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A pillar[5]arene decaamine has been synthesized and revealed to encapsulate linear diacids in neutral, alkaline, and acidic conditions, driven by the hydrophobic and electrostatic interactions, to give rise to pseudo[2]rotaxanes. Ion pair-bonded stoppers can further lock the diacids to generate stable
![Graphical abstract: Pillar[5]arene decaamine: synthesis, encapsulation of very long linear diacids and formation of ion pair-stopped [2]rotaxanes](http://hg.y866.cn/compound/lib/scimg/usr/1/C1CC10633C.jpg)
