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The ytterbium(III) oxide bromide oxidotellu-rate(IV) Yb 3 O 2 Br[TeO 3 ] 2  was obtained from a mixture of Yb 2 O 3 , YbBr 3  and TeO 2  in a molar ratio of 2:1:2 along with an excess of KBr as fluxing agent in evacuated fused silica ampoules after 10 days at  T  = 800 °C and subsequent slow cooling to room temperatures as colorless, plate-shaped single crystals. Its triclinic crystal structure ( a  = 663.97(5),  b  = 697.46(5),  c  = 1080.15(8) pm,  α  = 105.102(3),  β  = 90.931(3),  γ  = 100.034(3)°;  Z  = 2, space group:  P1  ‾$&amp;#x203e;{1}$) displays three crystallographically different Yb 3+  cations with coordination numbers of six, seven and eight. Six out of eight distinct oxygen atoms belong to two independent ψ 1 -tetrahedral [TeO 3 ] 2− anions, whereas the other two represent O 2−  anions in tetrahedral coordination of four Yb 3+  cations each, not having any contact to tellurium. Condensed via common vertices and edges, these [OYb 4 ] 10+  tetrahedra form cationic layers∞  2    ${}_{\infty }{}^{2}${[O 2 Yb 3 ] 5+ }, which spread out parallel to the (001) plane. Two discrete [TeO 3 ] 2−  groups and one Br −  anion per formula unit take care of their three-dimensional interconnection along [001] and the overall charge balance of Yb 3 O 2 Br[TeO 3 ] 2 . Remarkable interactions between the lone pair of electrons at the Te 4+  cations of the ψ 1 -tetrahedral [TeO 3 ] 2−  anions and those at the Br −  anions are discussed.

Das Ytterbium(III)-Oxidbromid-Oxidotellurat(IV) Yb 3 O 2 Br[TeO 3 ] 2