Rare Earth Metal Iminodisuccinates
Iminodisuccinates of several rare earth metals (REM) have been synthesized as a result of reaction between freshly prepared ammonia iminodisuccinate and REM chloride soltuions at pH 3. According to element analysis data, the chemical composition of synthesized salts is MeHC8H7O8N · nH2O, where Ме = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, n = 1–5. Synthesized compounds were further analyzed via X-ray diffraction and thermogravimetric analysis. According to X-ray data, REM iminodissucinates form well-defined crystals in two distinct isostructural groups. Thermal decomposition of such compounds have two stages – dehydration and decomposition of anhydrous to corresponding REM oxides. The composition of final production of thermal decomposition is proved by X-ray crystallographic data. Solubility of synthesized compounds in water within the temperature range of 25–60 °C has also been studied. Iminodisuccinates have low water solubility that may vary depending on the nature of REM ion and temperature.
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