Synthesis, physicochemical properties and structure-property relationships of novel ionic liquids [Taz(2,n)][Acgly] (n = 5, 6).

Authors

Jing Qiao, Jie Meng, Kunhao Liang, Haiyun Yao, Lanju Liang, Xuefeng Wang, Dawei Fang

Published in

RSC advances. Jul 03, 2026. Epub Jul 03, 2026.

Abstract

Two novel 1-ethyl-4-alkyl-1,2,4-triazolium acetylglycinate ionic liquids, [Taz(2,5)][Acgly] and [Taz(2,6)][Acgly], were synthesized and characterized. The density, surface tension and refractive index were systematically measured at 288.15-323.15 K by the standard addition method to eliminate the interference of trace water. The effects of temperature and cationic alkyl chain length on these properties were investigated, and the contributions of methylene groups to molecular volume, standard entropy and lattice energy were quantified. A high-precision surface tension prediction model was established by integrating molar surface Gibbs free energy into the Lorentz-Lorenz equation. The polarity scale and polarity coefficient were calculated to evaluate the polarity of the ionic liquids, and the gas-phase ion-pair association enthalpy was derived via thermodynamic cycles to reveal cation-anion interaction modes. This work enriches the fundamental property database of 1,2,4-triazolium-based ILs and provides reliable data support for the structural design and performance optimization of novel ionic liquids.

PMID:
42405147
Bibliographic data and abstract were imported from PubMed on 06 Jul 2026.

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