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http://repositoriodigital.ipn.mx/handle/123456789/11018| Título : | Nature of the Observed Asymmetry in Mössbauer Spectra of Iron (2+) Hexacyanometallates (III) |
| Fecha de publicación : | 16-ene-2013 |
| Editorial : | Z. Phys. Chem. |
| Descripción : | The material under study belongs to the Prussian blue analogues family, which are coordination compounds with a porous framework appropriate for the storage of small molecules, among them hydrogen. The porous framework results from systematic vacancies for the octahedral building block, [M(CN)6], in a 3D structure. Mössbauer spectroscopy is a powerful tool to obtain structural information on the local environment for the iron nucleus in these materials. Mössbauer spectra of iron (2+) hexacyanometallates (III) show two slightly asymmetric quadrupole splitting doublets. These two doublets correspond to two non-equivalent structural sites for the iron atom in the framework related with a non-random vacancy distribution. The observed asymmetry was ascribed to a vibrational anisotropy for these iron sites. The asymmetry decreases on the sample cooling and for 7 K it practically disappears. The iron atom is found at the cavities surface with a mixed coordination sphere, Fe(NC)6–x(H2O)x. Such anisotropic coordination environment could explain the presence of certain vibrational anisotropy detected as asymmetric quadrupole splitting doublets. |
| URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/11018 |
| Otros identificadores : | Z. Phys. Chem. 223 (2009) 701–711 http://hdl.handle.net/123456789/531 |
| Aparece en las colecciones: | Doctorado |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| 2009MossbCoIIIFeII 1.pdf | 44.21 kB | Adobe PDF | Visualizar/Abrir |
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