Mining 2:2 Complexes from 1:1 Stoichiometry: Formation of Cucurbit[8]uril−Diarylviologen Quaternary Complexes Favored by Electron-Donating Substituents
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Abstract
A 1:1 binding stoichiometry of a host−guest complex need not consist of a single host and guest. Diarylviologens containing electron-donating substituents complexed with cucurbit[8]uril (CB[8]) in a 1:1 stoichiometry exhibit abnormally large binding enthalpies compared to typical enthalpy changes observed for 1:1 binary complexes. Here, several CB[8]-mediated host−guest complexes, which were previously reported as 1:1 binary complexes, are verified to be 2:2 quaternary complexes by a combination of isothermal titration calorimetry,
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1520-5126
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European Commission (607602)
Engineering and Physical Sciences Research Council (EP/L504920/1)