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Preparation and Characterization of New Phosphonyl‐Substituted Imidazolium Ionic Liquids
Author(s) -
Mu Zonggang,
Zhou Feng,
Zhang Shuxiang,
Liang Yongmin,
Liu Weimin
Publication year - 2004
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200490227
Subject(s) - ionic liquid , chemistry , characterization (materials science) , glass transition , molar ratio , atmospheric temperature range , phase transition , chemical engineering , ionic bonding , phase (matter) , thermal , organic chemistry , inorganic chemistry , ion , thermodynamics , nanotechnology , polymer , catalysis , materials science , physics , engineering
A new series of diethoxyphosphinyl‐substituted imidazolium ‘room‐temperature ionic liquids’ (RTILs) were synthesized and characterized. The new compounds 1 – 12 ( Table 1 ) were shown to have similar densities, but higher viscosities, than common ionic liquids. The new materials remain liquid over a broad temperature range, possess extremely low vapor pressures, display relatively high thermal stabilities (up to 325°), and decompose in a two‐step process. Analysis of the solid/liquid phase transition showed that all of the new RTILs possess low glass‐transition temperatures ( T g ) associated with an intense change in molar heat capacity (Δ C pm ).