Assembly and Adsorption Properties of Seven Supramolecular Compounds with Heteromacrocycle Imidazolium

Seven
supramolecular compounds comprising multivalent imidazolium
macrocycles and metal halides, {[MC-IM]­[Ag2I4]}n (1), {[PC-IM]2[Ag7I11]}n (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.