Mössbauer Effect in Iron Pentacarbonyl and Related Carbonyls
| Autor: | Rolfe H. Herber, W. R. Kingston, G. K. Wertheim |
|---|---|
| Rok vydání: | 1963 |
| Předmět: |
Mössbauer effect
Inorganic chemistry Analytical chemistry chemistry.chemical_element Quadrupole splitting Iron pentacarbonyl Inorganic Chemistry Trigonal bipyramidal molecular geometry chemistry.chemical_compound Chromium chemistry Transition metal Oxidation state Mössbauer spectroscopy Physical and Theoretical Chemistry |
| Zdroj: | Inorganic Chemistry. 2:153-158 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic50005a040 |
| Popis: | Four related iron carbonyls, Fe(CO)/sub 5/, Fe/sub 2/(CO)/sub 9/, Fe/sub 3/(CO)/sub 12/, and Fe(CO)/sub 4/I/sub 2/, were used as stationary absorb ers in a Mossbauer experiment in which Co/sup 57/, diffused into metallic chromium, was employed as a source. All four absorbers showed significant resonance absorption of the 14.4-kev gamma -ray of Fe/sup 57/ at 78 deg K. The observed isomer shifts were interpreted in terms of the chemical bonding in transition metal-carbonyl compounds. The two major Mossbauer parameters (isomer shift and quadrupole splitting) in the case of Fe(CO)/sub 5/ and Fe/sub 2/(CO)/sub 9/ were in agreement with a trigonal bipyramid structure and a (3,3,3) structure, respectively. The data for Fe/sub 3/(CO)/sub 12/ strongly suggested the linear (3,3,3,3) structure and could not be accounted for by the trigonal arrangement of the three iron atoms, which was proposed on the basis of x-ray data. The quidrupole splitting for Fe(CO)/sub 4/I/sub 2/ was essentially independent of temperature in the range 78 to 298 deg K, in contrast to the large temperature dependences, which were observed for some related Fe(II) compounds. The isomer shift was consistent with an assignment of 2+ for the oxidation state of iron in this compound. |
| Databáze: | OpenAIRE |
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