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Makushova G. N. Rare Earth Metal Iminodisuccinates. Izvestiya of Saratov University. New series. Series: Chemistry. Biology. Ecology, 2019, vol. 19, iss. 1, pp. 18-21. DOI: https://doi.org/10.18500/1816-9775-2019-19-1-18-21


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Rare Earth Metal Iminodisuccinates

Abstract

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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