新型环状锍基离子液体：合成、表征及物理化学性质

Novel cyclic sulfonium-based ionic liquids: synthesis, characterization, and physicochemical properties.

作者信息

Zhang Qinghua, Liu Shimin, Li Zuopeng, Li Jian, Chen Zhengjian, Wang Ruifeng, Lu Liujin, Deng Youquan

机构信息

Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.

出版信息

Chemistry. 2009;15(3):765-78. doi: 10.1002/chem.200800610.

DOI:10.1002/chem.200800610

PMID:19040247

Abstract

A new series of ionic liquids composed of three cyclic sulfonium cations and four anions has been synthesized and characterized. Their physicochemical properties, including their spectroscopic characteristics, ion cluster behavior, surface properties, phase transitions, thermal stability, density, viscosity, refractive index, tribological properties, ion conductivity, and electrochemical window have been comprehensively studied. Eight of these salts are liquids at room temperature, at which some salts based on NO(3) and NTf(2) ions exhibit organic plastic crystal behaviors, and all the saccharin-based salts display relatively high refractive indices (1.442-1.594). In addition, some ionic liquids with the NTf(2) ion exhibit peculiar spectroscopic characteristics in FTIR and UV/Vis regions, whilst those salts based on the DCA ion show lower viscosities (34.2-62.6 mPa s at 20 degrees C) and much higher conductivities (7.6-17.6 mS cm(-1) at 20 degrees C) than most traditional 1,3-dialkylimidazolium salts.

摘要

已合成并表征了一系列由三种环状锍阳离子和四种阴离子组成的新型离子液体。对它们的物理化学性质进行了全面研究，包括光谱特征、离子簇行为、表面性质、相变、热稳定性、密度、粘度、折射率、摩擦学性质、离子电导率和电化学窗口。其中八种盐在室温下为液体，一些基于[NO(3)]⁻和[NTf(2)]⁻离子的盐表现出有机塑性晶体行为，所有基于糖精的盐都显示出相对较高的折射率（1.442 - 1.594）。此外，一些含有[NTf(2)]⁻离子的离子液体在傅里叶变换红外光谱（FTIR）和紫外/可见光谱（UV/Vis）区域表现出独特的光谱特征，而那些基于[DCA]⁻离子的盐比大多数传统的1,3 - 二烷基咪唑鎓盐具有更低的粘度（20℃时为34.2 - 62.6 mPa·s）和更高的电导率（20℃时为7.6 - 17.6 mS·cm⁻¹）。