Here we describe the synthesis, characterization, and electrochemistry of Ni complexes containing redox non-innocent S2N2 and N4 ligands, and their electrochemical reactivity with CO2. Both tetradentate ligands contain an o-phenylenediamine subunit that is capable of undergoing two successive one-electron oxidations. The Ni complexes were prepared to compare how different flanking substituents (SMe vs NMe2) affect stepwise oxidation of the complexes and their electrochemical reactivity towards CO2. Cyclic voltammetry was used to quantify reduction potentials and the compounds were chemically oxidized for structure and spectroscopic analysis. Nickel complexes with redox-inactive tetradentate ligand derivatives were also prepared to evaluate the relative importance of the redox active o-phenylenediamine unit in CO2 reduction chemistry. Supporting single crystal X-ray diffraction (XRD) and spectroscopic data (NMR, IR, and EPR) will be reported.

Ni complexes with redox-active tetradentate ligands: Structures, electrochemistry, and reactivity studies with CO2

255th National Meeting (2018)

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