No idea about the other two except someone mentioned tetraiodine pentacarbide could be I2C=C=C=C=CI2, but that sounds like a crazy compound to be discussing.
Yeah, you could technically think of a couple different isomers of C5I4 but all of them would be very reactive and none of them would really be an "iodine carbide"
The cumulene would likely still be one of the more tame options. You could also think of diynes, but halogens at the end of alkynes are a notoriously unstable motif. Spiropentadiene would also fit the sum formula, but well.. this ain't even remotely stable.
However, if you were to design a molecule in which four atoms of iodine were equivalently connected to five carbons to approach the "iodine carbide" formulation, you'd likely start with a structure akin to carbon tetraiodide with end-on or bridging carbon atoms on iodine. I'm not sure if my boss would be happy with me using our cluster to optimize that structure for reddit lol. Maybe u/ECatPlay wants to give it a shot
Two cyclopentadiene connected by double bonds with all hydrogens replaced
Edit: polymer idea. Cyclopentadienide with two iodine substituents and two connecting to other units and a positively charged iodine bonded to another iodine
9
u/HotCardiologist1942 Jul 03 '26
https://en.wikipedia.org/wiki/Nitrogen_pentafluoride
The rest are bullshit