Europium (II) oxalate

Crystal structure
	No drawing available
General
Surname	Europium (II) oxalate
Ratio formula	Eu (C 2 O 4 )
Brief description	red-brown solid
External identifiers / databases
Wikidata	Q83875273
properties
Molar mass	239.983 g mol −1 (anhydrous); 257.998 g mol −1 (monohydrate);
Physical state	firmly
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 (II) oxalate (Eu (C ₂ O ₄ )) is a reddish brown-resistant chemical compound of europium and of the oxalate - anion . It occurs as a monohydrate as well as an anhydrous compound.

Extraction and presentation

The pure representation takes place via the conversion of EuSO ₄ with ammonium oxalate .

{\ displaystyle {\ ce {EuSO4 + (NH4) 2C2O4 + H2O -> EuC2O4 * H2O + (NH4) 2SO4}}}

properties

Like the analogous strontium compound, europium (II) oxalate occurs as a monohydrate and the crystal structure is isomorphic to it. The water of crystallization is released at 160 ° C without the divalent europium oxidizing to the trivalent one. The magnetic transition temperatures of Eu (C ₂ O ₄ ) and Eu (C ₂ O ₄ ) * H ₂ O are 1.9 ± 0.1 K and 2.8 ± 0.1 Kelvin . The isomer shift in the Mössbauer spectrum is −13.9 ± 0.1 mm · s ⁻¹ for the monohydrate as well as for the anhydrous substance compared to a ¹⁵¹ Sm ₂ O ₃ radiation source .

use

The compound is suitable for the production of divalent europium chalcogenides by reacting with H ₂X ( X = S , Se , Te ).

Individual evidence

↑ ^a ^b ^c ^d ^e ^f H. Pink: Europium (II) oxalate . In: Journal of Inorganic and General Chemistry . tape 353 , no. 5-6 , 1967, pp. 247-249 , doi : 10.1002 / zaac.19673530505 .
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ ^a ^b ^c G. J. Ehnholm, TE Katila, OV Lounasmaa, P. Reivari, GM Kalvius, GK Shenoy: Mössbauer study of hyperfine interactions in divalent europium compounds at ultra low temperatures . In: Journal of Physics A Hadrons and nuclei . tape 235 , no. 4 , August 1, 1970, pp. 289-307 , doi : 10.1007 / BF01403173 .
↑ H. Pink: On the representation of the europium chalcogenides EuS, EuSe and EuTe . In: Journal of Inorganic and General Chemistry . tape 364 , no. 5-6 , 1969, pp. 248-252 , doi : 10.1002 / zaac.19693640504 .

[Pink-1] ↑ ^a ^b ^c ^d ^e ^f H. Pink: Europium (II) oxalate . In: Journal of Inorganic and General Chemistry . tape 353 , no. 5-6 , 1967, pp. 247-249 , doi : 10.1002 / zaac.19673530505 .

[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.

[Ehnholm-3] G. J. Ehnholm, TE Katila, OV Lounasmaa, P. Reivari, GM Kalvius, GK Shenoy: Mössbauer study of hyperfine interactions in divalent europium compounds at ultra low temperatures . In: Journal of Physics A Hadrons and nuclei . tape 235 , no. 4 , August 1, 1970, pp. 289-307 , doi : 10.1007 / BF01403173 .

[Pink2-4] H. Pink: On the representation of the europium chalcogenides EuS, EuSe and EuTe . In: Journal of Inorganic and General Chemistry . tape 364 , no. 5-6 , 1969, pp. 248-252 , doi : 10.1002 / zaac.19693640504 .