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Pillars of salts: By combining planar cations and planar anionic structures based on π-conjugated acyclic dipyrroles containing an anion, charge-by-charge assemblies could be formed (see picture). Not only crystals but also soft materials, such as supramolecular gels and thermotropic liquid crystals, could be made by this method.
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Haketa et al. (2010) studied this question.
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