title: Supramolecular assembly in a Janus-type urea system.
abstract: A pyrazolyl urea ligand adopts two possible conformations with the urea NH groups directed either outward or inward. Metal coordination enforces the outward conformation resulting in either anion complexation or self-association and hence extended supramolecular assemblies including a hexameric barrel that persists in solution.
authors.affiliation: Institute of Chemical Sciences, School of Engineering and Physical Sciences, William Perkin Building, Heriot-Watt University, Edinburgh, EH14 4AS, Scotland, UK. g.o.lloyd@hw.ac.uk.
authors.forename: Gareth O
authors.initials: GO
authors.lastname: Lloyd
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Steed