After effects of the cobalt-57-iron-57 electron-capture reaction in cobalt-57-doped tricadmium bis[hexacyanoferrate(III)] dodecahydrate

Mössbauer-emission spectra of cobalt-57-doped Cd3[Fe(CN)6]2, 12H2O have been recorded at various temperatures and resolved into two doublets, one symmetric for the parent [Fe(CN)6]3– and one asymmetric attributed to a square-pyradimal [Fe(CN)5]2– complex. The asymmetry vanishes with increasing temperature and thus cannot be attributed to a Goldanskii–Karyagin effect. The possibilities of paramagnetic relaxation are briefly discussed.