Crystal structures, thermal analysis and electrochemical behaviors of functionalized pyridinium ionic liquids comprising one 1-ethyl acetate group

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• 作者：Yamei Zhao ; Hongmeng Cui ; Changzheng Zheng…
• 关键词：Pyridinium ionic liquid ; Crystal structure ; Thermal analysis ; Electrochemical property
• 刊名：Chemical Research in Chinese Universities
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：32
• 期：1
• 页码：112-117
• 全文大小：475 KB
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• 作者单位：Yamei Zhao (1)
  Hongmeng Cui (1)
  Changzheng Zheng (1)
  Xiaogang Chen (1) (2)
  Chunyang Li (1)
  
  1. Department of Chemical Engineering, School of Environment and Chemical Engineering, Xi’an Polytechnic University, Xi’an, 710048, P. R. China
  2. School of Materials, the University of Manchester, Manchester, M13 9PL, UK
  
• 刊物主题：Chemistry/Food Science, general; Analytical Chemistry; Inorganic Chemistry; Organic Chemistry; Physical Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：2210-3171

文摘

Pyridinium ionic liquids(ILs, 1-ethyl acetate pyridinium hexfluorophosphate[EAPy][PF6] and 1-ethyl acetate-3-methyl pyridinium hexfluorophosphate[EAMPy][PF6]), were synthesized by a two-step process involving introduction of one ethyl acetate group and anion metathesis. Colorless single crystals of the two ILs were initially obtained using the solvent-evaporation method in mixed solvents. Single-crystal X-ray diffraction was used to determine the crystal structures. [EAPy][PF₆] crystallize in the monoclinic space group C2/c with a=2.2748(16) nm, b=0.6204(4) nm, c=1.8552(12) nm and Z=8, whereas [EAMPy][PF₆] crystallizes in the orthorhombic space group P2₁2₁2₁ with a=0.7126(17) nm, b=1.2792(3) nm, c=1.5327(3) nm and Z=4. The structure of [EAPy][PF₆] contains double zigzag chains formed by alternately pairing large organic cations with the octahedral anions of [P1F6]–or [P2F₆]–. The [P1F₆]– and [P2F₆]– anions occupy respectively two distinct crystallographic sites in crystal packing models. The structure of [EAMPy][PF₆] includes ladder-type chains constructed through pairing pyridinium cations with inorganic anions of [PF₆]–. The [PF₆]– anion in [EAMPy][PF₆] shows a distorted octahedron structure and is sandwiched by ethyl acetate groups in crystallographic stacking. This study reveals the influence of chemical modification involving the methyl group(CH₃) onto crystallographic structure of pyridinium ILs. Thermal analysis indicates that the difficult crystallization of the two ILs is related to the low void filling of ion pairs in crystal structure, leading to relatively low melting point and evident supercooling during the cooling process. Additionally, the experimental results indicate that the two ILs have electrochemical activity. The ethyl acetate group also allows downward shifting of electrochemical windows to less negative positions and the ionic conductivities of the two ILs follow an Arrhenius-type behavior. Keywords Pyridinium ionic liquid Crystal structure Thermal analysis Electrochemical property