title: Unusual variations in the incidence of Z' > 1 in oxo-anion structures.
abstract: A series of Cambridge Structural Database studies show that ionic species generally form low Z' structures, even in those cases where charge assisted hydrogen bonding is a key feature, e.g. oxo-anion complexes. By introducing a competing pi-pi stacking interaction, two oxo-anion compounds are shown to crystallise with more than one molecule in the asymmetric unit, including the first hydrogen phosphate containing structure to have Z' > 2.
authors.affiliation: Department of Chemistry, University of Durham, South Road, Durham, UKDH1 3LE.
authors.forename: Kirsty M
authors.initials: KM
authors.lastname: Anderson
authors.forename: Andres E
authors.initials: AE
authors.lastname: Goeta
authors.forename: Kirsty S B
authors.initials: KS
authors.lastname: Hancock
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Steed