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The new compound [Ba(en) 4 ] 2 As 4 Te 6  has been prepared by reaction of appropriate mixtures of the elements in dry ethylenediamine. It crystallizes in the monoclinic system, space group P2 1 /n with a = 1776.0(6) pm, b = 1459.9(6) pm, c = 1000.0(4) pm, β = 101.8(1)°. The As 4 Te 6  4-  anion forms a six-membered ring As 4 Te 2  of chair conformation, in which two As-As groups are bridged by Te atom s. A t each As atom a further exocyclic Te neighbour is bonded in the equatorial position. The Ba 2+  cation is eight-coordinated by the bidentate ethylenediamine ligand.

[Ba(en) 4 ] 2 As 4 Te 6 , das erste Telluridoarsenat / [Ba(en) 4 ] 2 As 4 Te 6 , the First Telluridoarsenate