CRSEXP008

=Researcher= Cuepil Choi =Objective= To see if an ionic eutechtic solvent made of urea and choline chloride could be of any use to any of our previous experiments as a "green solvent." Ideas were based off of this paper. =Procedure= A 2:1 mole ratio between urea to choline chloride were taken and placed on a hotplate until the solvent turned clear. After cooling, 4-chlorobenzaldehyde was added to conduct any of our previous experiments in this mixture to study the effects of the solvent. =Results= [|HNMR spectrum 1] - eutechtic solvent by itself 65:34 ratio between urea to choline chloride according to google appscript integration. =Discussion= Further experiments with this solvent is unlikely due to 4-chlorobenzaldehyde's low solubility in the solvent. =Conclusion= The mixture successfully became an eutechtic solvent, but failed to take in very good amounts of 4-chlorobenzaldehyde, contrary to the paper's solubility findings of 4-chlorobenzaldehyde in the ionic eutechtic solvent. =Log=

2013-07-18
11:43 mass of erlenmeyer flask 72.415g 11:46 4.467 g chloline chloride added to flask 11:50 3.784 g urea added to flask 11:57 mixture placed on hot plate. Stirred occassionally. 12:12 mixture turned clear, two specs of urea still undissolved. Taken off of hot plate 12:22 mixture pipetted into NMR tube 12:30 mass of vial was 11.7727g 12:32 0.1243 g of 4-chlorobenzaldehyde added to vial 12:36 1.4615 g of eutectic solvent added to 4-chlorobenzaldehyde 12:41 solvent had trouble dissolving 4-chlorobenzaldehyde, 0.4903 g of eutectic added. 12:43 0.4939 g of eutectic added 12:47 0.4939 g of eutectic added 12:47 0.7515 g of eutectic added. Solvent still having trouble taking in much of solute. Insolubility event declared at room temperature 12:55 mixture heated with heat gun to melt 4-chlorobenzaldehyde. Mixture of solvent and solute did not mix, two separate layers formed. 14:43 HNMR spectrum 1 taken of eutechtic solvent alone at 26.6 C with an outer tube containing deuterated water. Deuterated water set to 4.8 ppm