Aluminium speciation in 1-Butyl-1-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)amide/AlCl3 mixtures

Rocher, Nathalie M., Izgorodina, Ekaterina I., Rüther, Thomas, Forsyth, Maria, MacFarlane, Douglas R., Rodopoulos, Theo, Horne, Michael D. and Bond, Alan M. 2008, Aluminium speciation in 1-Butyl-1-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)amide/AlCl3 mixtures, Chemistry - a European journal, vol. 15, no. 14, pp. 3435-3447, doi: 10.1002/chem.200801641.

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Title Aluminium speciation in 1-Butyl-1-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)amide/AlCl3 mixtures
Author(s) Rocher, Nathalie M.
Izgorodina, Ekaterina I.
Rüther, Thomas
Forsyth, MariaORCID iD for Forsyth, Maria
MacFarlane, Douglas R.
Rodopoulos, Theo
Horne, Michael D.
Bond, Alan M.
Journal name Chemistry - a European journal
Volume number 15
Issue number 14
Start page 3435
End page 3447
Total pages 13
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Place of publication Weinheim, Germany
Publication date 2008-03-23
ISSN 0947-6539
Keyword(s) ab initio calculations
ionic liquids
NMR spectroscopy
Raman spectroscopy
Summary Aluminium speciation: Aluminium speciation in NTf2 ionic liquids has a strong influence on its electrodeposition from the liquid mixture. This work probed the nature of these species and proposes that the electroactive species involved are either [AlCl3(NTf2)] or [AlCl2(NTf2)2] (e.g., see figure).

Electrodeposition of aluminium is possible from solutions of AlCl3 dissolved in the 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (C4mpyrNTf2) ionic liquid. However, electrodeposition is dependant on the AlCl3 concentration as it only occurs at concentrations >1.6 mol L−1. At these relatively high AlCl3 concentrations the C4mpyrNTf2/AlCl3 mixtures exhibit biphasic behaviour. Notably, at 1.6 mol L−1 AlCl3, aluminium can only be electrodeposited from the upper phase. Conversely, we found that at 3.3 mol L−1 aluminium electrodeposition can only occur from the lower phase. The complex chemistry of the C4mpyrNTf2/AlCl3 system is described and implications of aluminium speciation in several C4mpyrNTf2/AlCl3 mixtures, as deduced from Raman and 27Al NMR spectroscopic data, are discussed. The 27Al NMR spectra of the C4mpyrNTf2/AlCl3 mixtures revealed the presence of both tetrahedrally and octahedrally coordinated aluminium species. Raman spectroscopy revealed that the level of uncoordinated NTf2 anions decreased with increasing AlCl3 concentration. Quantum chemical calculations using density functional and ab initio theory were employed to identify plausible aluminium-containing species and to calculate their vibrational frequencies, which in turn assisted the assignment of the observed Raman bands. The data indicate that the electroactive species involved are likely to be either [AlCl3(NTf2)] or [AlCl2(NTf2)2].
Language eng
DOI 10.1002/chem.200801641
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Wiley-VCH Verlag GmbH&Co. KGaA
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