Domańska Urszula, Bogel-Łukasik Rafał
Physical Chemistry Division, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
J Phys Chem B. 2005 Jun 23;109(24):12124-32. doi: 10.1021/jp058015c.
Quaternary ammonium salts, which are precursors of ionic liquids, have been prepared from N,N-dimethylethanolamine as a substrate. The paper includes specific basic characterization of synthesized compounds via the following procedures: nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectra, water content, mass spectroscopy (MS) spectra, temperatures of decompositions, basic thermodynamic properties of pure ionic liquids (the melting point, enthalpy of fusion, enthalpy of solid-solid phase transition, glass transition), and the difference in the solute heat capacity between the liquid and solid at the melting temperature determined by differential scanning calorimetry (DSC). The (solid + liquid) phase equilibria of binary mixtures containing (quaternary ammonium salt + water, or + 1-octanol) has been measured by a dynamic method over wide range of temperatures, from 230 K to 560 K. These data were correlated by means of the UNIQUAC ASM and modified nonrandom two-liquid NRTL1 equations utilizing parameters derived from the (solid + liquid) equilibrium. The partition coefficient of ionic liquid in the 1-octanol/water binary system has been calculated from the solubility results. Experimental partition coefficients (log P) were negative at three temperatures.
季铵盐作为离子液体的前体，已由N,N - 二甲基乙醇胺作为底物制备而成。本文通过以下程序对合成化合物进行了具体的基础表征：核磁共振（NMR）和傅里叶变换红外（FTIR）光谱、含水量、质谱（MS）光谱、分解温度、纯离子液体的基础热力学性质（熔点、熔化焓、固 - 固相变焓、玻璃化转变），以及通过差示扫描量热法（DSC）测定的在熔点温度下液体和固体之间溶质热容的差异。通过动态方法在230 K至560 K的宽温度范围内测量了含有（季铵盐 + 水，或 + 1 - 辛醇）的二元混合物的（固 + 液）相平衡。这些数据通过UNIQUAC ASM和利用从（固 + 液）平衡得出的参数的修正非随机双液NRTL1方程进行关联。根据溶解度结果计算了离子液体在1 - 辛醇/水二元体系中的分配系数。在三个温度下，实验分配系数（log P）为负。
