Jan e Kharabat
Established member
So, I tried to reduce harmaline with magnesium powder (didn't have the ribbon at the moment). I used about 2.7g of harmaline dissolved in 150ml acetic acid and around 900mg of magnesium powder. The reaction was quite fast and violent with a very rapid release of hydrogen. The powder remained stuck on the surface and would not sink down like zinc powder even upon stirring. The beaker became somewhat hot, but not too much. After a while the reaction stopped, but some magnesium powder was still left. Upon adding more acetic acid the reaction continued again. I also noticed some dark brown colored particles floating on the surface. I collected them with my stirring rod and found that they were quite sticky.
After a few minutes, the solution changed its color and became lighter, but the fluorescence was still green, same as before. Somehow, the magnesium reacted with acetic acid while leaving the harmaline unchanged. The change in color was likely due to the increased concentration of magnesium salts. After filtering I basified with ammonia, no clouding occurred up until pH 8.5 or so (don't exactly remember, but definitely above 8 ). Despite the clouding, nothing precipitated until pH 10 or so. I brought the pH to 10.7, the clouding stopped and the precipitate particles were very fine. I filtered and dried the precipitate and could clearly tell... there was a shit load of magnesium stuff in there (magnesium hydroxide?). The precipitate was very "cakey" and had a gelatinous texture. I will perform Manske and see what happens.
In any case, it can be concluded that the mere color change is not an indicator of successful reduction, the fluorescence has to become blue as well. Also, that the concentration of metal salts likely effects when and how the precipitation occurs.
Feedback and suggestions, specially from folks who know a bit of chemistry are very welcomed and much appreciated.
After a few minutes, the solution changed its color and became lighter, but the fluorescence was still green, same as before. Somehow, the magnesium reacted with acetic acid while leaving the harmaline unchanged. The change in color was likely due to the increased concentration of magnesium salts. After filtering I basified with ammonia, no clouding occurred up until pH 8.5 or so (don't exactly remember, but definitely above 8 ). Despite the clouding, nothing precipitated until pH 10 or so. I brought the pH to 10.7, the clouding stopped and the precipitate particles were very fine. I filtered and dried the precipitate and could clearly tell... there was a shit load of magnesium stuff in there (magnesium hydroxide?). The precipitate was very "cakey" and had a gelatinous texture. I will perform Manske and see what happens.
In any case, it can be concluded that the mere color change is not an indicator of successful reduction, the fluorescence has to become blue as well. Also, that the concentration of metal salts likely effects when and how the precipitation occurs.
Feedback and suggestions, specially from folks who know a bit of chemistry are very welcomed and much appreciated.