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The first polynuclear mercury-tellurium anions [Hg4Temath image] and [Hg2Te5]2⊖ could be obtained by extraction of K[BOND]Hg[BOND]Te alloys with ethylenediamine. The structures are related; an Hg2Te3 ring with two exocyclic Hg-bonded tellurium atoms is contained in both anions. [Hg4Te12]4⊖ is formally a dimer of the repeat unit of the polymeric math image[Hg2Te5]2⊖1 with two additional Te toms per dimer.