Abstract
Ammonium pentafluorometallate monohydrates were prepared by different methods and characterized by chemical analysis, IR spectrometry and X-ray diffraction. Unit cell parameters were determined for the Fe and Cr compounds, which were found to be isostructural with the known Al compound. The IR spectra, X-ray diffraction patterns and lattice data on the compounds are very similar, and point to the existence of isolated [MIIIF5(H2O)]2− octahedra. The water is coordinated to theM III cation.Dehydration and thermal decomposition were investigated by thermal analysis (TG, DTG, DTA) on the Q-derivatograph and by high-temperature X-ray diffraction. Different dehydration temperatures and products were found, depending on the nature of theM III cation. NH4F is liberated in several steps (Al or Fe) or continuously (Cr), leading to the formation ofM III fluorides.
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