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    $\begingroup$ This is not an answer to the question, while the observation of Pb2Ph6 is interesting, it does not answer the question about Pb2H6. $\endgroup$
    – Nuclear Chemist
    Commented Oct 9, 2022 at 12:07
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    $\begingroup$ Apparently, protonated diplumbane $\ce{Pb2H7+}$ have been predicted to be energetically favorable to varying degrees. $\endgroup$
    – Nilay Ghosh
    Commented Oct 9, 2022 at 17:18
  • $\begingroup$ @NuclearChemist please see my update. On this basis the claim should be resolved. $\endgroup$
    – Oscar Lanzi
    Commented Oct 9, 2022 at 17:19
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    $\begingroup$ @NilayGhosh I saw this. One notable feature: the proton inserts itself into the lead-lead bond si that the protonated species no longer has a direct bond between the lead atoms. $\endgroup$
    – Oscar Lanzi
    Commented Oct 9, 2022 at 17:20
  • $\begingroup$ The Pb2H7 ion is interesting, maybe it has a three centre two electron bond. But the species is clearly not something with a Pb-Pb bond. I reason that Pb2H7 could be reasoned to relate to MeOMe while Pb2H6 could be argued to relate to ethane. $\endgroup$
    – Nuclear Chemist
    Commented Oct 11, 2022 at 3:28