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Supramolecular assemblies of 2,2'-biimidazole with 5-sulfosalicylic acid and 3,4,5-trihydroxybenzoic acid, have been synthesized and characterized by single-crystal X-ray diffraction methods. Both the two proton-transfer compounds of 2,2'-biimidazole with 3-carboxy-4-hydroxybenzenesulfonic acid (5-sulfosalicylic acid, 5-SSA) [namely bis(2-(2-1H-imidazolyl)-1H-imidazolium) 4-hydroxybenzene-3-carboxylate-1-sulfonate monohydrate, 2(C6HTN4)^+· CTH4068^2-.H2O, (Ⅰ)] and 3,4,5-trihydroxybenzoic acid [namely 2,2'-bi-1H-imidazolium bis(3,4,5-trihydroxybenzoate) tetrahydrate, C6H8N4^2+ ·2(C7H5O5)^-·4(H20), (Ⅱ)] feature extensively hydrogen-bonded three-dimensional network structures having significant interlayer n-n interactions between the cation and anion species. In Ⅰ, a 5-SSA^2- dianionic species results from deprotonation of both the sulfonic and the carboxylic acid groups, all available O-atom acceptors interact with all cation and water molecule donors by hydrogen bonds. In Ⅱ, the formula unit displays a crystallographic inversion symmetry. The structural information about the two complexes between 2,2'-biimidazole compound and benzenecarboxylic acids obtained in this work will be particularly important for the rational design of supramolecular organic functional materials. 相似文献
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