Reversible reduction drives anion ejection and C60 binding within an FeII 4L6 cage
Zhenpin Lu1, Tanya K Ronson1, Jonathan R Nitschke1
1Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK jrn34@cam.ac.uk.
Abstract:
FeII 4L6 tetrahedral cage 1 was prepared from a redox-active dicationic naphthalenediimide (NDI) ligand. The +20 charge of the cage makes it a good host for anionic guests, with no binding observed for neutral aromatic molecules. Following reduction by Cp2Co, the cage released anionic guests; subsequent oxidation by AgNTf2 led to re-uptake of anions. In its reduced form, however, 1 was observed to bind neutral C60. The fullerene guest was subsequently ejected following cage re-oxidation. The guest release process was found to be facilitated by anion-mediated transport from organic to aqueous solution. Cage 1 thus employs electron transfer as a stimulus to control the uptake and release of both neutral and charged guests, through distinct pathways.
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