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Zintl cations

When tellurium is treated with concentrated sulfuric acid, the result is a red solution of the Zintl ion, Te. The oxidation of tellurium by AsF in liquid SO produces the same square planar cation, in addition to the trigonal prismatic, yellow-orange Te:

Other tellurium Zintl cations include the polymeric Te and the blue-black Te, consisting of two fused 5-membered tellurium rings. The latter cation is formed by the reaction of tellurium with tungsten hexachloride:

Interchalcogen cations also exist, such as Te Se (distorted cubic geometry) and Te Se. These are formed by oxidizing mixtures of tellurium and selenium with AsF or SbF.