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Pale bluish-green single crystals of the new compound CuTb 2 [B 8 O 16 ] have been obtained by a B 2 O 3  flux technique. They crystallize in an unknown structure type. X-ray investigations on single crystals led to the space group C 5  2h -P2 1 /c (Nr. 14) with lattice parameters a = 1024.6(1); b = 834.93(6); c = 622.87(6) pm , β = 90.45(2)°; Z = 2. The structure contains  1  ∞ [B 8 O 16 ] 8-  chains isolated from each other, which include tri- and tetracoordinated boron. The chains consist of alternating twelve- and eight-membered rings of boron and oxygen connected by BO 4  units. Tb 3+  is octacoordinated and Cu 2+  is hexacoordinated in elongated octahedra by oxygen. The relation to the crystal structures of Tb[B 3 O 6 ] and CuTb[B 5 O 10 ] is pointed out.

zeitschrift für naturforschung b

CuTb 2 [B 8 O 16 ]: Das erste „Metaborat“ mit einem  1  ∞ [B 8 O 16 ] 8- -Anion / CuTb 2 [B 8 O 16 ]: The First “Metaborate” with a  1  ∞ [B 8 O 16 ] 8-  Anion