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Synthesis, Characterization, and HER Activity of Pendant Diamine Derivatives of NiATSM

Journal Article · · European Journal of Inorganic Chemistry

A pair of bis-thiosemicarbazonato-Ni(II) complexes with pendant polyamines, (N,N'-(dimethylethylenediaminothiosemi-carbazonato)-4-(methylthiosemi-carbazonato)butane-2,3-diimine)-nickel(II) (1) and (N,N'-bis(dimethylethyl-enediaminothiosemi-carbazonato)butane-2,3-diimine)-nickel(II) (3), have been synthesized. Methylation at the terminal amines yields the cationic derivatives 2 and 4. All complexes are fully characterized by spectroscopic, electrochemical, and single-crystal X-ray diffraction methods. Single crystal X-ray diffraction studies on all four Ni(II) complexes confirm a square planar Ni(II) framework with no significant changes in the coordination environment as a function of the pendant groups. Spectroscopic studies are consistent with a similar electronic structure in all complexes. However, electrochemical investigations reveal significant cathodic shifts in the Ni(II)L/Ni(II)L·– and Ni(II)L·–/Ni(I)L·2– reduction potentials of the methylated vs. non-methylated species. The HER activity of all four nickel complexes were evaluated in acetonitrile with glacial acetic acid. The 3 complex was shown to have the highest activity with a TOF of 6.3 × 103 s-1, an overpotential of 0.56 V, and faradaic efficiency of 100%.

Research Organization:
University of Louisville, KY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-08CH11538
OSTI ID:
1609952
Alternate ID(s):
OSTI ID: 1558811
Journal Information:
European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry Journal Issue: 33 Vol. 2019; ISSN 1434-1948
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Ligand-based electronic effects on the electrocatalytic hydrogen production by thiosemicarbazone nickel complexes journal January 2020
Recent advances in the mechanisms of the hydrogen evolution reaction by non-innocent sulfur-coordinating metal complexes journal January 2020


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