title: Transition metal chlorides are Lewis acids toward terminal chloride attached to late transition metals.
abstract: Two different neutral tridentate imine-donor pincer ligands interact with excess MCl2 (M = Co or Cu) to form compounds of the same stoichiometry, (LMCl2)2·MCl2, where the assembling force is the electron richness of the terminal chlorides on the LMCl2 unit. Finite aggregation occurs for M = Co, but for M = Cu, an infinite polymeric structure is adopted, all because MCl2 is bifunctional, which thus bridges multiple MCl units. The bis-pyrazolylpyridine ligand has two acidic NH protons, and both of these are involved in intramolecular hydrogen bonds. The generality of this Lewis acid aggregation is discussed.
authors.affiliation: Department of Chemistry, Indiana University , 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States.
authors.forename: Alice K
authors.initials: AK
authors.lastname: Hui
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Cook
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Mindiola
authors.forename: Kenneth G
authors.initials: KG
authors.lastname: Caulton