Quadruple hydrogen-bonding interactions stabilized the mixed-valence states of dimers of triarylamine derivatives bearing an ureido pyrimidinedione moiety without any electronic coupling. This study represents the first example of proton-coupled “organic” mixed valency in solution with different substituents being used to control the stability.
K. Tahara, T. Nakakita, S. Katao and J. Kikuchi, Chem. Commun., 2014, 50, 15071 DOI: 10.1039/C4CC06779G
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