Thermal properties of novel oligoether-substituted ionic liquids and the influence of alkyl-substituent isomery

• Published in: Fluid phase equilibria 2020-06, Vol.514, p.112561, Article 112561
• Main Authors: Rotrekl, Jan, Jandová, Věra, Storch, Jan, Velíšek, Petr, Cuřínová, Petra, Schwarz, Jaroslav, Wagner, Zdeněk, Bendová, Magdalena
• Format: Article
• Language: English
• Subjects: Ionic liquids; Isobaric molar heat capacity; Mathematical gnostics; Structure-property relationship; Thermal stability
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2020.112561

This paper is a continuation of a study focused on thermodynamic properties of isomeric and quasi-isomeric ionic liquids. In this work 5 novel ionic liquids were synthesized, namely 1-(2-(2-ethoxyethoxy)ethyl)-3-alkylimidazolium bis(trifluoromethylsulfonyl)imides, where alkyl stands for different C5 substituents. These species were characterized as to their isobaric molar heat capacity and thermal stability. The results are discussed with respect to different substituent isomerism and compared with data from our previous work (Rotrekl, Fluid Phase Equilib. 2017) that reported on a similar group of isomeric ionic liquids, namely 1-butyl-3-alkylimidazolium bis(trifluoromethylsulfonyl)imides. Data analysis of the experimental heat capacites was carried out using a non-statistical approach of the mathematical gnostics. The conclusions drawn from the present work bring an insight into the fine structure-property relationship which is useful in the development of predictive tools as well as it direct applications such as in energy storage or thermal fluids development.