Assembly and Adsorption Properties of Seven Supramolecular Compounds with Heteromacrocycle Imidazolium

Seven supramolecular compounds comprising multivalent imidazolium macrocycles and metal halides, {[MC-IM][Ag₂I₄]} (1), {[PC-IM]₂[Ag₇I₁₁]} (2), {[ODC-IM][Ag₃I₇]} (3), {[ODC-IM][Bi₂I₁₀]} (4), {[MDC-IM][Bi₂I₁₀]} (5), {[PDC-IM][Bi₂I₁₀]} (6), and {[MDC-IM][HgI₄]} (7), have been synthesized by solvothermal reactions and structurally characterized by IR spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. Notably, the three tetravalent imidazolium macrocycles were introduced for the first time and the extended anion structures are featured with three-dimensional coordination networks, one-dimensional chains, or zero-dimensional oligomers. This new study attempts to not only fill the gap in this supramolecular hybrid area that has been neglected but also enrich the type of imidazolium cyclophane. It is important that good efforts were devoted to study the adsorption properties of supramolecular compounds. Compound 5 exhibited great adsorption performance for organic dyes methylene blue, methyl orange, and rhodamine B (RhB) and can be evaluated as a potential candidate for industrial wastewater treatment.