ChemInform Abstract: CuDy₂[B₈O₁₆] and CuHo₂[B₈O₁₆]: Two New “Metaborates” with a _∞¹[B₈O₁₆]^8‐ Anion.

Abstract

CuDy 2 [B 8 O 16 ] and CuHo 2 [B 8 O 16 ]: Two New "Metaborates" with a ∞ 1 [B 8 O 16 ] 8− Anion. -Single crystals of the title compounds CuDy 2 [B 8 O 16 ] (IVa) and CuHo 2 [B 8 O 16 ] (IVb) are obtained by annealing the element oxides at 1030-1060 • C. Compound (IVa) appears to be isotypic to the monoclinic crystal structure of CuTb 2 [B 8 O 16 ], while compound (IVb) represents an orthorhombic variant. Single crystal X-ray studies reveal space group P2 1 /c with Z = 2 for (IVa) and Pbam, Z = 2 for (IVb). The structures contain 1 [B 8 O 16 ] 8− chains isolated from each other, which include tri-and tetracoordinated boron. The chains consist of alternating 12-and 8-membered rings of boron and oxygen atoms connected by BO 4 units. -(WIESCH, A.; TIMM, H.; BLUHM, K.