Unprecedented host-induced intramolecular charge-transfer complex formationElectronic supplementary information (ESI) available: synthetic procedure and characterization data of 1 and 2. See http://www.rsc.org/suppdata/cc/b2/b208280b/

Abstract

For the first time, host-induced intramolecular charge-transfer complex formation in a guest containing both an electron donor and an electron acceptor is demonstrated in the cucurbit[8]uril cavity, leading to unusual back-folding of the guest molecule.