In the presence of light, thionin dye reacts with iron (II) ions to form a colorless dye. What color of light causes this reaction to occur? Learn some simple tests you can do to figure this out!
Thanks for the demonstration! This could have uses for chemical reactions where the presence of Iron (III) ions is useful: they could work as electron acceptor and be reduced to iron (II), thus a catalytic cycle is formed.
Well I’m currently looking into using them for photography. Looking for compounds that react with visible light in a reversible manner, and I stumbled upon this.
@@luna010 what other things have you found so far? Do You understand how photosensitizers work in color film and the complicated matters of electron transport , quenching of energy and such that? Cuz I sure don't!
Besides a bunch of pi-pi bonds and resonate structures, what makes this molecule a special 'system' that allows it to participate in photoredox reactions like this?
Thank you for this suggestion. You can learn a bit more about the mechanism and other aspects of this reaction here www.chemedx.org/blog/exploring-“two-faced”-thionin-reaction
Let's see a QR code in gelatin, with a 😜 in the middle or a 👍. Do you have a logo? Tag. Symbol? Trademark? With the right yellow blocking filter a sodium lamp under & maybe strontium lamp from the top ... Yeah.... maybe
Is the solution toxic and i notice the gloves so im àssuming it cant be handle directly , i was thinking that would make a interesting toys for kids but i strongly believe that would be to dangerous
If you put electrodes between the transparent part and the colored part you get a potential? Can you add a potential to get the same effect without light? What are the counter ions and PH and what effect to do they have?
Great idea regarding measuring potential difference between the two sides of the solution!! If you'd like to learn more, check out the following link (and references contained therein) www.chemedx.org/blog/exploring-“two-faced”-thionin-reaction
Are you going to try it? Or get your class to play with the idea? What about Methylene blue? It's very similar, just not sure there's enough potential at the peek of its absorption wavelength to do the same thing. It's cheaper and easier for me to get. How would one demethylate Methylene blue?
I never got thionine to try myself, but apparently the answers are YES! It's called the photogalvantic effect. Studied by E. Rabinowitch at MIT till 1940. Not much work has been done on on this or similar chemistry since, that's like no progress in 80 years!!!! Isn't that crazy!
