Thermogravimetric analysis permits the isolation of four groups of dibenzoylmethanates of the REE, differing in temperature of dehydration and nature of the thermogravigrams. The temperature of dehydration increases in the series from Lu to La, which corresponds to the extrasphere accommodation of the hydrate water.
The data of thermogravimetric, chemical, and IR-spectroscopic analyses show that the dehydration of complexes of the light rare earth elements is accompanied by hydrolysis. Hydrolysis in the dibenzoylmethanates only of the light lanthanides is explained by a structural rearrangement of the hydrated complexes, in which the extrasphere water molecules enter the inner sphere and produce hydrolysis of the complex.
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Murav'eva, I.A., Denliev, N., Khalmurzaev, N.K. et al. Study of the thermal stability of crystal hydrates of dibenzoylmethanates of the rare earth metals. Russ Chem Bull 24, 1161–1164 (1975). https://doi.org/10.1007/BF00922038
- Water Molecule
- Thermal Stability