaxanes that respond to changes in environmental stimuli, including pH and temperature. The resulting structures can be "locked into place" via the addition of a metal-linker in the form of Ag(I); this gives rise to an ordered metal-linked polyrotaxane. The interpenetrated constructs described in this article were characterized in solution and in the solid state by one- and two-dimensional ((1)H and NOESY) NMR spectroscopy, as well as by mass spectrometry (ESI-MS) and single-crystal X-ray diffraction methods.

中文翻译：

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阴离子诱导的假轮烷的环境响应性穿线、脱线和固定

四阳离子大环环[2](2,6-二(1H-咪唑-1-基)吡啶)[2](1,4-二亚甲基苯)六氟磷酸酯(1(4+)·4PF(6)(-))作为一个大而灵活的“分子盒”，支持形成环境响应性阴离子诱导的假轮烷，以及其他扩展结构，包括金属连接的超分子聚轮烷。具体而言，四阳离子 1(4+) 和衍生自 4,4'-联苯二甲酸和 2,6-萘二甲酸的双羧酸客体的组合导致形成对环境刺激（包括 pH 值和温度。通过添加 Ag(I) 形式的金属连接体，可以将所得结构“锁定到位”；这产生了有序的金属连接的聚轮烷。