| Abstract: | Hydrolysis and Halide Exchange of Pentahalogenomonocarbonyl Osmates(III) The aquo complexes [OsX4(CO)(H2O)]?, [OsX3(CO)(H2O)] and [OsX2(CO)(H2O)3]+, X ? Cl, Br, I, produced by the stepwise hydrolysis of [OsX5(CO)]2?, are isolated as pure solutions by ionophoresis and characterized by their absorption spectra. Due to stability of the monaquo complexes and the different trans-effect of the halides it is possible to prepare the mixed complexes [OsX4–nYn(CO)(H2O)]?, X ≠ Y = Cl, Br, I, n = 1–3, and for n = 2 the pure stereoisomers are formed. A systematic shift is found in charge-transfer bands to the shorter wavelengths when the halides are replaced by H2O, I by Br or Cl and Br by Cl. |
