Density, Viscosity, and Electrical Conductivity of 1-Alkyl-3-methylimidazolium Dicyanamide Ionic Liquids

doi:10.1021/acs.jced.0c00754

	Density, Viscosity, and Electrical Conductivity of 1-Alkyl-3-methylimidazolium Dicyanamide Ionic Liquids
	Zheng, Yong 1; Zheng, Yongjun 1; Wang, Qian 2; Wang, Zhen 1
刊名	JOURNAL OF CHEMICAL AND ENGINEERING DATA
	2021-01-14
卷号	66 期号:1 页码:480-493
ISSN号	0021-9568
DOI	10.1021/acs.jced.0c00754
英文摘要	A series of 1-alkyl-3-methylimidazolium dicyanamide ionic liquids ([C(n)mim][N(CN)(2)], n = 2, 3, 4, 5, and 6) were synthesized and characterized in this work. The density, viscosity, and electrical conductivity of these ionic liquids were measured from 293.15 to 353.15 K at 101.3 kPa using a high-precision vibrating tube density meter, an automated falling ball viscometer, and a conductivity meter, respectively. On this basis, the corresponding molar volume and molar conductivity were also obtained. All experimental values were well-fitted by the empirical equations. Remarkably, these ionic liquids exhibit much lower density, lower viscosity, and higher electrical conductivity than many other conventional ionic liquids. According to the theoretical calculations, the weaker cation-anion interaction and V-shaped and nonspherical structure of the dicyanamide anion are considered as major reasons for these properties. Meanwhile, the extension of the alkyl side chain length can result in lower density, higher molar volume, higher viscosity, and lower conductivity. This phenomenon is probably ascribed to the decreasing molecular symmetry, enhanced hydrogen bonding, and increasing steric hindrance of ionic liquids. The relationship between viscosity and molar conductivity has been also investigated using the Walden rule, which confirms the high ionicity of [C(n)mim][N(CN)(2)]. The enhanced dissociation of ions may favor the ionic fluidity and conductivity. It is hoped that these experimental results and theoretical findings may be useful for the future development of dicyanamide-based ionic liquids.
资助项目	National Natural Science Foundation of China[21406002] ; National Natural Science Foundation of China[21702005] ; Program for the Young Key Teachers in Henan Province[2017GGJS175] ; Key Scientific Research Projects of Colleges in Henan Province[20B530001] ; Scientific Research Foundation of Anyang Institute of Technology[YPY2020005]
WOS关键词	N-METHYLDIETHANOLAMINES MDEA ; PHYSICOCHEMICAL PROPERTIES ; THERMOPHYSICAL PROPERTIES ; AQUEOUS MIXTURES ; THERMODYNAMIC PROPERTIES ; HYDROGEN-BOND ; ELECTRODEPOSITION ; ELECTROCHEMISTRY ; PERFORMANCE ; BEHAVIOR
WOS研究方向	Thermodynamics ; Chemistry ; Engineering
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000611409200046
资助机构	National Natural Science Foundation of China ; Program for the Young Key Teachers in Henan Province ; Key Scientific Research Projects of Colleges in Henan Province ; Scientific Research Foundation of Anyang Institute of Technology
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/47867]
专题	中国科学院过程工程研究所
通讯作者	Zheng, Yong
作者单位	1.Anyang Inst Technol, Coll Chem & Environm Engn, Anyang 455000, Henan, Peoples R China 2.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Yong,Zheng, Yongjun,Wang, Qian,et al. Density, Viscosity, and Electrical Conductivity of 1-Alkyl-3-methylimidazolium Dicyanamide Ionic Liquids[J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA,2021,66(1):480-493.
APA	Zheng, Yong,Zheng, Yongjun,Wang, Qian,&Wang, Zhen.(2021).Density, Viscosity, and Electrical Conductivity of 1-Alkyl-3-methylimidazolium Dicyanamide Ionic Liquids.JOURNAL OF CHEMICAL AND ENGINEERING DATA,66(1),480-493.
MLA	Zheng, Yong,et al."Density, Viscosity, and Electrical Conductivity of 1-Alkyl-3-methylimidazolium Dicyanamide Ionic Liquids".JOURNAL OF CHEMICAL AND ENGINEERING DATA 66.1(2021):480-493.