Crystal Structure and Thermal Property of 1-Ethyl Acetate Pyridinium Ionic Liquid

Ya Mei Zhao; Yan Su; Hong Meng Cui; Chang Zheng Zheng; Jing Yang

doi:10.4028/www.scientific.net/KEM.717.73

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Crystal Structure and Thermal Property of 1-Ethyl Acetate Pyridinium Ionic Liquid

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.