Is anyone here familiar with luminol? (radical reactions)

  • Thread starter Thread starter rwooduk
  • Start date Start date
  • Tags Tags
    Reactions
AI Thread Summary
The discussion centers on the use of luminol to visualize cavitation through sonochemiluminescence, where ultrasound induces bubble cavitation that generates radicals. The mechanism involves luminol primarily existing as a monoanion, which oxidizes hydroxyl radicals to produce a diazaquinone radical anion. This species reacts with superoxide radicals to form a hydroperoxide addition product, eventually leading to the emission of blue light at 430 nm. A key question raised is whether hydrogen radicals could initiate a similar reaction in place of oxygen radicals. The author expresses interest in exploring luminol's reactions with various oxidants and its potential as a radical detector. The discussion concludes with a note that the initial issues encountered were related to the reaction environment affecting radical production, and a paper on the findings is forthcoming.
rwooduk
Messages
757
Reaction score
59
I am currently using luminol to visualise cavitation via sonochemiluminescence. When bubbles in solution are exposed to ultrasound they cavitate and draw vapour inside them. The bubbles crush the vapour breaking bonds and radicals are produced.

These radicals then do the following (from my own work)...

The mechanism can be described as follows; luminol (I) exists predominantly as the monoanion species (II) oxidising the •OH and producing the diazaquinone radical anion (III) [17]. This species react with •O to form a hydroproxide addition product (IV) which through decomposition and relaxation forms the aminophthalate monoanion (V), this deactivates via florescence and emits characteristic blue light at 430 nm [13, 17-20].

My question is, what if there were •H radicals in solution instead of •O radicals, could the same reaction happen?

I have the idea that I could look how luminol reacts with oxidents, or if it is used as a radical detector, but I am unsure of where to start.

Also what would the main differences be between H and O radicals in a physical sense?

Thanks in advance for any thoughts / ideas on this.
 
Chemistry news on Phys.org
Yes, all sorted now, the problem was the environment in which the reactions were taking place that could produce radicals in different numbers. Paper on the way (hopefully!)
 

Thread 'Solubility of MgSO47H2O in water'

It seems like a simple enough question: what is the solubility of epsom salt in water at 20°C? A graph or table showing how it varies with temperature would be a bonus. But upon searching the internet I have been unable to determine this with confidence. Wikipedia gives the value of 113g/100ml. But other sources disagree and I can't find a definitive source for the information. I even asked chatgpt but it couldn't be sure either. I thought, naively, that this would be easy to look up without...
View full post »

Thread 'Why does having 8 valence electrons make an element inert?'

I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!
View full post »

Similar threads

Understanding luminol under ultrasound
Replies
2
Views
3K
How to Determine Reaction Products from Given Reactants?
Replies
3
Views
8K

Hot Threads

Recent Insights

Back
Top