Abstract
Mixed N,S tripodal ligands bis(2,4-dimethylphenylthioethyl)(2-methylbenzimidazolyl)amine L1, bis(2,4-dimethylphenylthioethyl)(1-methyl-2-methylbenzimidazolyl)amine L2, and bis(1-methyl-2-methylbenzimidazolyl)(2-methylthioethyl)amine L3 were employed to prepare the corresponding copper complexes. L1 and L2 associate weakly with Cu2+, while the reaction of CuI with L1 affords [L1CuI]. This was characterized in the solid state by the chelating tridentate coordination mode of L1, with a free thioether, and a terminal iodide, in contrast with the commonly observed Cu–I–Cu bridges. For L3, Cu+ and Cu2+ complexes are accessible as [L3Cu]PF6, and the crystallographically characterized [L3CuCl]Cl. The latter has a square pyramidal coordination around the Cu2+ ion, with the thioether as an axial ligand that remains coordinated in solution, as evidenced by UV–Vis spectroscopy.
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