Homonuclear Trihalides

The four homonuclear trihalides Xi" (X = F, Cl, Br, and I) are the simplest hypervalent systems. It should be remembered that Xi" is an AXJ system, where the central atom A is the same as the terminal atoms X. The aqueous bond energies have been discussed above. Figures 7-10 show the collision-induced dissociation results for these ions in the gas phase. Reactions 6a and 6b were the observed products for all four halogens studied. 

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