Abstract
Design and synthesis of artificial systems for regulation of ion recognition utilizing external information at molecular level, i.e. metal ion, electron, organic molecule, are described. Pseudocrowns formed by coordination of heavy metal ion as an effector are useful frameworks for controlling recognition of metal ions and provide an interesting feature for construction of a chiral host because of their molecular chirality. Structural change of recognition site induced by redox reactions between thiol and disulfide is also a very effective way of regulating ion recognition. In particular, a new concept of redox gate affords one of the most ideal systems for perfect switching (quantitative interconversion, completely different ion affinity between the two redox forms, stability toward autoxidation) of Ag+ recognition. A system controlling metal binding is also described which is constructed by molecular assembling via triple hydrogen bonding between a receptor and guests containing a short polyether chain.
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