I have tried to make DES with choline chloride and urea at mole ratio 1:2, however, there is a liquid obtained at above 70C but on settling down to room temperature the liquid solidifies into needle-like crystals. Why is so? Can anybody share the thought, please!
A DES is generally characterized by a lower melting point than that of the individual constituents. Most DESs are formed in a liquid state, which can be preserved also at room temperature. DES is typically prepared by mixing hydrogen bond acceptor (HBA) compound with a hydrogen bond donor (HBD). The interactions between the hydrogen bond donor and the hydrogen bond acceptor cause the charge of the compound to be delocalized and the lattice energy to decrease; consequently, the melting point decreases, which is why the mixture is referred to as a deep eutectic solvent. Deep eutectic solvents(DES) is a new type of environmentally green solvents.water contamination is not a problem for purpose and dries the ChCl very thoroughly, then weighs it quickly and so far it has worked very well.
https://www.researchgate.net/post/How_do_I_prepare_the_Choline_ChlorideUrea_12_DES
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