Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract The thermal behaviour of substituted pentacyanoferrates(II) of the type Na3[Fe(CN5)L]·xH2O, whereL=n-, sec-, tert- oriso-butylamine,di-iso-butylamine ortri-n-butylamine, was investigated with the aid of Mössbauer spectroscopy, XRD and TG-DTG-DTA. The Mössbauer spectra of these complexes exhibit a quadrupole doublet with ΔE Q=0.70−0.83 mm s−1 at room temperature. The isomer shift, δ=0.00±0.03 mm s−1 suggests that the iron atom is in the +2 low-spin state. The complexes start to decompose at 50°C, yielding a residual mass of 5.8 –21.3% in the temperature range 900–950°C. The Mössbauer spectra recorded after heating at 150 and 300°C exhibit an asymmetric doublet, suggesting partial decomposition. The Mössbauer spectra at higher temperature are complex. At different stages of the thermal process, the presence of α-Fe2O3, γ-Fe2O3, α-Fe, Fe3C and Fe3O4 was demonstrated.
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