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Updated: Sep 20, 2025

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
Published on: February 19, 2018
Nickel complexes based on amidine for applications in gas-assisted methods and photocatalysis
A Butrymowicz-Kubiak1, A Topolski1, T M Muzioł1
1Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland. aleksandra.butrymowicz@doktorant.umk.pl.
None:
The new nickel(II) complexes were investigated as potential precursors for gas-assisted methods: chemical vapor deposition and focused electron or ion beam induced deposition, which are techniques to produce nanomaterials. We report the conventional and mechanochemical 'green' synthesis of amidine-carboxylate [Ni2(NH2(NH)CRf)2(μ-O2CRf)4] (Rf = CF3, C2F5) and imidoylamidinate [Ni(NHC(CF3)NC(CF3)NH)2] complexes with perfluorinated substituents and their characteristics. Infrared spectroscopy, electron impact mass spectrometry, and density-functional theory calculations were used to confirm the formation of dinuclear amidine-carboxylate and mononuclear imidoylamidinate complexes. Additionally, the structure of [Ni(NHC(CF3)NC(CF3)NH)2]·(NH4)(CF3CONH)·(CF3CONH2)·H2O was solved using single crystal X-ray diffraction. Thermal stability and volatility of the studied compounds were investigated using thermal analysis and sublimation experiments. These results show that [Ni2(NH2(NH)CC2F5)2(μ-O2CC2F5)4] and [Ni(NHC(CF3)NC(CF3)NH)2] sublimate over a range of 358-423 K under 10-2 mbar pressure. Electron impact mass spectrometry of complexes and microscopy studies (SEM/EDX and TEM/EDX) reveal that [Ni2(NH2(NH)CC2F5)2(μ-O2CC2F5)4] is the most sensitive to low- and high-energy electrons. For this compound, the nickel-based materials were grown on silicon, glass, and finally titania nanotubes using the chemical vapor deposition (CVD) process. Kinetic tests have shown that the modification of titania nanotubes with nickel strengthens this material's photocatalytic activity in methylene blue photodegradation. The obtained results indicate that the selected compound may be a promising precursor for vapor deposition techniques.
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