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New Scaffolds for Supramolecular Chemistry: Upper-Rim Fully Tethered 5-Methyleneureido-5′-methyl-2,2′-bipyridyl Cyclodextrins
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2002
Year
Inorganic ChemistryMolecular Redox SwitchSupramolecular AssemblyEngineeringBiochemistryPhotochemistryTethered CyclodextrinsNatural SciencesCoordination ComplexNew ScaffoldsMolecular SwitchPhosphine ImideMolecular ComplexChemistrySupramolecular ChemistryBiomolecular EngineeringHost-guest Chemistry
Seven upper-rim fully tethered cyclodextrins (URFT-CDs) have been synthesised in a good average coupling yield using the one-step "phosphine imide" approach and their metal complexation behaviour with lanthanides and transition metals was explored. We observed that the A-TE-E light conversion process (antennae effect) occurs in the URFT-CD lanthanide complexes. A molecular redox switch based on the corresponding iron complexes is also reported. A reversible intramolecular translocation of the FeII and FeIII ions, between two distinct binding cavities has been monitored spectroscopically and achieved by chemical triggering. Finally, a negative allosteric control of ion recognition through the formation of a CD pseudocryptand is discussed.