Allosteric-Controlled Metal Specificity of a Ditopic Ligand

摘要

There are numerous examples in the field of metallosupra-molecular chemistry that demonstrate that careful design of ligands can produce species that are selective to certain metal ions.For example,Lehn et al.demonstrated that a mixture of two ligands that contain three bipyridine units and are linked either by aliphatic or ether units form only homonu-clear and homoleptic trinuclear double and triple helicates upon reaction with Cu~+ and Ni~(2+) ions,respectively.