Europium(III) acetate

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Europium(III) acetate
Names
Other names
Europium acetate
Identifiers
ECHA InfoCard
 100.013.337 Edit this at Wikidata
Properties
Eu(CH3COO)3
Appearance white solid
soluble in water
Related compounds
Other anions
 Europium(III) oxide
Europium(III) hydroxide
Europium(III) carbonate
Other cations
Gadolinium(III) acetate
Related compounds
 Europium(II) acetate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Europium(III) acetate is an inorganic salt of

dimer.[3][4]

Preparation

Europium acetate can be obtained by stirring reaction of acetic acid and europium oxide under heating, and then diluting with water and crystallizing:[5]

Eu2O3 + 6 CH3COOH → 2 Eu(CH3COO)3 + 3 H2O

Europium can also directly participate in the reaction:[1]

2 Eu + 6 CH3COOH → 2 Eu(CH3COO)3 + 3 H2↑

Properties

Physical properties

Structure of europium acetate

The anhydrous europium acetate crystallizes monoclinically in the space group C2/c (space group no. 15) with the lattice parameters a = 1126.0(3), b = 2900.5(6), c = 799.1( 2) pm and β = 132.03(2)° with four formula units per unit cell.[1] The sesquihydrate crystallizes monoclinically in the space group Cc (No. 9) with the lattice parameters a = 1608.7(2), b = 1665.6(2), c = 839.1(1) pm and β = 115.75( 9)° with four formula units per unit cell.[1] The heat capacity at 280 K is 803±16 J/(mol∙K).[6]

Chemical properties

Europium acetate can be dissolved in water, acidified with acetic acid, and the compound of divalent europium [Eu(CH3COO)2(CH3COOH)(H2O)2] can be obtained by electrochemical reduction.[7]

Europium acetate can be crystallized in excess glacial acetic acid to give the salt [Eu(H(CH3COO)2)3](H2O).[1]

Decomposition

Europium acetate can be decomposed by heating, and the hydrate first loses water to obtain anhydrous, and then passes through basic acetate EuOCH3COO, basic carbonate Eu2O2CO3, and finally obtains europium oxide.[8] The tetrahydrate of europium acetate decomposes in air over 6 stages to europium oxide.[8][9]

Stage 1 at 135 °C:

Eu(CH3COO)3·4H2O → Eu(CH3COO)3·H2O + 3H2O

Stage 2 at 170 °C:

Eu(CH3COO)3·3H2O → Eu(CH3COO)3·0.5 H2O + 0.5 H2O

Stage 3 at 210 °C:

Eu(CH3COO)3·0.5H2O → Eu(CH3COO)3 + 0.5 H2O

Stage 4 at 310 °C:

Eu(CH3COO)3 → EuO(CH3COO) + C3H6O + CO2

Stage 5 at 390 °C:

2EuO(CH3COO) → Eu2O2[CO3] + C3H6O

Stage 6 at 670 °C:

Eu2O2[CO3] → Eu2O3 + CO2

Notes

  1. ^ Note: The sesquihydrate of europium(III) acetate has the structure [Eu2(CH3COO)6(H2O)](H2O)2.

References

  1. ^
    ISSN 1521-3749. Retrieved 2019-02-01.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  2. ISSN 0002-7863
    . Retrieved 2019-02-01.
  3. ISSN 0277-5387
    . Retrieved 2019-02-01.
  4. ISSN 0004-9425. Retrieved 2020-01-18.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  5. ^ Tang, Huian; Liu, Yanzhi; Zhao, Aiping. A preparation method of europium acetate [Patent]. CN104387254A. 2015.
  6. S2CID 97590163{{citation}}: CS1 maint: multiple names: authors list (link
    )
  7. ISSN 0277-5387
    . Retrieved 2019-02-01.
  8. ^ a b Ogawa M, Manabe K. Thermal Decomposition of Europium (III) Acetate Tetrahydrate Archived 2019-02-01 at the Wayback Machine（酢酸ユウロピウム(III)4水和物の熱分解）. Journal of the Ceramic Society of Japan, 1988, 96(1117): 890-893.
  9. doi:10.1016/j.jaap.2011.05.004{{citation}}: CS1 maint: multiple names: authors list (link
    )
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