It is known that the complexation of a quaternary ammonium salt with a metal salt or hydrogen bond donor (HBD) resulting in DES formation. The charge delocalization occurring through hydrogen bonding between for example a halide ion and the hydrogen-donor moiety is responsible for the decrease in the melting point of the mixture relative to the melting points of the individual components. However the DES is not form between TEAI and Glycerol at 80 C and in varying molar ratios i.e., 1:2, 1.4, 1:6 and 1:8. I would like to know the reason why DES is not formed in this case.
The (usual 2 components as in your case) DES components do not interact through covalent or ionic bonds but via intermolecular forces (hydrogen bonding), inducing molecular alterations at the lattice units lowering the mp.
Since DES of glycerol /tetrabutylammonium bromide (and chloride) are fairly common (in various proportions) the Iodide ion (size and properties) may have some interference in those forces/latice ordering...Also, I do not know -(I am not an expert at DES preparation, but just using some of them)- DES including Iodide ions in their formulation (at least with glycerol based ones).
Hope it helps
hope this work may help to shed some light on the subject particularly page 80--->
https://epub.uni-regensburg.de/31832/1/Doktorarbeit_Veronika_Fischer_04_05_15.pdf
good luck
Dear Prof Americo Lemos thanks for sharing your thoughts and relevent thesis. It is realy very helpful for deeper understanding of DES insight mechanism.
I would like to thank all of you who dedicate part of your free time to my question. Your answers stimulate my thinking on the subject. I am also glad to get information from people from various countries of the world.
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