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β ‐Cyclodextrin‐Assisted Intervalence Charge Transfer in Mixed‐Valent [2]Rotaxane Complexes Having Metal Centers Linked by an Interrupted π‐Electron System
Author(s) -
Shukla Atindra D.,
Bajaj H. C.,
Das Amitava
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20010119)40:2<446::aid-anie446>3.0.co;2-n
Subject(s) - rotaxane , charge (physics) , electron transfer , cyclodextrin , metal , electron , chemistry , crystallography , materials science , photochemistry , physics , supramolecular chemistry , crystal structure , organic chemistry , quantum mechanics
Fe II to Ru III 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 (see picture). The rotaxanes are synthesized by using Ru III and Fe II 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.