Nature of the observed asymmetry in mossbauer spectra of iron (2+) hexacyanometallates (III)

E. Reguera, H. Yee-Madeira, S. Demeshko, G. Eckold, J. Jimenez-Gallegos

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    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-r(H2O)r. Such anisotropic coordination environment could explain the presence of certain vibrational anisotropy detected as asymmetric quadrupole splitting doublets. © by Oldenbourg Wissenschaftsverlag, München.
    Original languageAmerican English
    Pages (from-to)701-711
    Number of pages629
    JournalZeitschrift fur Physikalische Chemie
    StatePublished - 10 Aug 2009

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