Abstract
Isomer shift (IS) and electric quadrupole splitting (QS) of the 77 keV γ-rays of Au197 were investigated for a large number of Au (I) and Au (III) compounds at 4.2 °K by nuclear γ-resonance Spectroscopy. A close correlation between the observed isomer shifts and the spectrochemical series of the ligands was observed. For each oxidation state, isomer shift and electric quadrupole splitting show approximately a linear relationship. On the basis of LCAO-MO theory, the experimental results are interpreted by covalency effects in the molecular orbitals, synergic coupling of σ- and π-bonds, and the empirically known donor and acceptor properties of the ligands.
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We should like to thank Dr. Ursel Zahn, Dr. H. Eicher and Dr. D. Fischer, München, for many valuable discussions and suggestions. We are further indebted to Prof. R. Hoppe and Dr. Wasel-Nielen, Univ. Gießen, for the preparation of the tetrafluorides and the oxides Li3AuO3 and Na3AuO3, Prof. R. Hüttel and Dr. Konietzny, Univ. München, for the preparation of the olefin complexes and the C12H10N2AuCl3, and Prof. W. Beck and Dr. Burger, Univ. München, for the preparation of the azido and azolato complexes.
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Bartunik, H.D., Potzel, W., Mössbauer, R.L. et al. Resonance spectroscopy of γ-radiation on Au (I) and Au (III) compounds. Z. Physik 240, 1–16 (1970). https://doi.org/10.1007/BF01400165
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DOI: https://doi.org/10.1007/BF01400165