23251-72-1Relevant articles and documents
Preparation of protic ionic liquids with minimal water content and 15N NMR study of proton transfer
Burrell, Geoffrey L.,Burgar, Iko M.,Separovic, Frances,Dunlop, Noel F.
, p. 1571 - 1577 (2010)
Low-molecular-weight Bronsted acids and amine bases were used to reproducibly prepare very dry, high-purity room-temperature protic ionic liquids (PILs). A series of eight amine bases and six Bronsted acids were combined to produce 48 mixtures, of which 18 were liquid at room temperature. The phase transitions and thermal decomposition temperatures were determined for each mixture; whereas viscosity, density and conductivity were determined for the room-temperature liquids. By utilising 15N NMR it was possible to distinguish between neutral and ionised amine bases (ammonia vs. ammonium-type ion), which indicated that the protic ionic liquids were completely ionised when made as a stoichiometric mixture. However, a Walden plot comparison of fluidity and molar conductivity indicated the majority of PILs had much lower conductivity than predicted by viscosity unless the base contained excess proton-donating groups. This disparity is indicative of protic ionic molecules forming neutral aggregates or non-Newtonian fluid hydrogen-bonded networks with a secondary Grotthuss proton-hopping mechanism arising from polyprotic bases. the Owner Societies 2010.
Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties
Buarque, Filipe S.,Camêlo, Lídia C. A.,Soares, Cleide M. F.,Mattedi, Silvana,Ferreira, Ailton F. B.,Feitosa, Filipe X.,Souza, Ranyere L.,de Sant’Ana, Hosiberto B.,Lima, álvaro S.
, p. 4309 - 4325 (2021/11/18)
This work presents density (ρ), dynamic viscosity (η), refractive index (nD), and surface tension (γ) experimental data for three pure protic ionic liquids: 2-hydroxyethylammonium acetate ([2-HEA][Ac]), bis(2-hydroxyethyl)ammonium acetate ([BHEA][Ac]), and bis(2 hydroxyethyl)ammonium butyric ([BHEA][Bu]), along with experimental data for two binary systems, as follows: ([2-HEA][Ac] + [BHEA][Ac]) and ([2-HEA][Ac] + [BHEA][Bu]), at a temperature range ofT= 278.15 to 343.15 K and atmospheric pressure (101.3 kPa). For the ([2-HEA][Ac] + [BHEA][Ac]) binary system, excess volume and refractive index deviation values are negative, while for the ([2-HEA][Ac] + [BHEA][Bu]) binary system are positive. For the first, there is a volume contraction, with higher probability of ion interactions. For the latter system, an expansive trend and lower ion interactions were found when compared to the ([2-HEA][Ac] + [BHEA][Ac]) system. Viscosity deviations values show a negative behavior for both binary systems studied. These results could indicate the predominance of dispersive forces. Furthermore, for the [2-HEA][Ac] + [BHEA][Ac] system, surface tension deviation values are positive. On the other hand, for the [2-HEA][Ac] + [BHEA][Bu] system this derivative property are negative. From these results, the [2-HEA][Ac] + [BHEA][Ac] binary system could be characterized by presenting prevalent dispersion forces and an unequal distribution of the mixture components between the bulk and interface.
The hydrophilic ionic liquid at room temperature and its use
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Paragraph 0105; 0106, (2019/09/11)
PROBLEM TO BE SOLVED: To provide a novel ionic liquid that is liquid at a room temperature and is hydrophilic, particularly water-soluble, and use thereof.SOLUTION: This invention provides a hydrophilic room-temperature ionic liquid including a cation and an anion, the cation being a quaternary ammonium cation of the formula (I), and the anion being a carboxylate anion, where R represents a 1-5C straight-chain or branched-chain alkylene group, and n represents an integer of 1-3.
