Title: Liquid nickel salts: Synthesis, crystal structure determination and electrochemical synthesis of nickel nanoparticles
Authors: Sniekers, Jeroen
Verguts, Ken
Brooks, Neil
Schaltin, Stijn
Phan, Thanh Hai
Huynh, Thi Mien Trung
Van Meervelt, Luc
De Feyter, Steven
Seo, Jin Won
Fransaer, Jan
Binnemans, Koen # ×
Issue Date: 2016
Publisher: VCH Verlagsgesellschaft
Series Title: Chemistry - a European Journal vol:22 issue:3 pages:1010-1020
Abstract: New nickel-containing ionic liquids were synthesized, characterized and their electrochemistry was investigated. In addition, a mechanism for the electrochemical synthesis of nanoparticles from these compounds is proposed. In these so-called liquid metal salts, the nickel(II) cation is octahedrally coordinated by six N-alkylimidazole ligands. The different counter anions that were used are
bis(trifluoromethanesulfonyl)imide (Tf2N-), trifluoromethanesulfonate (OTf-) and methanesulfonate (OMs-). Several different N-alkylimidazoles were considered, with the alkyl sidechain ranging in length from methyl to dodecyl. The newly synthesized liquid metal salts were characterized by CHN analysis, FTIR, DSC, TGA and viscosity measurements. An odd-even effect was observed for the melting temperatures and viscosities of the ionic liquids, with the complexes with an even number of carbon atoms in the alkyl chain of the imidazole having a higher melting temperature and a lower viscosity than the complexes with an odd number of carbons. The crystal structures of several of the nickel(II) complexes that are not liquid at room temperature were determined. The electrochemistry of the compounds with the lowest viscosities was investigated. The nickel(II) cation could be reduced but surprisingly no nickel deposits were obtained on the electrode. Instead, nickel nanoparticles
were formed at 100% selectivity, as confirmed by TEM. The magnetic properties of these nanoparticles were investigated by SQUID measurements.
ISSN: 0947-6539
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Surface and Interface Engineered Materials
Molecular Design and Synthesis
Molecular Imaging and Photonics
Biochemistry, Molecular and Structural Biology Section
× corresponding author
# (joint) last author

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