Two Novel Dinuclear Cobalt Polypyridyl Complexes in Electro- and Photocatalysis for Hydrogen Production: Cooperativity Increases Performance

Weder, Nicola; Grundmann, Nora S; Probst, Benjamin; Blacque, Olivier; Ketkaew, Rangsiman; Creazzo, Fabrizio; Luber, Sandra; Alberto, Roger

doi:10.1002/cssc.202201049

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Weder, N., Grundmann, N. S., Probst, B., Blacque, O., Ketkaew, R., Creazzo, F., Luber, S., & Alberto, R. (2022). Two Novel Dinuclear Cobalt Polypyridyl Complexes in Electro- and Photocatalysis for Hydrogen Production: Cooperativity Increases Performance. ChemSusChem, 15(17), e202201049. https://doi.org/10.1002/cssc.202201049

Abstract

Syntheses and mechanisms of two dinuclear Co-polypyridyl catalysts for the H2 evolution reaction (HER) were reported and compared to their mononuclear analogue (R1). In both catalysts, two di-(2,2’-bipyridin-6-yl)-methanone units were linked by either 2,2’-bipyridin-6,6’-yl or pyrazin-2,5-yl. Complexation with CoII gave dinuclear compounds bridged by pyrazine (C2) or bipyridine (C1). Photocatalytic HER gave turnover numbers (TONs) of up to 20000 (C2) and 7000 (C1) in water. Electrochemically, C1 was similar to the R1, whereas C2 showe