Darstellung und Eigenschaften von Organoindiumbromiden

Synthesis and Properties of Organoindium Bromides i-Pr₃In gives with InBr₃ (molar ratio 2:1, toluene, 50°C) i-Pr₂InBr ( 1 ) and (molar ratio 1:2, toluene, 80°C) i-PrInBr₂ ( 2 ). The corresponding reaction of (PhCH₂)₃In and InBr₃ (2:1) gives (PhCH₂)₂InBr ( 3 ), while PhCH₂InBr₂ could be isolated only as ether adduct PhCH₂InBr₂(OEt₂)_n] ( 4 ). With DME/MeCN and 2 and 4 with THF, respectively, yields the solvate complexes InBr₃(DME)(MeCN)] ( 5 ), i-PrInBr₂(THF)₂] ( 6 ) and PhCH₂InBr₂(THF)₂] ( 7 ). The compounds 1–7 were investigated with NMR-, IR- and MS-techniques. Pyrolysis of the raw material of i-Pr₃In, which contains “MgBrCl” and additional treatment with Et₂O yields the salt Mg₃Cl_4,65Br_0,35(Et₂O)₆]i-PrInBr_2,7Cl_0,3] ( 8 ). The cation, a trinuclear magnesium complex, possesses local D_3h-symmetric of the Mg₃X₅ backbone (X = Cl, Br).