Crystal structure and electrocatalytic investigation of diiron azadiphosphine complex [Fe<sub>2</sub>(<i>μ</i>-pdt)(CO)<sub>4</sub>{(<i>μ</i>-Ph<sub>2</sub>P)<sub>2</sub>NH}] related to [FeFe]-hydrogenases
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The solid-state structure of diiron azadiphosphine complex [Fe<sub>2</sub>(<i>μ</i>-pdt)(CO)<sub>4</sub>{(<i>μ</i>-Ph<sub>2</sub>P)<sub>2</sub>NH}] (<b>1</b>) bearing a pendant amine, which can be regarded as the diiron subsite model of [FeFe]-hydrogenases, have been well investigated by X-ray crystallography. Notably, in order to explore the potential role of a pendant amine in the bridging azadiphosphine ligand, the electrochemical and electrocatalytic properties of <b>1</b> and its reference analog [Fe<sub>2</sub>(<i>μ</i>-pdt)(CO)<sub>4</sub>{(<i>μ</i>-Ph<sub>2</sub>P)<sub>2</sub>CH<sub>2</sub>}] (<b>2</b>) have been studied and compared in the absence and presence of acetic acid (HOAc) as a proton source using cyclic voltammetry (CV), indicating that they are active for the electrocatalytic proton reduction to hydrogen (H<sub>2</sub>).
