Europium (III) acetate

Crystal structure
	No drawing available
General
Surname	Europium (III) acetate
other names	Europium (III) acetate
Ratio formula	Eu (CH 3 COO) 3 ; Eu (CH 3 COO) 3 · 1.5H 2 O; Eu (CH 3 COO) 3 • 4H 2 O;
Brief description	colorless crystals
External identifiers / databases
EC number	214-670-9
ECHA InfoCard	100.013.337
PubChem	164792
ChemSpider	144466
Wikidata	Q65046240
properties
Molar mass	329.096 g mol −1 (anhydrous); 356.119 g mol −1 (sesquihydrate); 401.156 g mol −1 (tetrahydrate);
Physical state	firmly
density	2.255 g cm −3 (anhydrous); 2.336 g cm −3 (sesquihydrate);
solubility	soluble in water
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Europium (III) acetate (Eu (CH ₃ COO) ₃ ) is a salt made from acetic acid and europium . It occurs as anhydrate (Eu (CH ₃ COO) ₃ ), sesquihydrate (Eu (CH ₃ COO) ₃ ∙ 1.5H ₂ O) and as tetrahydrate Eu (CH ₃ COO) ₃ ∙ 4H ₂ O. A europium (II) acetate (Eu (CH ₃ COO) ₂ ) is also known.

Extraction and presentation

Europium (III) acetate can be obtained by reacting acetic acid and europium metal at 130 ° C in an evacuated silica glass ampoule .

{\ displaystyle {\ ce {2 Eu + 6 CH3COOH -> 2 Eu (CH3COO) 3 + 3 H2}}}

In this case, oxidized europium and the hydrogen is reduced .

properties

The tetrahydrate decomposes in air in 6 steps to form europium (III) oxide .

1st stage at 135 ° C

{\ displaystyle {\ ce {Eu (CH3COO) 3 * 4H2O -> Eu (CH3COO) 3 * H2O + 3 H2O}}}

2nd stage at 170 ° C

{\ displaystyle {\ ce {Eu (CH3COO) 3 * H2O -> Eu (CH3COO) 3 * 0.5H2O + 0.5 H2O}}}

3rd stage at 210 ° C

{\ displaystyle {\ ce {Eu (CH3COO) 3 * 0.5H2O -> Eu (CH3COO) 3 + 0.5 H2O}}}

4th stage at 310 ° C

{\ displaystyle {\ ce {Eu (CH3COO) 3 -> EuO (CH3COO) + C3H6O + CO2}}}

5th stage at 390 ° C

{\ displaystyle {\ ce {2 EuO (CH3COO) -> Eu2O2 [CO3] + C3H6O}}}

6th stage at 670 ° C

{\ displaystyle {\ ce {Eu2O2 [CO3] -> Eu2O3 + CO2}}}

The anhydrous europium (III) acetate crystallizes monoclinically in the space group C 2 / 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 . 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. The heat capacity at 280 K is 803 ± 16 J / ( mol ∙ K). Template: room group / 15Template: room group / 9

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h S. Gomez Torres, I. Pantenburg, G. Meyer: Direct Oxidation of Europium Metal with Acetic Acid: Anhydrous Europium (III) Acetate, Eu (OAc) ₃ , its Sesqui-hydrate, Eu (OAc) ₃ (H ₂ O) 1.5, and the “Hydrogendiacetate”, [Eu (H (OAc) ₂ ) ₃ ] (H ₂ O) . In: Z. Anorg. General Chem. Band 632 , 2006, pp. 1989-1994 , doi : 10.1002 / zaac.200600154 .
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
^ HN McCoy: The Salts of Europium . In: J. Am. Chem. Soc. tape 61 , 1939, pp. 2455–2456 , doi : 10.1021 / ja01878a055 .
↑ P. Starynowicz: Synthesis and crystal structure of europium (II) diacetate hemihydrate, Eu (CH ₃ COO) ₂∙ 0.5 (H ₂ O) . In: Journal of Alloys and Compounds . tape 268 , 1998, pp. 47-49 , doi : 10.1016 / S0925-8388 (97) 00596-3 .
↑ M. Ogawa, K. Manabe: Thermal Decompostion of Europium (III) Acetate Tetrahydrate . In: Journal of the Ceramic Society of Japan . tape 96 , no. 9 , 1988, pp. 890-893 , doi : 10.2109 / jcersj.96.890 .
↑ Balboul, Basma AA; Zaki, Mohamed I: Thermal decomposition course of Eu (CH ₃ COO) ₃ · 4H ₂ O and the reactivity at the gas / solid interface thus established . In: Journal of Analytical and Applied Pyrolysis . tape 92 , no. 1 , 2011, p. 137-142 , doi : 10.1016 / j.jaap.2011.05.004 .
↑ Dobrokhotova, Zh. V .; Fomina, IG; Kiskin, MA; Bykov, MA; Belov, GV; Novotortsev, VM: The thermodynamic properties of rare-earth metal binuclear acetates and pivalates . In: Russian Journal of Physical Chemistry . tape 80 , no. 3 , 2006, ISSN 0036-0244 , p. 323-329 , doi : 10.1134 / S0036024406030034 .

[:0-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h S. Gomez Torres, I. Pantenburg, G. Meyer: Direct Oxidation of Europium Metal with Acetic Acid: Anhydrous Europium (III) Acetate, Eu (OAc) ₃ , its Sesqui-hydrate, Eu (OAc) ₃ (H ₂ O) 1.5, and the “Hydrogendiacetate”, [Eu (H (OAc) ₂ ) ₃ ] (H ₂ O) . In: Z. Anorg. General Chem. Band 632 , 2006, pp. 1989-1994 , doi : 10.1002 / zaac.200600154 .

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[3] HN McCoy: The Salts of Europium . In: J. Am. Chem. Soc. tape 61 , 1939, pp. 2455–2456 , doi : 10.1021 / ja01878a055 .

[4] P. Starynowicz: Synthesis and crystal structure of europium (II) diacetate hemihydrate, Eu (CH ₃ COO) ₂∙ 0.5 (H ₂ O) . In: Journal of Alloys and Compounds . tape 268 , 1998, pp. 47-49 , doi : 10.1016 / S0925-8388 (97) 00596-3 .

[5] M. Ogawa, K. Manabe: Thermal Decompostion of Europium (III) Acetate Tetrahydrate . In: Journal of the Ceramic Society of Japan . tape 96 , no. 9 , 1988, pp. 890-893 , doi : 10.2109 / jcersj.96.890 .

[6] Balboul, Basma AA; Zaki, Mohamed I: Thermal decomposition course of Eu (CH ₃ COO) ₃ · 4H ₂ O and the reactivity at the gas / solid interface thus established . In: Journal of Analytical and Applied Pyrolysis . tape 92 , no. 1 , 2011, p. 137-142 , doi : 10.1016 / j.jaap.2011.05.004 .

[7] Dobrokhotova, Zh. V .; Fomina, IG; Kiskin, MA; Bykov, MA; Belov, GV; Novotortsev, VM: The thermodynamic properties of rare-earth metal binuclear acetates and pivalates . In: Russian Journal of Physical Chemistry . tape 80 , no. 3 , 2006, ISSN 0036-0244 , p. 323-329 , doi : 10.1134 / S0036024406030034 .