title: Linkage isomerism in transition-metal complexes of mixed (arylcarboxamido)(arylimino)pyridine ligands.
abstract: The synthesis of a series of asymmetric mixed 2,6-disubstituted (arylcarboxamido)(arylimino)pyridine ligands and their coordination chemistry toward a series of divalent first-row transition metals (Cu, Co, and Zn) have been explored. Complexes featuring both anionic N,N',N″-carboxamido and neutral O,N,N'-carboxamide coordination have been prepared and characterized by X-ray crystallography, cyclic voltammetry, and UV-visible and EPR spectroscopy. Specifically, (R)LM(X) (M = Cu; X = Cl(-), OAc(-)) and (R)L(H)MX2 (M = Cu, Co, Zn; X = Cl(-), SbF6(-)) complexes that feature N,N',N″- or O,N,N'-coordination are presented. Base-induced linkage isomerization from O,N,N'-carboxamide to N,N',N″-carboxamido coordination is also confirmed by multiple forms of spectroscopy.
authors.affiliation: Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.
authors.forename: David W
authors.initials: DW
authors.lastname: Boyce
authors.forename: Debra J
authors.initials: DJ
authors.lastname: Salmon
authors.forename: William B
authors.initials: WB
authors.lastname: Tolman
mesh_terms: D008670:Metals / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry*; D028561:Transition Elements
chemical_list: D008670:Metals; D011725:Pyridines; D028561:Transition Elements