文献类型：期刊文献

英文题名：Physicochemical properties of deep eutectic solvents formed by choline chloride and phenolic compounds at T = (293.15 to 333.15) K: The influence of electronic effect of substitution group

作者：Zhu, Jiahong[1];Yu, Keke[1];Zhu, Yugang[1];Zhu, Ruyu[1];Ye, Fangfang[1];Song, Ning[1];Xu, Yingjie[1]

机构：[1]Shaoxing Univ, Dept Chem, Shaoxing 312000, Zhejiang, Peoples R China

年份：2017

卷号：232

起止页码：182

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：SCI-EXPANDED(收录号：WOS:000399507400019)、、WOS

基金：The authors are grateful for the financial supports from the Undergraduate Scientific and Technological Innovation Project of Shaoxing City (no. 2016R06) and Zhejiang Province (no. 2016R428031), Key Teacher Training Research of Shaoxing University (no. 2016227), and the National Natural Science Foundation of China (no. 21406140).

语种：英文

外文关键词：Deep eutectic solvent; Choline chloride; Phenols; Physicochemical property; FT-IR spectra

外文摘要：Three deep eutectic solvents (DESs) were synthesized using choline chloride (ChCI) and phenolic compounds (phenol, p-cresol, and p-chlorophenol) as hydrogen bond donors (HBD) with a molar ratio of 1:2 (ChCl:HBD). Densities (rho), viscosities (eta), and refractive indices (n(D)) of DESs were measured at T = (293.15 to 333.15) K under atmospheric pressure. Temperature dependence of rho and eta were fitted by empirical equations, and thermal expansion coefficient (alpha(p)) and activation energy for viscous flow (E-eta) were obtained accordingly. FT-IR spectra of DESs were determined and compared with the corresponding HBDs. Based on physicochemical properties and FT-IR spectra, the influence of electronic effect of substitution group of HBD on hydrogen bond interaction between ChCI and HBD was explored. The results show that the electronic effect of HBD plays an important role on the strength of hydrogen bond interaction of O-H center dot center dot center dot Cl- of DES. The strong electron-withdrawing property of Cl group of p-chlorophenol can strengthen the hydrogen bond interaction O-H center dot center dot center dot Cl-, which leads to higher rho, eta, and n(D) of DES formed by ChCI and p-chlorophenol. Conversely, CH3 group of p-cresol exhibits electron-donating effect, resulting in weaker hydrogen bond interaction and lower rho and n(D) of DES formed by ChCI and p-cresol. Consequently, the strength of hydrogen bond interaction of O-H center dot center dot center dot Cl- between ChCl and HBD of DES is as follows: p-chlorophenol > phenol > p-cresol. (C) 2017 Elsevier B.V. All rights reserved.