I've seen a paper by Sikalov [1] that says that $\ce{IH3}$ and $\ce{IH5}$ should be observable. Has anyone actually tried to synthesize such molecules?


  1. Sikalov, A. A. Hypervalent Halogen Hydrides $\ce{HalH_n}$ ($\ce{Hal}$ = $\ce{Cl},$ $\ce{Br},$ $\ce{I};$ $n = 3, 5, 7)$: DFT and Ab Initio Stability Prediction. Theor Chem Acc 2019, 139 (1), 8. DOI: 10.1007/s00214-019-2524-0.
  • $\begingroup$ I've done some literature research but couldn't find anything... $\endgroup$ – Mr.X Dec 13 '19 at 15:32
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    $\begingroup$ Under high pressure, maybe? Also is there a reason to put iodine first not hydrogen as in ordinary hydrogen iodide? $\endgroup$ – Oscar Lanzi Dec 13 '19 at 15:46
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    $\begingroup$ Oscar Lanzi , in this case, some of Hydrogen atoms are negatively charged. That's probably why the author uses such notation. $\endgroup$ – Mr.X Dec 13 '19 at 16:29

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