i am preparing lanthenide metal complexes of benzylidene amino benzoic acid. Is there any need to maintain the basic ph-range for the synthesis of benzylidene amino benzoic acids lanthenide complexeses? if it is needed so which basic reagent is suitable in presence of COOH group.
It all depends on the way you are preparing or following. In aqueous media, Lanthanide solution must be below ph 3 to avoid the hydrolysis products. Instead of adding metal and ligand together in same solution and adjusting the ph, it's always preferable to add ligand solution adjusted to above its pka value to have maximum anionic form and then add it to metal solution. You can use either NaOH or ammonia for ph adjustments
You can use either NaOH or ammonia to adjust your ligand solution to be a basic solution, then add your lanthanide solution into it. After this, the pH value of the mixture will decrease, then adjust the pH to be weak acidic by slow addition of NaOH or ammonia.
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