Abstract
Several hydrated lanthanide salts of heptafluorobutyric acid have been prepared and characterized. Hydration studies have shown the compounds to exist in various hydration states across the series. Powder X-ray diffraction studies support the existence of variable hydration states in that three distinct crystalline forms exist. Infrared analysis revealed two types of structures to be present. Upon dehydration of the lighter rare earth hydrates to intermediate dihydrates, all of the compounds showed similar structures. Decomposition was found to be exothermic. The volatile decomposition products were identified by infrared analysis and found to consist of CO, CO 2, CF 3CF 2COF and CF 3CF 2CF 2COF. The amounts of each gas were found to be dependent on the decomposition temperature. The non-volatile decomposition products were identified by powder X-ray diffraction and found to consist of LnF 3, LnOF and Ln 2O 3.
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