When the complex is dissolved in ethanol, the IR results are changed. The additional alcohol leads to a greatly exaggerated peak in the IR spectrum around 3500(cm-1). To combat this, the complex was removed from solution and dried in order to use it in a solvent that did not contain alcohol.
Four complexes were prepared using aluminium, copper, iron (III), and iron (II). Laboratory supplied curcuminoids (all three were used) were dissolved in methanol. The cation solutions were then added. Finally, a drop of triethylamine was added before the solutions were refluxed for an hour.
After refluxing, the solutions were left to evaporate over the weekend.
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| Curcumin-Aluminum Complex |
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| Curcumin-Copper Complex |
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With the exception of the iron(III), all complexes were slightly sticky.
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| Curcumin-Iron(II) Complex |
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| Curcumin-Iron(III) Complex |
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The complexes were all dissolved in dichloromethane for use with IR spectroscopy. They were much more soluble in ethanol than dichloromethane.
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7/2/18
-Alex Griffith
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