Ba2CoCl6: Synthese,Kristallstruktur und spektroskopische Eigenschaften

Ba₂CoCl₆: Synthesis, Crystal Structure, and Spectroscopic Properties Single crystals of Ba₂CoCl₆ were obtained from the binary chlorides BaCl₂ and CoCl₂ in sealed silica ampoules applying the Bridgman technique. According to the X‐ray single crystal structure determination, Ba₂CoCl₆ crystallizes with the monoclinic crystal system (P2₁/n, Z = 4, a = 914.1(1), b = 811.4(1), c = 1279.7(2) pm, β = 90.22(2)°). The structure contains conedgial double octahedra, [Co₂Cl₁₀]^6–, and extra Cl^– anions. These are connected via nine‐coordinate Ba²⁺ cations. Investigations of the absorption properties of the blue Ba₂CoCl₆ show a high‐spin ground state. The absorption spectrum is comparable to that of CoCl₂.