The tellurometalate ions [GaTe3]3− and [In3Te7]5− have been prepared by chemical reduction of Ga2Te3 and In2 Te3, respectively, by potassium in liquid NH3 in the presence of an encapsulating ligand. The [GaTe3]3− ion is essentially trigonal planar; the [In3Te7]5− ion is cuboidal, where one corner is missing (structure shown on the right). These anions have no counterparts in S or Se chemistry.
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Park et al. (1995) studied this question.
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