Mixed Valence Tungsten (IV,V) Compounds with Layered Structures. Part 4. Syntheses, Crystal Structures, and Conductivity of BiX2[W2O2X6] (X: Cl, Br).

BiCl2[W2O2Cl6] is prepared by reaction of metallic Bi and WOCl4 (sealed silica tube, 650 K, 7 d; 80% yield) and BiBr2[W2O2Br6] is obtained from Bi and WOBr4 (670 K, 50 d; 20% yield).