Abstract
AbstractTwo novel hydrophobic ionic liquids (IL) with partial substitution of chlorine and fluorine in the 1‐butyl‐3‐methylimidazolium cation (noted as [BMIM] or [C8H15N2] hereafter), viz. [C8H12.28Cl0.96F1.76N2]Cl and [C8H12.75Cl1.58F0.67N2][PF6], were reported, which were prepared from the precursors [BMIM]Cl and [BMIM][PF6], respectively through chlorination with chlorine gas and fluorination with potassium fluoride. The position of the chlorine substitution in the resulting IL was identified using proton nuclear magnetic resonance (1H NMR). The results showed that chlorination mainly took place in the imidazolium ring and partly in the methyl of butyl group. Moreover, the physico‐chemical properties of the resulting IL were measured experimentally including thermal stability, viscosity, and mutual solubility with water. It is showed that the hydrophobic property and viscosity of the IL [C8H12.28Cl0.96F1.76N2]Cl and [C8H12.75Cl1.58F0.67N2][PF6] increased greatly while the decomposition temperature decreased to some extent compared to their corresponding non‐modified IL [C8H15N2]Cl and [C8H15N2][PF6]. This study proposed an alternative and cost‐effective approach for tuning the hydrophobic property of IL.
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