Physicochemical characterization of paramagnetic ionic liquids 1‐vinyl‐3‐alkylimidazolium tetrahalogenidoferrate(III) [VRIM][FeCl_mBr_4 − m]

Abstract

Using microwave-assisted synthesis method, a series of paramagnetic ionic liquids comprising 1-vinyl-3-alkylimidazolium VRIM + cation and tetrahalogenidoferrate (III) FeCl m Br 4 À m À anion were designed and synthesized. The structure was analyzed using 1 H NMR and Raman spectroscopy. Ultraviolet-visible absorption spectra, thermal stability, magnetic susceptibility, viscosity, ionic conductivity, and solubility were characterized. Results show that elongation of the alkyl chain leads to replacement of bromides with a small amount of chlorides in the anion, shifting of UV maximum absorption peaks to shorter wavelengths, reduction of ionic conductivity, and solubility in polar solvents, as well as increase in fluidity, magnetic susceptibility, and solubility in nonpolar solvents.

Well‐Defined Magnetic Responsive Polymers Containing Ammonium FeCl4 from ROMP

“…As reported, most of the magnetic materials containing FeCl 4 − exhibit a paramagnetic temperature dependence of χ, with only small deviations from the Curie–Weiss law at low temperatures . Figure B shows the χ – T and 1/χ – T curves of poly(TAENDI‐FeCl 4 ) 50 under an applied magnetic field of 10 K Oe from 5 to 300 K. As expected, magnetic polymer with FeCl 4 − simply displays paramagnetic behavior over the temperature range studied.…”

Investigating the effect of ligand and cation on the properties of metal fluorinated acetylacetonate based magnetic ionic liquids

“…The solubility of MILs in various organic solvents is very important in order to exploit them in applications including photoluminescent materials, 43 liquid membranes, 27 reaction media in organic synthesis, 14,15 and catalysis. 10,11 The solubility of MILs in ten different organic solvents, with polarities ranging from 0.009 to 1.000 according to the Reichardt polarity index, 44 were studied to develop a fundamental understanding of their solubilities.…”

“…[4][5][6][7][8] These compounds possess many similar properties to traditional ILs, with the additional characteristic of responding to an external magnetic field. MILs have been successfully employed for density measurements via magnetic levitation, 9 catalysis, 10,11 magnetic fluids, 12 cellulose dissolution, 13 solvents in various organic reactions, 14,15 electrochromic applications, 16 and extraction of hazardous chemicals. 17 The physicochemical properties of MILs can be tailored for specific applications through careful modification of the cation and anion structures.…”

“…21 Magnetic susceptibilities as high as 11.6 m B have been reported using a tricationic MIL framework. 22 MILs have also drawn attention due to their low volatility, making them environmentally-friendly and suitable for high temperature applications such as solvents for organic synthesis, 14,15 and gas-liquid chromatography. 23,24 It has been observed that both the cation and anion components have a significant contribution towards the thermal stability of MILs.…”

Investigation of Surface Properties and Solubility of 1-Vinyl-3-alkyl/Esterimidazolium Halide Ionic Liquids by Density Functional Methods

“…On the basis of the pressure difference ΔP of liquids and constant k at fixed temperature, the surface tension of liquids at each given temperature point could be obtained through the abovementioned formula. 38 other ILs were synthesized. The mass fraction purity for the liquid ILs is >0.980, and for the solid ILs is >0.990.…”