2D‐Polymeric Anion Networks: The Two Novel Perselenoborates BaB₂Se₆ and Ba₂B₄Se₁₃.

Abstract

structure structure (solids and liquids) D 2000 -0082D-Polymeric Anion Networks: The Two Novel Perselenoborates BaB 2 Se 6 and Ba 2 B 4 Se 13 .-The new title compounds are prepared by reaction of appropriate amounts of barium selenide, boron, and sulfur (evacuated graphite-coated quartz tube, 1020 K, 4 h; controlled cooling). BaB 2 Se 6 crystallizes in the orthorhombic space group Cmca (Z = 4) and Ba 2 B 4 Se 13 is monoclinic, space group P2 1 /c (Z = 4), as determined by single crystal XRD. BaB 2 Se 6 contains infinite ∞ 2 [B 2 Se 6 2− ] layers formed by B 2 Se 2 four-membered rings which are connected via four diselenide bridges. This connectivity leads to B 6 Se 12 rings in which the Ba 2+ ions are located. In Ba 2 B 4 Se 13 polymeric ∞ 2 [B 4 Se 13 2− ] anions are formed by alternating B 2 Se 4 -and B 2 Se 3 -rings which are connected by perseleno bridges. -(HAMMERSCHMIDT, A.; LINDE-MANN, A.; DOECH, M.; KOESTER, C.; KREBS, B.