Recently, we have developed and synthesized a series of tridentate pincer ligands, each possessing two sulfur- and one nitrogen-donor functionalities (SNS), based on bis-imidazole or bis-triazole precursors. The tridentate SNS ligands incorporate thione-substituted imidazole or triazole functionalities. We have prepared somewhat rigid ligand systems (<b>1a-c</b>) through the use of 2,6-dibromopyridine as a ligand precursor. In addition, we have prepared more flexible ligand systems by employing the starting material 2,6-(dibromomethyl)pyridine to introduce a methylene linker into the pincer ligand (<b>2a-c, 3a-c</b>). We have metallated these ligand precursors to form zinc(II) complexes containing these tridentate ligands. We have prepared cobalt(II) complexes that contain these ligand precursors. The cobalt(II) complexes are cobalt model complexes for liver alcohol dehydrogenase. Gaussian calculations are used to understand some of the experimental results. A detailed description of the syntheses, and characterization (NMR Spectroscopy, ESI-Mass Spectrometry, electrochemistry, UV-Visible, EPR spectroscopy, and single crystal structures) of the SNS cobalt(II) complexes and ligand precursors will be presented. Reactivity findings will also be presented for the reduction of aldehydes in the presence of a hydrogen donor.

Syntheses, characterization, and reactivity of cobalt(II) SNS pincer complexes

2019 Fall National Meeting

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