In the presence of 1,2-bis(4,4′-dipyridinium)ethane, p-sulfonatocalix[5]arene (C5AS) adopts an unseen partial-cone conformation to form back-to-back dimers, whereas C5AS crystallizes in face-to-face dimers to form a wavy layer, rather than the expected bilayer, arrangement upon complexation with 1,2-bis(pyridinium)ethane.
![Graphical abstract: Unique conformation and packing structure of p-sulfonatocalix[5]arene induced by 1,2-bis(pyridinium)ethane compounds](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B603569H&imageInfo.ImageIdentifier.Year=2006)
D. Guo, H. Zhang, C. Li and Y. Liu, Chem. Commun., 2006, 2592 DOI: 10.1039/B603569H
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