Abstract
To further develop the diiron subsite biomimics of [FeFe]-hydrogenases, two new diiron azadithiolate (adt) complexes Fe2(μ-adtNPh)(CO)5(Ph2PX) (X = NHBut, 1 and P(O)Ph2, 2) featuring monodentate phosphines were unexpectedly produced by the Me3NO-induced decarbonylating reactions of all-CO diiron precursor Fe2(μ-adtNPh)(CO)6 (A, adtNPh = (SCH2)2NPh) with different aminodiphosphines (Ph2P)2NR (R = But and C6H4Cl-p) in MeCN at ambient temperature. The as-obtained complexes 1 and 2 have been fully characterized by means of elemental analysis, FT-IR, (1H, 31P) NMR spectroscopies and further confirmed by X-ray crystallography. At the same time, the electrochemical and electrocatalytic behaviors of 1 and 2 have been studied and compared in the absence or presence of acetic acid (HOAc) as a proton source by cyclic voltammetry (CV), suggesting that they can be considered as the active biomimetic electrocatalysts for proton reduction to hydrogen (H2).
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Acknowledgements
We are grateful to Research Project supported by Shanxi Scholarship Council of China (No. 2021-119) and Zhejiang Provincial Natural Science Foundation of China (No. LY19B020002) for the financial support of this work.
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Chen, FY., Hu, MY., Gu, XL. et al. ADT-Type [FeFe]-hydrogenase biomimics featuring monodentate phosphines: formation, structures, and electrocatalysis. Transit Met Chem 46, 645–653 (2021). https://doi.org/10.1007/s11243-021-00482-4
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DOI: https://doi.org/10.1007/s11243-021-00482-4