title: Macrocyclic Binucleating β-Diketiminate Ligands and their Lithium, Aluminum, and Zinc Complexes.
abstract: The incorporation of rigid aromatic linkers into β-diketiminate ligands creates a binucleating scaffold that holds two metals near each other. This paper discloses the synthesis, characterization, and reactivity of mBin(2-), which has a meta-substituted xylylene spacer, and pBin(2-), which has a para-substituted xylylene spacer. Lithium, aluminum, and zinc complexes of each ligand are isolated, and in some cases are characterized by X-ray crystallography. The lithium complexes are coordinated to solvent-derived THF ligands, while the zinc and aluminum complexes have alkyl ligands. Complexes of the mBin(2-) ligand have an anti conformation in which the metals are on opposite sides of the macrocycle, while pBin(2-) complexes prefer a syn conformation. The (1)H NMR spectra of the complexes demonstrate that the conformations rapidly interconvert in the lithium complexes, and less rapidly in the zinc and aluminum complexes.
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, NY, 14627.
authors.forename: Javier
authors.initials: J
authors.lastname: Vela
authors.forename: Liwei
authors.initials: L
authors.lastname: Zhu
authors.forename: Christine J
authors.initials: CJ
authors.lastname: Flaschenriem
authors.forename: William W
authors.initials: WW
authors.lastname: Brennessel
authors.forename: Rene J
authors.initials: RJ
authors.lastname: Lachicotte
authors.forename: Patrick L
authors.initials: PL
authors.lastname: Holland