Europium(II) hydroxide is an

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...

, with the chemical formula of Eu(OH)₂. It can exist as the dihydrate Eu(OH)₂·H₂O.

Preparation

The monohydrate of europium(II) hydroxide can be obtained by the reaction of metal

europium Europium is a chemical element with the symbol Eu and atomic number 63. Europium is the most reactive lanthanide by far, having to be stored under an inert fluid to protect it from atmospheric oxygen or moisture. Europium is also the softest lanth ...

and 10 mol/L

sodium hydroxide Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations and hydroxide anions . Sodium hydroxide is a highly caustic base and alkali ...

solution. There are some sources that use

europium(III) chloride Europium(III) chloride is an inorganic compound with the formula EuCl3. The anhydrous compound is a yellow solid. Being hygroscopic it rapidly absorbs water to form a white crystalline water of crystallization, hexahydrate, EuCl3·6H2O, which is ...

as a raw material, and prepare it by reacting the

Jones reductor A Jones reductor is a device used to reduce aqueous solutions of metal ions. The active component is a zinc amalgam. Jones reductors have been used for preparing solutions of titanium(III), vanadium(II), chromium(II), molybdenum(III), niobium(III), ...

with

solution.

Properties

Europium(II) hydroxide belongs to the

orthorhombic crystal system In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...

, a=6.701 ± 0.002, b=6.197 ± 0.002, c=3.652 ± 0.001 A. It thermally decomposes to form

europium(II) oxide Europium(II) oxide (EuO) is a chemical compound which is one of the oxides of europium. In addition to europium(II) oxide, there is also europium(III) oxide and the mixed valence europium(II,III) oxide. Preparation Europium(II) oxide can be prepa ...

(EuO); it is readily oxidized to

europium(III) hydroxide Europium(III) hydroxide is an inorganic compound with a chemical formula Eu(OH)3. Chemical properties Europium(III) hydroxide can be prepared by reacting metallic europium with water. It reacts with acids In computer science, ACID ( atomicity, ...

in air.无机化学丛书第七卷钪稀土元素. 科学出版社. pp 202, 204-205

References

{{Hydroxides Europium(II) compounds Hydroxides