Synthesis, Characterization, and HER Activity of Pendant Diamine Derivatives of NiATSM
Journal Article
·
· European Journal of Inorganic Chemistry
- Univ. of Louisville, KY (United States); DOE/OSTI
- Univ. of Louisville, KY (United States)
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; 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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