Nature of the Observed Asymmetry in Mossbauer Spectra of Iron (2+) Hexacyanometallates (III)

The material under study belongs to the Prussian blue analogues family. which arc 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. Mossbauer spectroscopy is a powerful tool to obtain structural information on the local environment for the iron nucleus in these materials. Mossbauer 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 (tie 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)(H(2)O)(x). Such anisotropic coordination environment could explain the presence of certain vibrational anisotropy detected as asymmetric quadrupole splitting doublets.