[2]Rotaxane molecular shuttles employing 1,2-bis(pyridinium)ethane binding sites and dibenzo-24-crown-8 ethersElectronic supplementary information (ESI) available: 1H NMR chemical shifts. See http://www.rsc.org/suppdata/cc/b0/b004784h/
Abstract
Symmetrical and unsymmetrical axles containing two binding
sites of the 1,2-bis(pyridinium)ethane type are threaded with a single
molecule of dibenzo-24-crown-8 ether (DB24C8) resulting in