Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 298, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2019.112077
Keywords
Ionic liquid; Dicationic; Thermal properties; Cation-anion interaction; Ibuprofen; Docusate; Ascorbic
Funding
- National Council of Scientific and Technological Development (Conselho Nacional de Desenvolvimento Cientiico e Tecnologico CNPq) [432201/2018-1, 306389/2018-5]
- Rio Grande do Sul State Foundation for Research Support (Fundacao de Amparo A Pesquisa do Estado do Rio Grande do Sul FAPERGS) [17/2551-0000944-4]
- CNPq
- CAPES
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The properties of an ionic liquid (IL) are directly related to the structure of its ions, which determine the nature of intermolecular cation-anion interactions. In this paper, we determined the thermal properties and cation-anion interaction strength of a series of dicationic imidazolium-based ILs containing alkyl spacer with eight methylene cation [BisOct(MIM)(2)] and organic larger anions (ibuprofenate, hippurate, ascorbate, N-triflate, and docusate). Results showed that thermal properties do not depend on the volume or molecular weight of the anion, but on its organic nature, which is, the more organic, the less stable. The cation-anion interaction strength was determined by electrospray ionization mass spectrometry using collision-induced experiments. Results showed that the larger the anion, the weaker the cation-anion interaction. This tendency can be understood considering that the higher the anion volume, the smaller the charge density and, therefore, the cation-anion interaction weakens. On the other hand, our results showed that cation-anion interaction strength is related to more negative sites of the anion surface electrostatic potential. The more negative the sites, the stronger the cation- anion interaction. (C) 2019 Elsevier B.V. All rights reserved.
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