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. The analogous copper(I) complexes participate as electrocatalysts for the reduction of carbon dioxide and the reduction of hydrogen cations. We have recently prepared cobalt(II) complexes that contain these ligand precursors. A detailed description of the syntheses, and characterization (ESI-Mass Spectrometry, UV-Visible Spectroscopy, EPR Spectroscopy, and single crystal structures) of the SNS cobalt(II) complex will be presented. The electrocatalytic activity of the cobalt(II) complex for the reduction of hydrogen cations will also be presented.

Cobalt(II) SNS pincer complex based on a bis-imidazole moiety as an electrocatalyst precursor for the reduction of hydrogen cations

ACS Spring Meeting 2021

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