Synthesis and Physiochemical Properties of Supramolecular Phosphonium–Based Symmetrical Dicationic Ionic Liquids

In the present work, a novel phosphonium-based
dicationic ionic liquids (DCILs) were synthesised and
characterised using 1H NMR and elemental analysis.
Physiochemical properties such as density and viscosity are
measured and reported for a temperature range of (293.15 to
353.15) K while the refractive index was measured in the range
(293.15 to 333.15) K. The start and decomposition temperatures
are determined at heating rate 10 °Cmin-1. The influence of the
spacer alkyl chain on these properties is discussed. The results
show that the new DCILs possess lower density higher thermal
stability and higher viscosity compare to monocationic ionic liquids