Abstract
[EAPy][PF6] Pyridinium ionic liquid was synthesized by two-step process: introduction of one ethyl acetate group and anions metathesis. Additionally, single crystals of the IL was first obtained by solvent-evaporation method in growth systems. [EAPy][PF6] crystallizes in the monoclinic space group C2/c, with unit cell parameters a =22.748 Å, b =6.204 Å, c =18.552 Å, β =92.66°, z =8,V=2615(3) Å, Dc =1.58 Mg/m3 and F(000)=1264. In its supramolecular structure, the double zigzag chains are formed by hydrogen bonds and these [P(1)F6]- and [P(2)F6]- anions are sandwiched respectively by pyridinium rings and ethyl acetate groups in the packing pattern. Moreover, [EAPy][PF6] exhibits relatively high thermal stability and obvious supercooling during the cooling process, which makes pyridinium IL difficult to crystallize.
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