title: Supramolecular circular helicates formed by destabilisation of supramolecular dimers.
abstract: The effect of changes in the angles at the connection points of linear/circular helicates is explored as a route to control the nuclearity and architecture of metallo-supramolecular arrays. This effect is probed by changing the geometry of the metal centre used to assemble bis-pyridylimine ligands that contain a 1,3-bis(aminomethyl) benzene spacer group. Tetrahedral metal ions favour linear dimers, whereas octahedral nickel(II) predominantly gives a triangular circular helicate. Five-coordinate copper(II) falls in the middle of these extremes and results in the formation of solvent-dependent mixtures of dimer and trimer. The trinuclear, triangular, circular helicate structures, which result from coordination to copper(II) and nickel(II), are structurally characterised by X-ray crystallography and reveal that the units can aggregate into hexagonal arrays that contain anion-filled tube-like channels in the solid state.
authors.affiliation: Department of Chemistry, University of Leicester, Leicester, UK.
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Hamblin
authors.forename: Floriana
authors.initials: F
authors.lastname: Tuna
authors.forename: Siona
authors.initials: S
authors.lastname: Bunce
authors.forename: Laura J
authors.initials: LJ
authors.lastname: Childs
authors.forename: Alexander
authors.initials: A
authors.lastname: Jackson
authors.forename: William
authors.initials: W
authors.lastname: Errington
authors.forename: Nathaniel W
authors.initials: NW
authors.lastname: Alcock
authors.forename: Helene
authors.initials: H
authors.lastname: Nierengarten
authors.forename: Alain
authors.initials: A
authors.lastname: Van Dorsselaer
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Leize-Wagner
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Hannon
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D008024:Ligands; D009532:Nickel / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D008024:Ligands; D011725:Pyridines; C526051:6-methylpyridine-2-carboxaldehyde; D012834:Silver; D003300:Copper; D009532:Nickel