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Title: Homoleptic and heteroleptic N-alkylimidazole zinc(II)-containing ionic liquids for high current density electrodeposition
Authors: Steichen, Marc
Brooks, Neil R.
Van Meervelt, Luc
Fransaer, Jan
Binnemans, Koen # ×
Issue Date: 2014
Publisher: Royal Society of Chemistry
Series Title: Dalton Transactions vol:43 issue:32 pages:12329-12341
Abstract: New homoleptic and heteroleptic zinc(II)-containing liquid metal salts with N-alkylimidazole (AlkIm) ligands and bis(trifluoromethylsulfonyl)imide (Tf2N−) anions are described. The general formulae of the complexes are [Zn(AlkIm)6][Tf2N]2 and [Zn(AlkIm)6−x(AlkIm′)x][Tf2N]2. Single-crystal X-ray diffraction revealed that, in the solid state, the cations consist of octahedral zinc(II) centres. The heteroleptic complexes contain two different N-alkylimidazole ligands. The melting points of the liquid metal salts are below or slightly above room temperature. The dependence of the melting points, viscosity and crystal structure on the alkyl chain length of the N-alkylimidazole ligand for the homoleptic complexes and on the ratio of the two N-alkylimidazole ligands AlkIm and AlkIm′ for the heteroleptic compounds is discussed. The possibility of incongruent melting and the presence of a mixture of the four-coordinate zinc(II) centre and neutral ligands is discussed. The new zinc(II)-containing liquid metal salts have been used as non-aqueous electrolytes for electrodeposition of zinc. A highly reversible deposition–stripping behaviour was found. Zinc electroplating was possible at very high current densities of more than −200 mA cm−2 in unstirred solutions. Compact and highly crystalline zinc deposits were obtained.
ISSN: 1477-9226
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Biochemistry, Molecular and Structural Biology Section
Surface and Interface Engineered Materials
× corresponding author
# (joint) last author

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