Schwingungs-Raman-Spektren von Hexahalogenokomplexen von OsIV (X = Cl,I) und IrIV (X = Cl,Br) bei 80 K |
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Authors: | H Homborg |
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Abstract: | Vibrational Raman Spectra of Hexahalo Complexes of OsIV (X = Cl, I) and IrIV (X = Cl, Br) at 80 K The Resonance-Raman (RR) spectra of the tetrabutyl- resp. tetraethylammonium salts of OsCl6]2?, OsI6]2?, IrCl6]2?, and IrBr6]2? have been investigated with the excitation-lines of an Ar+ and Kr+ laser. Devices with a movable sample holder for low-temperature experiments (80 K) are described. The anormal intensities of some of the Ra-active fundamentals are attributed to the RR effect. As a rule the deformation vibration υ5(T2g) is RR enhanced if excited within a π—π*(dt2g)-CT-transition and the stretching vibration υ2(Eg) is RR-enhanced within a π—σ*(deg)-CT-transition. The dispersion of the degree of depolarisation of the three Ra-active fundamentals of IrBr6]2? demonstrates, that this rule cannot only be applicated to the symmetrical but also to the antisymmetrical part of the scattering tensor. |
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