Im work in on vanadium schiff base complexes. but everytime it will be polymerised. what is reason about the reaction. any other option to obtain the crystal from the vanadium schiff base complexes. what are the best solvent for the recrystal of vanadium schiff base complexes. i already try with methanol/dichloromethane and ethanol and water. some cases, they do the reaction in room temp. heating is mentatory for vanadium schiff base complexes or not?
For recrystallizing vanadium Schiff base complexes, the best solvents include acetonitrile, toluene, and diethyl ether, as they can dissolve the complexes at higher temperatures and facilitate slow crystallization upon cooling. While methanol/dichloromethane, ethanol, and water have been tried, acetonitrile and toluene offer different polarity options that might yield better crystals. Heating is not always mandatory but can be beneficial to dissolve the reactants completely and ensure uniform mixing. Slow cooling from a heated solution often promotes better crystal growth.
If you are seeing oligomerization/polymerization through V-O bonds, you could try adding a ligand to bind to prevent that. If there's an open site, can use pyridine in place of triethylamine. If it's through V-OH bonds, you could try recrystallizing from methanol or ethanol, which might generate M-OR bonds.
Strong donor solvents like DMF and DMA could dissolve your complexes, and then you could crystallize them out by vapor diffusion of ether
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