Abstract
AbstractComplex formation of quaterimidazole with FeII, CoII, and NiII yielded dinuclear triple helicates in the solution state by the self‐assembling ability of the ligand based on the strong chelating coordination bonds. Crystallization of the CoII complex from aqueous solution afforded the CoIII complex with a triple‐helical structure. X‐ray crystal structure analyses revealed that the helicates are linked through N–H···X hydrogen bonds with counteranions and solvent molecules to form three‐dimensional networks. The spectrophotometric titration experiment showed that quaterimidazole forms triple helicates with various d‐block transition metal ions with high selectivity. The outward intermolecular interactions and high stability of the helicates from the rigid molecular structures combined with the intramolecular π–π interactions of imidazole moieties and their strong chelating coordination enabled the successful optical resolution of right‐ and left‐handed helicates by chiral‐column HPLC.
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