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Praseodymium(III) carbonate

Praseodymium(III) carbonate is an inorganic compound, with a chemical formula of Pr<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>. The anhydrous form is olive green, and many of its hydrates such as heptahydrate and octahydrate are known. They are all insoluble in water.

Preparation

Praseodymium(III) carbonate can be obtained by the hydrolysis of praseodymium(III) chloroacetate:

2 Pr(C<sub>2</sub>Cl<sub>3</sub>O<sub>2</sub>)<sub>3</sub> + 3 H<sub>2</sub>O → Pr<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> + 6 CHCl<sub>3</sub> + 3 CO<sub>2</sub>

It can also be obtained by reacting sodium bicarbonate saturated with carbon dioxide with a praseodymium chloride solution.

Chemical properties

Praseodymium(III) carbonate is soluble in acids, and emits carbon dioxide:

Pr<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> + 6 H<sup>+</sup> → 2 Pr<sup>3+</sup> + 3 H<sub>2</sub>O + 3 CO<sub>2</sub>↑

However, it is insoluble in water.

Other compounds

Praseodymium(III) carbonate forms compounds with N<sub>2</sub>H<sub>4</sub>, such as Pr<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>•12N<sub>2</sub>H<sub>4</sub>•5H<sub>2</sub>O which is a pale green crystal that is slightly soluble in water but insoluble in benzene, with d20°C = 1.873 g/cm<sup>3</sup>.

References