Abstract

Single crystals of distrontium(II) dicopper(II) tellurium(VI) hexaoxide dibromide, Sr2Cu2TeO6Br2, were synthesized via solid state/gas phase reactions in sealed evacuated silica tubes. The building units are irregular SrO4Br3 polyhedra (a new type of coordination polyhedron around Sr(II)), CuO5 square pyramids and TeO6 octahedra. The CuO5 square pyramids and the TeO6 octahedra together form layers in the bc plane bridged by Sr atoms. The Cu atoms are arranged to form puckered honeycomb layers. The Te atom lies on an inversion centre.

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