| Autor: |
Piepho, S. B., Inskeep, W. H., Schatz, P. N., Preetz, W., Homborg, H. |
| Zdroj: |
Molecular Physics; November 1975, Vol. 30 Issue: 5 p1569-1588, 20p |
| Abstrakt: |
The absorption and magnetic circular dichroism (MCD) spectra of the n-tetrabutylammonium salts of OsI62- and trans-IrCl4Br22-, OsCl4Br22- and OsBr4Cl22- and of the trans-tetraethylammonium salts of IrBr4Cl22-, OsCl4I22-, and OsI4Cl22- were measured in KBr pellets at liquid helium temperature. The bands in the absorption spectra, which are very similar for analogous Ir4+ and Os4+ mixed halides, are assigned with the help of MCD data to ligand-to-metal charge-transfer transitions using the j-j model previously found successful in interpreting the OsCl62- and OsBr62- spectra. The signs and, where possible, the magnitudes of the tetragonal distortion parameters are estimated for these mixed halides by fitting the spectra, and the signs are compared with those predicted by simple molecular orbital arguments. The principal bands of OsI62- are assigned to charge-transfer transitions which correspond to the analogous ones in OsBr62- and OsCl62-. The importance of second-order ligand spin-orbit coupling is demonstrated. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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