Expanding the Solubility Parameter Method MOSCED to Pyridinium‑, Quinolinium‑, Pyrrolidinium‑, Piperidinium‑, Bicyclic‑, Morpholinium‑, Ammonium-, Phosphonium-, and Sulfonium-Based Ionic Liquids

MOSCED (modified separation of cohesive
energy density) is a solubility
parameter method that offers an improved treatment of association
interactions. Solubility parameter methods are well known for their
ability to both make quantitative predictions and offer a qualitative
description of the underlying molecular-level driving forces, lending
themselves to intuitive solvent selection and design. Currently, MOSCED
parameters are available for 130 organic solvents, water, and 33 imidazolium-based
room temperature ionic liquids (ILs). In this work, we expand MOSCED
to cover 66 additional ILs containing the pyridinium, quinolinium,
pyrrolidinium, piperidinium, bicyclic, morpholinium, ammonium, phosphonium,
and sulfonium cations using 10,052 experimental limiting activity
coefficients. The resulting parameters may readily be used to predict
the phase behavior in mixtures involving ILs.