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Single crystals of the compound CuTm 2 [B 2 O 3 ] 2  were obtained by a B 2 O 3  flux technique. The compound contains a hitherto unknown metaborate anion with the formula  2  ∞ [B 2 O 5 ] 4- . It crystallizes in the monoclinic space group C 5  2h  - P2 1 /c with a = 452.18(7); b = 720.0(2); c = 929.2(5) pm; β = 90.16(5)°; Z = 2. The metaborate layers consists of four and eight membered rings of edge-sharing BO 4 -tetrahedra resembling the complex anion in the isotypic gadolinite structure of FeY 2 [BeSiO 3 ] 2 . The layers are connected via copper-centered elongated oxygen octahedra and slightly distorted thulium-centered tetragonal oxygen antiprisms.

zeitschrift für naturforschung b

CuTm 2 [B 2 O 5 ] 2 : Das erste „Metaborat“ mit einem  2  ∞ [B 2 O 5 ] 4-  -Anion / CuTm 2 [B 2 O 5 ] 2 : The First “ Metaborate” with a  2  ∞ [B 2 O 5 ] 4-  -Anion