Vaporization characteristics of ammonium tetrachloroferrate(III). The monoammine of iron(III) chloride in the vapor phase

Article abstract of DOI:10.1021/ic50225a017

The behavior of NH₄FeCl₄ on heating is found to be complex. The iron(III) tends to be reduced by ammonia; however as HCl, a product of the reduction reaction, accumulates, the system stabilizes sufficiently to permit the study of vaporization equilibria. Absorption spectroscopy, mass spectrometery, and diaphragm gauge measurement of total pressures have been used to determine the composition of the vapor phase, and thermodynamic data for the reactions NH₄FeCl₄(C) = NH₃FeCl₃(g) + HCl(g) and NH₄FeCl₃(C) = FeCl₂(s) + NH₃(g) + HCl(g) are reported. The UV-visible absorption spectrum of NH₃FeCl₃ between 240 and 500 nm is given.