Chemical Applications of the Mössbauer Effect in Ruthenium Compounds
The great utility of the Mössbauer effect in the solution of chemical problems, especially those involving iron and tin compounds, lends impetus to the exploration of its usefulness in other chemical systems. The Mössbauer effect for the 90-keV transition of 99Ru, first reported by Kistner , appears to be a unique chemical probe. The experimental difficulties are much greater than those encountered in iron and tin work since the source and absorber must be cooled to liquid helium temperatures and very large absorber thicknesses must be used. However, the results reported here and those reported by Mössbauer and co-workers , indicate that the isomer shift and the quadrupole splitting in ruthenium compounds can be related to the structure and bonding in the molecules. A correlation between the isomer shift and the oxidation state of the ruthenium (or the number of 4d electrons) can be made and compared with similar results for iron compounds. Also, the isomer shifts can be correlated with the total charge density at the ruthenium nucleus as calculated by restricted Hartree-Fock wave functions of the s-electron density at the nucleus for specific oxidation states. The large variety of known ruthenium compounds in several different oxidation states makes this system ideal for the systematic evaluation of Mössbauer parameters in chemical terms.
KeywordsIsomer Shift Quadrupole Splitting Liquid Helium Temperature Mossbauer Spectrum Ruthenium Atom
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