I am trying to form a bismuth complex using thiosemicarbazones as ligands. Many articles I read describe the bismuth complex as a yellow precipitate orange or red but not black. I am using bismuth nitrate and tried forming the complex under reflux in methanol with the help of nitric acid. I also tried without nitric acid and without heat. Still every time I get a black fine precipitate. At first the mixture turns into a vibrant yellow color and within 20 min its starts to darkened. Can someone help me understand what is going on.
Thank you
Tal vez estas formando sulfuro de bismuto(es negro) por hidrólisis de la tiosemicarbazona. Algo como esto: Article Synthesis of Bi 2 S 3 Nanostructures from Bismuth(III) Thiou...
Hi Melissa Beltran, as you said, pure bismuth bismuth complexes comprising thiosemicarbazones as ligands are normally yellow, orange, or red in color. As Marcos Cota stated, hydrolysis and formation of Bi2S3 might be a possible reason for the observation of a dark precipitate. If that is the case, hydrolysis could be avoided by using dry methanol and anhydrous BiCl3 as starting material. You might as well consider the fact that some bismuth(III) complexes can be light-sensitive.
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