What orbitals are used in the bond formation between iodide and iodine molecule to give triiodide ion?

14 May 2023 1 825 Report

There is no clear explanation for the formation of triiodide anion from the reaction of iodine molecule with iodide ion.

Jürgen Weippert

In the simplest FMO/NBO approximation, you just have three pz orbitals as depicted here:

https://commons.wikimedia.org/wiki/File:I3-NBOs.png

Of course, there will also be some interaction between the px and py orbitals, but pi bonds as known for L-shell elements aren't formed for elements in the lower periods.

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