Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligands

Tom Vander Hoogerstraete, Neil R. Brooks, Bernadette Norberg, Johan Wouters, Kristof Van Hecke, Luc Van Meervelt, Koen Binnemans

Research output: Contribution to journalArticle

Abstract

A series of ionic liquids with copper(ii), nickel(ii) or cobalt(ii)-containing cations have been synthesised and characterised, where possible with single crystal X-ray diffraction. A number of N-methylimidazole (MeIm), N-ethylimidazole (EtIm), N-butylimidazole (BuIm) or N-hexylimidazole (HeIm) ligands are coordinated to the metal centres and bis(trifluoromethyl) sulfonyl imide (Tf 2N) anions provide the charge balance. Two types of metal complexes have been analysed. One has the general formula [Cu(AlkIm) 4][Tf 2N] 2 (AlkIm = MeIm, EtIm, BuIm and HeIm) and contains square planar copper(ii) centres with longer interactions to oxygen atoms of bis(trifluoromethylsulfonyl)imide anions. The other type of metal complex has a metal:ligand ratio of 1:6, with composition [M(MeIm) 6][Tf 2N] 2 (M = Cu, Ni, Co) and contains octahedral metal centres. The ionic liquids have low melting points and the change in melting points is discussed as a function of alkyl chain length on the imidazole ligand and as a function of the metal centre. The metal-ligand interactions and intermolecular interactions in the crystal structures are analysed and related to the properties of the metal complexes.

Original languageEnglish
Pages (from-to)4902-4911
Number of pages10
JournalCrystEngComm
Volume14
Issue number15
DOIs
Publication statusPublished - 7 Aug 2012

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Coordination Complexes
Metal complexes
Transition metals
Melting
Crystal structure
Metals
transition metals
Ligands
melting
ligands
crystal structure
Imides
Ionic Liquids
metals
Ionic liquids
Anions
Melting point
Copper
Negative ions
imides

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Vander Hoogerstraete, T., Brooks, N. R., Norberg, B., Wouters, J., Van Hecke, K., Van Meervelt, L., & Binnemans, K. (2012). Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligands. CrystEngComm, 14(15), 4902-4911. https://doi.org/10.1039/c2ce25470k
Vander Hoogerstraete, Tom ; Brooks, Neil R. ; Norberg, Bernadette ; Wouters, Johan ; Van Hecke, Kristof ; Van Meervelt, Luc ; Binnemans, Koen. / Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligands. In: CrystEngComm. 2012 ; Vol. 14, No. 15. pp. 4902-4911.
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Vander Hoogerstraete, T, Brooks, NR, Norberg, B, Wouters, J, Van Hecke, K, Van Meervelt, L & Binnemans, K 2012, 'Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligands', CrystEngComm, vol. 14, no. 15, pp. 4902-4911. https://doi.org/10.1039/c2ce25470k

Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligands. / Vander Hoogerstraete, Tom; Brooks, Neil R.; Norberg, Bernadette; Wouters, Johan; Van Hecke, Kristof; Van Meervelt, Luc; Binnemans, Koen.

In: CrystEngComm, Vol. 14, No. 15, 07.08.2012, p. 4902-4911.

Research output: Contribution to journalArticle

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T1 - Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligands

AU - Vander Hoogerstraete, Tom

AU - Brooks, Neil R.

AU - Norberg, Bernadette

AU - Wouters, Johan

AU - Van Hecke, Kristof

AU - Van Meervelt, Luc

AU - Binnemans, Koen

PY - 2012/8/7

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AB - A series of ionic liquids with copper(ii), nickel(ii) or cobalt(ii)-containing cations have been synthesised and characterised, where possible with single crystal X-ray diffraction. A number of N-methylimidazole (MeIm), N-ethylimidazole (EtIm), N-butylimidazole (BuIm) or N-hexylimidazole (HeIm) ligands are coordinated to the metal centres and bis(trifluoromethyl) sulfonyl imide (Tf 2N) anions provide the charge balance. Two types of metal complexes have been analysed. One has the general formula [Cu(AlkIm) 4][Tf 2N] 2 (AlkIm = MeIm, EtIm, BuIm and HeIm) and contains square planar copper(ii) centres with longer interactions to oxygen atoms of bis(trifluoromethylsulfonyl)imide anions. The other type of metal complex has a metal:ligand ratio of 1:6, with composition [M(MeIm) 6][Tf 2N] 2 (M = Cu, Ni, Co) and contains octahedral metal centres. The ionic liquids have low melting points and the change in melting points is discussed as a function of alkyl chain length on the imidazole ligand and as a function of the metal centre. The metal-ligand interactions and intermolecular interactions in the crystal structures are analysed and related to the properties of the metal complexes.

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