[smurf88]

I did a complexation between 3,4-dihydroxybenzaldehyde 4-methylthiosemicarbazone with Ni(II) chloride. I added ammonia solution (30%) as the catalyst. In the end,how do I know that the ligand didn't react with ammonia but with the nickel salt?
FYI, end of the reflux, I got dark precipatate. I didn't get any precipitate if I didn't use ammonia solution.
Anyone could help me with this is much appreciated!