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Two novel supramolecular assemblies have been constructed by p -sulfonatocalix[4]arene ( C4AS ) and viologen guests, showing that C4AS presents the supramolecular architecture of spectacular polymeric capsules in the presence of benzyl viologen, whereas it forms a simple host−guest 2:1 complex with methyl viologen.
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Guo et al. (2008) studied this question.
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