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, RLM(X) (M = Cu; X = Cl–, OAc–) and RL(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.
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