Mixtures of the 1-ethyl-3-methylimidazolium acetate ionic liquid with different inorganic salts: insights into their interactions

In this work, we explore the interactions between the ionic liquid 1-ethyl-3-methylimidazolim acetate and different inorganic salts belonging to two different cation families, those based on ammonium and others based on sodium. NMR and Raman spectroscopy are used to screen for changes in the molecul...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2016-01, Vol.18 (4), p.2756-2766
Main Authors: Oliveira, Filipe S, Cabrita, Eurico J, Todorovic, Smilja, Bernardes, Carlos E. S, Canongia Lopes, José N, Hodgson, Jennifer L, MacFarlane, Douglas R, Rebelo, Luís P. N, Marrucho, Isabel M
Format: Article
Language:English
Subjects:
Acetates
Aggregates
Cations
Inorganic salts
Ionic liquids
Mathematical analysis
Nuclear magnetic resonance
Sodium
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Summary:In this work, we explore the interactions between the ionic liquid 1-ethyl-3-methylimidazolim acetate and different inorganic salts belonging to two different cation families, those based on ammonium and others based on sodium. NMR and Raman spectroscopy are used to screen for changes in the molecular environment of the ions in the ionic liquid + inorganic salt mixtures as compared to pure ionic liquid. The ion self-diffusion coefficients are determined from NMR data, allowing the discussion of the ionicity values of the ionic liquid + inorganic salt mixtures calculated using different methods. Our data reveal that preferential interactions are established between the ionic liquid and ammonium-based salts, as opposed to sodium-based salts. Computational calculations show the formation of aggregates between the ionic liquid and the inorganic salt, which is consistent with the spectroscopic data, and indicate that the acetate anion of the ionic liquid establishes preferential interactions with the ammonium cation of the inorganic salts, leaving the imidazolium cation less engaged in the media. The interactions between the ionic liquid 1-ethyl-3-methylimidazolim acetate and [NH 4 ]-based inorganic salts is stronger than those between the IL and Na-based.
ISSN:1463-9076
1463-9084
DOI:10.1039/c5cp06937h