Fe to Ru electron transfer is initiated by the inclusion of saturated bridging ligands into the β-cyclodextrin (CD) cavity of [2]rotaxane complexes and is observed as an intervalence charge transfer (IVCT) band in the electronic spectra. The rotaxanes are synthesized by using Ru and Fe complexes as stoppers, β-CD as the cyclic molecular head, and 4,4'-bipyridine derivatives with interrupted π-electron system as the bridging ligand between the metal centers.
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