Herein we report the experimental observation (X-ray characterization) of an anion–anion complex (anion = hydrogen fumarate) stabilized by H-bonds that is trapped in a secondary squaramide receptor. High level ab initio calculations indicate that the anion–anion complex is thermodynamically unstable but kinetically stable with respect to the isolated anions.
R. Prohens, A. Portell, M. Font-Bardia, A. Bauzá and A. Frontera, Chem. Commun., 2018, 54, 1841 DOI: 10.1039/C7CC09241E
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