Die Bromokomplexe von Molybdän(IV) [MoBr6]2⊖ und [Mo2Br10]2⊖. Die Kristallstruktur von (PPh3Me)2[MoBr6] · 2 CH2Br2

Bromo Complexes of Molybdenum(IV) MoBr₆]^2? and Mo₂Br₁₀]^2?. Crystal Structure of (PPh₃Me)₂MoBr₆] · 2 CH₂Br₂ The bromomolybdates(IV) (PPh₃Me)₂MoBr₆] · 2 CH₂Br₂ and (PPh₄)₂Mo₂Br₁₀] are obtained by reactions of molybdenum tetrabromide with PPh₃MeBr and PPh₄Br, respectively. They form black-brown, hydrolysis sensitive crystal powders. The crystal structure of (PPh₃Me)₂MoBr₆] · 2 CH₂Br₂ was determined by X-ray diffraction (2376 independent observed reflexions, R = 0.082). Crystal data: a = 1024, b = 1131, c = 1179 pm, α = 108.2°, β = 106.8°, γ = 99.0°, space group P1 , Z = 1. The compound consists of PPh₃Me⁺ ions, CH₂Br₂ molecules and nearly octahedral MoBr₆]^2? ions with MoBr bond lengths between 252.7 and 254.0 pm.