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Pale bluish-green single crystals of the new compound CuTb2[B8O16] have been obtained by a B2O3 flux technique. They crystallize in an unknown structure type. X-ray investigations on single crystals led to the space group C52h-P21/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∞[B8O16]8- chains isolated from each other, which include tri- and tetracoordinated boron. The chains consist of alternating twelve- anddoi:10.1515/znb-1995-0512 fatcat:capiuadzkrhnnd2wlzqenrvc2e