Supramolecular Assemblies in Salts of 2,2'-Biimidazole with 5-Sulfosalicylic Acid and 3,4,5-Trihydroxybenzoic Acid

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2007,（11）
• 页码范围: 1715-1721
• 页数: 7页
• 语种: 英文

摘要

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 structures having significant interlayer π-π interactions between the cation and anion species. In Ⅰ, a 5-SSA2- 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.