Ba3P3I2 und Ba5P5I3: Stufenweise Oxidation von Bariumphosphid mit Iod

Ba₃P₃I₂ and Ba₅P₅I₃: Stepwise Oxidation of Barium Phosphide with Iodine The novel compounds Ba₃P₃I₂ and Ba₅P₅I₃ were obtained by the reaction of barium phosphide with iodine. The air and moisture sensitive compounds crystallize in new structure types: Ba₃P₃I₂ (oP32; Pnma; a = 1719.5(4) pm; b = 462.4(2) pm; c = 1427.2(4) pm; Z = 4; R(F)_N′ = 0.067 (N′(hkl) = 2667), Ba₅P₅I₃ (mC52; C2/m; a = 4266.4(13) pm; b = 456.3(2) pm; c = 943.1(3) pm; ß = 92.20(3)°; Z = 4; R(F)_N′ = 0.040 (N′(hkl) = 3909). Both can be described as double salts of a hypothetic Zintl Phase ('Ba₂P₃' or 'Ba₇P₁₀') and a halide (BaI₂). Characteristic structural features are P₃ and P₄ chains, corresponding to Ba₃P₃]I₂ and Ba₁₀P₃]₂P₄]I₆, respectively. The bonding characteristics will be interpreted on the basis of the structure and the physical properties.