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In the reaction of K 2 [OsX 3  Y 3 ] with boiling water/acetylacetone (1:1) the six mixed com­plexes cis-and trans-[OsX 2  (acac) 2 ] (X ≠ Y = Cl, Br, I) are formed, which have been purified by column chromatography with toluene on silica gel. The IR and Raman spectra (10K) show the intraligand vibrations of the acac groups with nearly constant frequencies and the stretching vibrations of OsO in the range 460-696, of OsCl at 315-345, of OsBr at 210-225, and of Osl at 160-175 cm -1  . A normal coordinate analysis based on a modified valence force field was performed for trans-[OsClBr(acac) 2 ] and the vibrational modes have been assigned. With a set of 32 force constants, taking into account the intraligand vibrations, a good agreement between observed and calculated frequencies has been achieved. The valence force constants are f d  (OsCl • ) = 1.75, f d (OsBr′) = 1.63 and f d  (OsO) = 3.27 mdyn/Å.

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Darstellung und Schwingungsspektren von cis- und trans-[OsXY(acac) 2 ], X ≠ Y = Cl, Br, I sowie Normalkoordinatenanalyse von trans-[OsClBr(acac) 2 ]/Synthesis and Vibrational Spectra of cis- and trans-[OsXY(acac) 2 ], X ≠ Y = Cl, Br, I, and Normal Coordinate Analysis of trans-[OsClBr(acac) 2 ]