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The aim of this study is to investigate the possible use of a 1,2-dimethylimidazolium ionic liquid, 2,2-bis((1,2-dimethylimidazolium)methyl)propane-1,3-diol hexafluorophosphate (1), as an adsorbent to selectively remove aromatic heterocyclic sulfur compounds from model fuels. The result indicates that adsorbent 1 is insoluble in model fuels. The spent IL saturated sulfur compounds could be regenerated by a water dilution process. The influence of extraction time or temperature as well as the molar ratio of 1 to aromatic heterocyclic sulfur compound was also studied.

Condensation of aromatic aldehydes with cyclopentanone and cyclohexanone using amino-functionalized ionic liquid, 1-aminoethyl-3-methyl tetrafluoroborate as solvent and catalyst was successfully performed for preparation of α,α′-bis(substituted benzylidene)cycloalkanones. The catalyst can be recovered and reused for at least three times without apparently lose of activity. The process is simple, environmentally benign and proceeds in excellent yields.

New functionalized ionic liquids, 1-carboxylmethyl-3-methylimimidazolium hexafluorophosphate or fluoborate and 1-aminoethyl-3-methylimimidazolium hexafluorophosphate or fluoborate have been synthesized and investigated. The obtained amino or carboxyl-functionalized ionic liquids were all characterized by FT-IR, 1 H NMR and MS (ESI) and their properties such as freezing point, viscosity, solubility, specific gravity, surface tension, and interfacial tension were also determined.

In the title compound, C13H10ClN3, the benzimidazole and chloropyridyl groups are planar and make a dihedral angle of 68.01 (18)°. There are two weak C—H⋯N hydrogen bonds, producing sheets parallel to (100).