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 recently prepared copper(I) and copper(II) complexes that contain these ligand precursors. The copper(I) complexes were fluxional molecules. The copper(I) complexes participate as electrocatalysts for the reduction of carbon dioxide. A detailed description of the syntheses, and characterization (NMR Spectroscopy, ESI-Mass Spectrometry, and single crystal structures) of the SNS copper(I) and copper(II) complexes will be presented. The electrocatalytic activity of the copper(I) complexes for the reduction of carbon dioxide will also be presented.

Copper(I) SNS pincer complexes based on bis-imidazole and bis-triazole moieties as electrocatalyst precursors for solar fuel production

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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