Abstract
N-Vinyl-3-alkylimidazolium tetrahalogenidoferrate(III) ([VRIM][FeX4], X4 = Cl3Br, Cl4) and N-vinyl-3-esterimidazolium tetrachloroferrate(III)([VEIM][FeCl4]) magnetic ionic liquids were synthesized. They were characterized by 1H NMR, Raman, electrospray ionization mass spectrometry, differential scanning calorimetry and thermogravimetric analysis. Through Gaussian09/B3LYP/LANL2DZ density functional theory, the interaction energies of ion pairs and dipole moment of [VRIM][FeX4] and [VEIM][FeCl4] were obtained. The relationships between the surface tensions and temperature, molecular structure, and interaction energies of ion pairs along with the relationships between the solubility and molecular structure, common solvents, and interaction energies of ion pairs were discussed systematically. The relationship between the surface tensions and solubility parameter for [VRIM][FeX4] was expressed by using a Hildebrand–Scoff equation. And the hydrophilic–lipophilic balance (HLB) values of [VRIM][FeX4] were obtaine...
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