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Normal coordinate analyses for all compounds of the series [MX n Y 6-1 ] z- , M = Ru, Rh, Os, Ir, Pt; Χ ≠ Y = F, Cl, Br; n = 0-6; z = 1-3, including the geometric isomers for n = 2, 3, 4 have been performed, based on a general valence force field. For the isostructural species of the point symmetries O h  (n = 0, 6), D 4h  (2,4, trans), C 4v  (1, 5), C 3v  (3, fac), C 2v  (2,4, cis; 3, mer) sequences of decreasing frequencies are established. Due to the different trans influences X &amp;lt; Y (F &amp;lt; Cl &amp;lt; Br) in asymmetric axes X′–M–Y′, the M–Y′ bonds are strengthened and the M – X′ bonds are weakened, as indicated by valence force constants for M – Y′ up to 21 % higher (Pt–Cl′), for M–X′ down to 18% lower (Pt–F′), as compared with the values calculated for symmetrical X–M–X and Y–M–Y axes, respectively. The influence of the different central ions and their oxidation numbers on the force field is discussed.

zeitschrift für naturforschung b

Normalkoordinatenanalyse an Oktaederkomplexen des Typs [MX n Y 6-n ] z- , M = Ru, Rh, Os, Ir, Pt; Χ ≠ Y = F, Cl, Br; n = 0-6; z = 1 -3 / Normal Coordinate Analysis on Octahedral Complexes of the Type [ΜΧ n Υ 6-n ] z- , M = Ru, Rh, Os, Ir, Pt; Χ ≠ Y = F, Cl, Br; n = 0-6; z = 1-3