Securing a Supramolecular Architecture by Tying a Stopper Knot. (27th May 2018)

• Record Type: Journal Article
• Authors: Leigh, David A.; Pirvu, Lucian; Schaufelberger, Fredrik; Tetlow, Daniel J.; Zhang, Liang
• Is Part Of: Angewandte Chemie. Volume 130:Number 33(2018)
• Page Start: 10644
• Page End: 10648
• Publication Date: 2018-05-27
• Subjects: Chemische Topologie -- Molekulare Knoten -- Rotaxane -- Supramolekulare Chemie; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201803871
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: We report on a rotaxane‐like architecture secured by the in situ tying of an overhand knot in the tris(2, 6‐pyridyldicarboxamide) region of the axle through complexation with a lanthanide ion (Lu 3+ ). The increase in steric bulk caused by the knotting locks a crown ether onto the thread. Removal of the lutetium ion unties the knot, and when the axle binding site for the ring is deactivated, the macrocycle spontaneously dethreads. When the binding interaction is switched on again, the crown ether rethreads over the 10 nm length of the untangled strand. The overhand knot can be retied, relocking the threaded structure, by once again adding lutetium ions.