Talk:Thallium triiodide

Structure images

I've added a space-filling model of the crystal structure to the infobox, and there are three further images available, which I'll put here in case needed.

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Ben (talk) 22:01, 12 February 2009 (UTC)

Isoelectronic substances

In the article, it says:

TlI₃ is no exception as it is possible to stabilise thallium(III) with excess I⁻ forming the TlI⁻
₄ ion (isoelectronic with the tetraiodomercurate anion and with lead(IV) iodide).

How can lead tetraiodide, presumably a compound with neutral charge, be isoelectronic with an anion of single valence, tetraiodothallate (TlI⁻
₄), and with a divalent anion, tetraiodomercurate (HgI²⁻
₄) ?