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Intramolecular Hydrogen Bonding In CuIi Complexes With 2,6-Pyridinedicarboxamide Ligands: Synthesis, Structural Characterization, And Physical Properties, Denan Wang, Sergey V. Lindeman, Adam T. Fiedler

Chemistry Faculty Research and Publications

The significance of second-sphere interactions in synthetic catalysts and metalloenzyme active sites has encouraged the development of ligand frameworks capable of supporting intramolecular hydrogen-bonding networks. With this approach in mind, we prepared a series of 2,6-pyridinedicarboxamide ligands (H₂L^X) that feature outer-sphere heterocyclic groups (pyridine, pyrimidine, or quinoline rings). Reaction with CuCl₂ yields complexes with the general formula [CuCl₂(L^X{H}₂)] (1^X), in which the pincer ligands coordinate to the Cu^II center in a tridentate fashion through the central pyridine and two amidato nitrogen atoms. The L^{X …}