Chemistry:Europium(III) oxalate

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Europium(III) oxalate
Names
IUPAC names
Europium(III) oxalate
Other names
  • Europium oxalate
  • Europium trioxalate
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 221-885-1
Properties
Eu2(C2O4)3
Molar mass 567.985 g·mol−1 (anhydrous)
640.046 g·mol−1 (tetrahydrate)
676.077 g·mol−1 (hexahydrate)
748.138 g·mol−1 (decahydrate)
Appearance colourless solid[1]
1,38 mg·l−1[2]
Hazards
GHS pictograms GHS05: CorrosiveGHS07: Harmful
GHS Signal word Danger
H314, H335
P261, P280, P305+351+338, P304+340, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Europium(III) oxalate (Eu2(C2O4)3) is a chemical compound of europium and oxalic acid. There are different hydrates including the decahydrate, hexahydrate and tetrahydrate.[1] Europium(II) oxalate is also known.[3]

Preparation

An excess of oxalate is added to a hot solution of Eu3+ cations. The resulting precipitate of Eu2(C2O4)3 ⋅ 10H2O is dried in a desiccator.[4]

Properties

Europium(III) oxide (Eu2O3) can be prepared by calcining europium(III) oxalate.[5]

The dehydration of Eu2(C2O4)3 · 10H2O occurs below 200 °C:[1]

[math]\ce{ Eu2(C2O4)3*10H2O -> Eu2(C2O4)3*6H2O -> Eu2(C2O4)3*4H2O -> Eu2(C2O4)3 }[/math]

The decomposition of this compound takes place in two stages, the first at 350 °C and the second at about 620 °C.[1][6]

[math]\ce{ Eu2(C2O4)3 -> Eu2[CO3]3 + 3 CO -> Eu2O3 + 3 CO2 + 3 CO }[/math]

In the Mössbauer spectrum, Eu2(C2O4)3 · 10H2O shows an isomer shift of +0,26 mm/s with a line width of 2,38 mm/s, in reference to EuF3.[4][7] The Debye temperature of Eu2(C2O4)3 is 166±15 K.[8]

Eu2(C2O4)3 · 10H2O crystallizes monoclinically in the space group of P21/c (space group no. 14) with the lattice parameters a = 1098, b = 961, c = 1004 pm and β = 114.2° with four formula units per unit cell.[9]

Nanoparticles show a line emission when excited by a light source of 393 nm, the transitions 5D0→7F1 (592 nm) and 5D0→7F2 (616 nm) can then be found in the spectrum. This can be used as a red phosphor for white LEDs.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 John K. Gibson, Nathan A. Stum (1993-10-26). "Spectroscopic investigation of the thermal decomposition of europium oxalate". Thermochimica Acta 226: 301–310. doi:10.1016/0040-6031(93)80231-X. 
  2. ↑ S. S. Berdonosov, D. G. Berdonosova, M. A. Prokofev, V. Ya. Lebedev (1976). "Study of europium oxalate decahydrate". Zh. Neorg. Khim.: 1184–1189. 
  3. ↑ H. Pink (1967-09-01). "Europium(II)-oxalat". Zeitschrift für Anorganische und Allgemeine Chemie 353 (5–6): 247–249. doi:10.1002/zaac.19673530505. 
  4. ↑ 4.0 4.1 Wynter, C. I.; Oliver, F. R.; Hill, Dana; Spijkerman, J. J.; Boyd-Bartlett, Y. P. (1991-08-01). "Short Communication: Mössbauer Effect 151Eu of in Europium Chelates". Radiochimica Acta 55 (2): 111–112. doi:10.1524/ract.1991.55.2.111. 
  5. ↑ Ginya Adachi, Nobuhito Imanaka, Zhen Chuan Kang (2004). Binary rare earth oxides. Springer Netherlands. p. 138. ISBN 978-1-4020-2568-6. https://books.google.com/books?id=NFfrEZo8WdYC&pg=PA138. 
  6. ↑ A. Glasner, E. Levy, M. Steinberg (1965). "Thermogravimetric and Differentialthermoanalyse of europium(III)oxalat and unite europium(II)salzen". Chemisches Zentralblatt (17): 05296. 
  7. ↑ Wynter, C.I.; Oliver, F.W.; Davis, Alfred; Spijkerman, J.J.; Stadelmaier, H.; Wolfe, E.A. (1993). "Mössbauer effect of 151Eu in europium oxalate and fluorides". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 76 (1–4): 352–353. doi:10.1016/0168-583X(93)95235-W. Bibcode: 1993NIMPB..76..352W. 
  8. ↑ C. I. Wynter, D. H. Ryan, S. P. Taneja, L. May, F. W. Oliver, D. E. Brown, M. Iwunzie (November 2005). "Mössbauer studies of 151Eu in europium oxalate,europium bissalen ammonium and europium benzoate". Hyperfine Interactions 166 (1–4): 499–503. doi:10.1007/s10751-006-9315-4. Bibcode: 2005HyInt.166..499W. 
  9. ↑ A. Dinu, Th. Kukku, J. Monu, P. R. Biju, N. V. Unnikrishnanaand, J. Cyriac (2019). "Structural and spectroscopic investigations on thequenching free luminescence of europium oxalatenanocrystals". Acta Crystallographica Section C 75 (5): 589–597. doi:10.1107/S2053229619005059. PMID 31062717. 
  10. ↑ Wei Zhu, You-jin Zhang, Hong-mei He, Zhi-yong Fang (2011). "Synthesis and Luminescence Property of Hierarchical Europium Oxalate Micropaticles". Chinese Journal of Chemical Physics 24 (1): 65–69. doi:10.1088/1674-0068/24/01/65-69. Bibcode: 2011ChJCP..24...65Z. 



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