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 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. We have metallated these ligand precursors to form copper(I) and (II) complexes (figure 1, 1-3 a-c). The complexes have already been synthesized and thoroughly characterized. The geometry of some copper(I) complexes allows for studies on the oxygen transfer activity. We have conducted anion exchange on some of the copper(I) complexes to replace the [CuCl<sub>4</sub>]<sup>2-</sup> for another non-coordinating anion. The copper complexes will be tested for reactivity toward hydrogen peroxide and other O-atom donors. A detailed description of the syntheses, characterization (X-ray diffraction, electrochemistry, UV-Vis), and reactivity of the SNS copper complexes toward an oxygen atom donor will be presented.

Syntheses, characterization, and oxygen reactivity of three coordinate SNS pincer copper(I) pincer complexes

253rd National Meeting (2017)

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