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The IR and Raman spectra of the ten bromo-iodo-osmates(IV) [OsBr n I 6-n ] 2- , n = 0-6, including the geometrical isomers for n = 2, 3, 4, have been recorded at low temperature. The vibrational spectra are completely assigned according to point groups O h , D 4h , C 4v , C 3v , and C 2v , as supported by normal coordinate analyses based on a general valence force field. Due to the different trans-influences Br&amp;lt;I in asymmetric axes Br′–Os–I′, the Os–I′ bonds are strengthened and the Os–Br′ bonds are weakened, as indicated by valence force constants, for Os–I′ on average 4% higher and for Os–Br′ 4% lower, as compared with the values calculated for symmetric I–Os–I and Br–Os–Br axes, respectively.

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Schwingungsspektren und Normalkoordinatenanalyse der Bromo-Iodo-Osmate(IV), [OsBr n I 6-n ] 2- , n = 0-6 / Vibrational Spectra and Normal Coordinate Analysis of Bromo-Iodo-Osmates(IV), [OsBr n I 6-n ] 2- , n = 0-6