Abstract
Self-assembled molecular capsules are formed on crystallisation of calix[5]arenesulfonic acid resulting from treating calix[5]arene with sulfuric acid; the calix[5]arenesulfonic acid molecules dimerise via hydrogen bonding through the sulfonic acid groups, shrouding two hydrogen-bonded sulfuric acid molecules as the supermolecule [(H2SO4)2}⊂{(calix[5]arenesulfonic acid)2].
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