I synthesized Co(II) triazole Schiff base complex using Co(II) acetate tetrahydrate in 2:1 ratio (L:M). The ligand is synthesized from 3-amino-5-mercapto-1,2,4-triazole with benzaldehyde derivative. I stirred together the cobalt salt with the Schiff base for 4 hours at room temperature. Filtered the precipitate and washed with etoh. After dried, tested for every solvents but only dissolve partially in dmso.
Then, I tried to dissolve it in dilute HCl. It completely dissolved and gives a light orange color, after I added acetone and mixed it together, it gives a light blue color.
What is happening with the cobalt complex?
I suppose you've got a polymeric substance with poor solubility. This is to be expected. The protonation of ligand donor centers in diluted HCl leeds to [Co(H2O)6]2+ cation (light orange color) and aceton addition transforms it to tetrahedral [CoCl4]2- complex unit (blue color}...
Sounds like a coordination polymer to me! You could have bridging acetates or through the triazole. The acid protonates the polymer apart.
So how do I synthesize the coordinate complex of co(II) triazole schiff base complex? Do I need to add something to prevent it to form coordination polymer?
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