Hi!
I`ve read lots of articles "how to make DES", and that is what I`m interested in:
It`s absolutele clear that "to make DES you need just combine substance 1(HBA) and substance 2 (HBD) in a known molar ratio, then heat and stirring until homogeneous liquid is formed - congratulation - you`ve got DES!"
Ok, let`s try. I took ChCl and Oxalic acid in molar ratio 1:2, put them on water bath (80oC), made them constantly stirred. They formed liquid, I took them away from water bath and let them cooled. And they become solid immediately after cooling.
So where is the problem? I made it without water. Maybe they need some water ?
Or it`s normal that they become solid, and I need to carry out all my subsequent experiments at 40-50oC?
Freezing point of Choline chloride:oxalic acid 1:1 DES is reported as 34 deg. C. So yes, it's normal and you need slight heating to make it liquid.
Aparently, with more oxalic acid, melting point is higher, so you'll need more heating. https://pubs.acs.org/doi/full/10.1021/ja048266j?src=recsys
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