title: An expanded cavity hexaamine cage for copper(II).
abstract: The crystal structure of the bicyclic hexaamine complex [Cu(fac-Me5-tricosane-N6)](ClO4)2.H2O (fac-Me5-tricosane-N6 = facial-1,5,9,13,20-pentamethyl-3,7,11,15,18,22-hexaazabicyclo[7.7.7]tricosane) at 100 K defines an apparently tetragonally compressed octahedral geometry, which is attributed to a combination of dynamic interconversion and static disorder between two tetragonally elongated structures sharing a common short axis. This structure is fluxional at 60 K and above as shown by EPR spectroscopy. Aqueous cyclic voltammetry reveals that a remarkably stable Cu(I) form of the complex is stabilised by the encapsulating nature of the expanded cage ligand.
authors.affiliation: Department of Chemistry, University of Queensland, Brisbane, Qld 4072, Australia. P.Bernhardt@uq.edu.au
authors.forename: Paul V
authors.initials: PV
authors.lastname: Bernhardt
authors.forename: Richard
authors.initials: R
authors.lastname: Bramley
authors.forename: Rodney J
authors.initials: RJ
authors.lastname: Geue
authors.forename: Stephen F
authors.initials: SF
authors.lastname: Ralph
authors.forename: Alan M
authors.initials: AM
authors.lastname: Sargeson