For the synthesis of complexes of transition metals with substituted hydroxycinnamic acids, to be specific, p-coumaric acid and ferulic acid.
hello
well, before you start the procedure you have to determine if it is possible to form stable chelation complexes ( stable memberd reign) . some ligands are monodentat and some bidentat or multidentat. according to Jürgen Wintne answer the second PDF included the bidentat 4-memberd ring . now if you are looking for monodentate use the first PDF .
deprotonate the acid using sodiumcarbonate to obtain the salt of the acid. stirr/reflux of methanolic solution of the salt and metal salt or suitable solvent for product optimization.
Please see attached paper based on zinc-ferulate MOF. It named as "a phytochemical-containing metal–organic framework: Synthesis,
characterization and molecular simulations for hydrogen adsorption".
I hope this helps you.
For clean reactions, you could first isolate the sodium salts of your hydroxycinnamic acids following the procedure outlined in the first pdf provided by Jürgen Wintner. Then you can carry out stoichiometric reactions (1:2, 1:3 etc.) with transition metal salts in aqueous solutions. If you are lucky, pure products will precipitate under these conditions.
Another option is to try reactions of transition metal acetates and the free hydroxycinnamic acids in ethanol. There is a chance that under these conditions acetic acid will be liberated and pure transition metal complexes will crystallize out upon standing. The advantage of this method (if it works) would be that you have no salt-like by-products. Good luck!
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