title: Asymmetric synthesis of mono- and dinuclear bis(dipyrrinato) complexes.
abstract: The diastereoselective syntheses of Zn(II) bis(dipyrrinato) helicates is reported, involving ligands templated by the incorporation of homochiral binol within the linker joining the two dipyrrinato units. The most diastereoselective formation of dinuclear bis(dipyrrinato) helicates to date is reported. The formation of either mononuclear or dinuclear helicates can be tuned by varying the length of the linker between the dipyrrinato units and by varying the complexation procedure. The neutral dipyrrinato helicates were readily analyzed by HPLC to ascertain diastereoselectivity, and circular dichroism studies revealed the helical nature of the complexes. The molar ellipticities of the helicates produced by diastereoselective complexation are very large in the visible region and typically correspond to binol moieties in the UV region. Extensive X-ray crystallographic investigations further confirmed the helicity of the mononuclear Zn(II) helicates and identified significant interlayer displacement and bending within crystals.
authors.affiliation: Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4J3, Canada.
authors.forename: Adeeb Al-Sheikh
authors.initials: AA
authors.lastname: Ali
authors.forename: Ronald E
authors.initials: RE
authors.lastname: Benson
authors.forename: Sascha
authors.initials: S
authors.lastname: Blumentritt
authors.forename: T Stanley
authors.initials: TS
authors.lastname: Cameron
authors.forename: Anthony
authors.initials: A
authors.lastname: Linden
authors.forename: David
authors.initials: D
authors.lastname: Wolstenholme
authors.forename: Alison
authors.initials: A
authors.lastname: Thompson