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The reaction of the Zintl compound K(4)Ge(9) with Te and Ga(2)Te(3) in ethylenediamine (en) at 190 degrees C gave the germanium polytelluride {[Ga(en)(3)](2)[(GeTe)(2)(Te(5))(6-)(Te(8))(4-)]}(n) (1). The single-crystal structure analysis revealed that 1 has two different polytelluride fragments: cross-shaped 36-e(-) TeTe(4)(6-) anions and boat-shaped 52-e(-) Te(8)(4-) rings. The new material is a p-type semiconductor at room temperature and switches to n-type at 380 K.
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Zhang et al. (2009) studied this question.
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