A stable paramagnetic calix[4]arene(III) bearing two nitroxide groups on the upper rim is synthesized, which exhibits a strong intramolecular spin–spin exchange interaction and is found to be able to undergo reversible conformational transitions upon heating.
![Graphical abstract: Synthesis and reversible thermo-induced conformational transitions of a stable nitroxide biradical based on calix[4]arene](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B201010K&imageInfo.ImageIdentifier.Year=2002)
Q. Wang, Y. Li and G. Wu, Chem. Commun., 2002, 1268 DOI: 10.1039/B201010K
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