Neue Silber(I)‐oxotellurate(IV/VI)

New Silver(I) Oxotellurates(IV/VI) Reactions of Ag 2 O and TeO 2 at elevated oxygen pressures resulted in three new silver oxotellurates: Ag 2 Te 4 O 11 ( $P{\bar 1}$ , a = 7,287(4), b = 7,388(3), c = 9,686(7) Å, α = 95,67(3)°, β = 94,10(3)°, γ = 119,40(3)°, Z = 2, 1973 independent reflections, R 1 = 2,51 %, wR 2 = 5,42 %) and two modifications of AgTeO 3 (AgTeO 3 ‐I: P 2 1 / n , a = 5,9099(5), b = 11,6831(8), c = 8,0305(7) Å, β = 100,424(7)°, Z = 4, 1249 independent reflections, R 1 = 7,72 %, wR 2 = 13,24 %; AgTeO 3 ‐II: P 2 1 / m , a = 5,4562(5), b = 7,4009(7), c = 6,9122(7) Å, β = 101,237(2)°, Z = 2, 1221 independent reflections, R 1 = 2,84 %, wR 2 = 6,16 %). All the three compounds contain tellurium in the oxidation states +4 and +6. Te 6+ is coordinated by distorted octahedra of oxygen atoms in each case, while the lone pair of Te 4+ is stereochemically active, and the coordination numbers are 5 in Ag 2 Te 4 O 11 and AgTeO 3 ‐II (distorted square pyramids, pseudo octahedra) and 4 in AgTeO 3 ‐I (pseudo trigonal bipyramid). All compounds show diamagnetic and insulating behaviour.