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Slow Motion Contact Explosive – Nitrogen Triiodide



The Royal Institution

Nitrogen triiodide is a highly unstable substance that detonates when disturbed. So we disturbed it.
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And if you can explain what’s going on with the flash of light, let us know!

Nitrogen triiodide is so unstable that even something like a mosquito landing on it can set it off. Three iodine atoms cluster around one side of a nitrogen atom. Being crowded around one end causes something called bond strain as the atoms repel each other in a small space. The result is that the molecule is prone to falling apart, explosively.

If you think you can explain the flash of light before the explosion, let us know in the comments below.

*Please note, this is a dangerous experiment and should not be replicated at home or in the classroom.*

For more from Andy, check out his other Tales From The Prep Room films: https://youtu.be/DFfRqoIdArM?list=PLbnrZHfNEDZyfUXqroIlSf2hOznnThqM0

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40 thoughts on “Slow Motion Contact Explosive – Nitrogen Triiodide
  1. A well-put-together video that I like but the guy is breathing too much iodine. It's not healthy. He should be using more respiratory protection or a fume Hood

  2. I don't know the cause of the light, in addition to Thermal black body emissions, you might have tribo electric or piezo-electric discharges as the crystals get squeezed and or a braided.

    The first thing I would do is put the explosion in complete darkness and get a specter off of it. Does it follow a blackbody curve or does it have some other signature.

    It wouldn't surprise me if what you're seeing is something like the the emission Spectra of monatomic nitrogen forming diatomic nitrogen. That has to be very high energy

  3. I would imagine it's something like have you seen a volcano blow up and then the gases and dust create electricity I have a feeling has something to do with that

  4. How powerful is this explosion when compared to nitroglycerin? From what I've seen it looks like a rather weak explosion (when comparing both of course)

  5. blew the windows of my bedroom from a bottle of wet NI3 that I had been crrying around in my pocket duriing school hours. When wet it is generally inert. Luckyly I was away when it happened. NI3 is very easy to makie but I won't tell you how..

  6. Question: how is nitrogen triiodide synthesised and placed on the surface, if it's so reactive? Would it explode as soon as you made it and were handling it?

  7. Chech out the Energy levels of the spectrum on elemental iodine.
    Film the decomposition reaction though a small slit. Let the path of the emitted light pass through the slit and then through a prism.
    Does the light spectrum fall into bands, or is it a continuous spectrum?

  8. Just a humorous idea for you guys, if you ever have to catch a rat that’s annoying you, sprinkle some nitrogen triiodide across the surface where he likes to run across and have a great laugh! Be sure to catch it on film as well; great laughs for anyone of your friends who have dark humour like you!

  9. don't touch me , Don't Touch Me , DON'T!!! TOUCH!!! ME!!!! BOOM!!!!!! I!! SAID!!! DON'T!!!! TOUCH!!!!! MEEEEEEEEEEE!!!!!!!!shit!.

  10. I think the flash is caused by the heating of the material for a brief moment so hot that it emits light. Like a hot piece of metal that a blacksmith hammers into a blade.

  11. Astatine is way worse.
    Let's imagine that I somehow used astatine-210 as the source, since they last the longest – about 8 hours.
    You see, Cl, Br and I don't really want to fit: they're squeezed all together.
    Imagine that it's astatine.
    There is astatide, At-, so I can imagine that there might be an NAt3.
    Astatine has an atomic number of 85, which is 12.143 times heavier than nitrogen.
    So NAt3 either,
    1) mightn't exist at all,
    or 2) might be even more explosive than NI3 would be.

  12. CAVITATION!! 😀 I am not a chemist and I have no proof of this. But does sound like cavitation, as air molucules are violently pushed out of the way. Perhaps tryboluminiscence.

  13. I had a teacher who told us about "something you mix with ammonia" and using it for pranks on fellow classmates in college. It was 15 years later when I learned that that "something" was iodine

  14. I don't know for sure what is going on, but any time you are breaking chemical bonds and forming new ones, the new molecules can be born with electrons in an excited state, and the electrons lose the excess energy by emitting light.

  15. I did this as a 14 years old for fun…..ha ha you mix iodine tincture with amonium then let it dry and have fun with it.We put it wet on the chalkboard for the teacher and when he tried to write…Ka-BOooOOMM

  16. dark room, set up a diffraction grating and incredibly sensitive photographic film, CCD or CMOS sensor and see what wavelengths are produced, if it's due to heat, it should have a black body spectrum minus the iodine and nitrogen peaks, if it's electron excitation and emission you'll see something else.

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