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
ECHA InfoCard 100.019.896 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 221-885-1
PubChem CID
  • InChI=1S/3C2H2O4.2Eu/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6
    Key: PVDYMOCCGHXJAK-UHFFFAOYSA-H
  • C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Eu+3].[Eu+3]
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)
Appearancecolourless solid [1]
1,38 mg·l−1 [2]
Hazards
GHS labelling:
GHS-pictogram-acid.svg GHS-pictogram-exclam.svg
Danger
H314, H335
P261, P280, P304+P340, P305+P351+P338, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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]

Contents

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]

Eu2(C2O4)3·10H2O → Eu2(C2O4)3·6H2O → Eu2(C2O4)3·4H2O → Eu2(C2O4)3

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

Eu2(C2O4)3 → Eu2[CO3]3 + 3 CO → Eu2O3 + 3 CO2 + 3 CO

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]

Related Research Articles

<span class="mw-page-title-main">Europium</span> Chemical element with atomic number 63 (Eu)

Europium is a chemical element; it has symbol Eu and atomic number 63. Europium is a silvery-white metal of the lanthanide series that reacts readily with air to form a dark oxide coating. It is the most chemically reactive, least dense, and softest of the lanthanide elements. It is soft enough to be cut with a knife. Europium was isolated in 1901 and named after the continent of Europe. Europium usually assumes the oxidation state +3, like other members of the lanthanide series, but compounds having oxidation state +2 are also common. All europium compounds with oxidation state +2 are slightly reducing. Europium has no significant biological role and is relatively non-toxic compared to other heavy metals. Most applications of europium exploit the phosphorescence of europium compounds. Europium is one of the rarest of the rare-earth elements on Earth.

<span class="mw-page-title-main">Strontium aluminate</span> Chemical compound

Strontium aluminate is an aluminate compound with the chemical formula SrAl2O4. It is a pale yellow, monoclinic crystalline powder that is odourless and non-flammable. When activated with a suitable dopant, it acts as a photoluminescent phosphor with long persistence of phosphorescence.

<span class="mw-page-title-main">Iron(II) oxalate</span> Chemical compound

Ferrous oxalate (iron(II) oxalate) refers to inorganic compounds with the formula FeC2O4(H2O)x where x is 0 or 2. These are orange compounds. Characteristic of metal oxalate complexes, these compounds tend to be polymeric, hence their low solubility in water.

<span class="mw-page-title-main">Ferric oxalate</span> Chemical compound

Ferric oxalate, also known as iron(III) oxalate, refers to inorganic compounds with the formula Fe2(C2O4)3(H2O)x but could also refer to salts of [Fe(C2O4)3]3-. Fe2(C2O4)3(H2O)x are coordination polymers with varying degrees of hydration. The coordination complex with the formula [Fe(C2O4)3]3- forms a variety of salts, a well-known example being potassium ferrioxalate. This article emphasizes the coordination polymers.

Potassium ferrooxalate, also known as potassium bisoxalatoferrate(II), is a salt with the formula K2Fe(C2O4)2(H2O)x. The anion is a transition metal oxalate complex, consisting of an atom of iron in the +2 oxidation state bound to oxalate (C
2O2−
4) ligands and water.

<span class="mw-page-title-main">Caesium oxalate</span> Chemical compound

Caesium oxalate, or dicesium oxalate, or cesium oxalate is a chemical compound with the chemical formula Cs2C2O4. It is a caesium salt of oxalic acid. It consists of caesium cations Cs+ and oxalate anions C2O2−4.

The oxonitridosilicates, also called sions or silicon-oxynitrides are inorganic ceramic compounds in which oxygen and nitrogen atoms are bound to a silicon atom. A common variant also has aluminium replacing some silicon. They can be considered as silicates in which nitrogen partially replaces oxygen, or as nitridosilicates with oxygen partly replacing nitrogen.

<span class="mw-page-title-main">Yttrium oxalate</span> Chemical compound

Yttrium oxalate is an inorganic compound, a salt of yttrium and oxalic acid with the chemical formula Y2(C2O4)3. The compound does not dissolve in water and forms crystalline hydrates—colorless crystals.

The carbonate oxalates are mixed anion compounds that contain both carbonate (CO3) and oxalate (C2O4) anions. Most compounds incorporate large trivalent metal ions, such as the rare earth elements. Some carbonate oxalate compounds of variable composition are formed by heating oxalates.

Samarium(III) oxalate is an inorganic compound, a salt of samarium and oxalic acid with the formula Sm2(C2O4)3. The compound does not dissolve in water, forms a crystalline hydrate with yellow crystals.

Europium phosphide is an inorganic compound of europium and phosphorus with the chemical formula EuP. Other phosphides are also known.

<span class="mw-page-title-main">Europium(III) acetate</span> Chemical compound

Europium(III) acetate is an inorganic salt of europium and acetic acid with the chemical formula of Eu(CH3COO)3. In this compound, europium exhibits the +3 oxidation state. It can exist in the anhydrous form, sesquihydrate and tetrahydrate. Its hydrate molecule is a dimer.

<span class="mw-page-title-main">Europium(II) titanate</span> Chemical compound

Europium(II) titanate is a black mixed oxide of europium and titanium, with the chemical formula of EuTiO3. It crystallizes in the perovskite structure.

Europium(III) chromate is a chemical compound composed of europium, chromium and oxygen with europium in the +3 oxidation state, chromium in the +5 oxidation state and oxygen in the −2 oxidation state. It has the chemical formula of EuCrO4.

<span class="mw-page-title-main">Europium compounds</span> Chemical compounds

Europium compounds are compounds formed by the lanthanide metal europium (Eu). In these compounds, europium generally exhibits the +3 oxidation state, such as EuCl3, Eu(NO3)3 and Eu(CH3COO)3. Compounds with europium in the +2 oxidation state are also known. The +2 ion of europium is the most stable divalent ion of lanthanide metals in aqueous solution. Many europium compounds fluoresce under ultraviolet light due to the excitation of electrons to higher energy levels. Lipophilic europium complexes often feature acetylacetonate-like ligands, e.g., Eufod.

Europium(III) iodide is an inorganic compound containing europium and iodine with the chemical formula EuI3.

Europium(III) telluride is an inorganic compound, one of the tellurides of europium, with the chemical formula Eu2Te3. In this compound, Eu is in the +3 oxidation state. It can form cubic crystals. It has limited solubility in lead telluride and forms a solid solution.

Europium(III) carbonate is an inorganic compound with the chemical formula Eu2(CO3)3.

<span class="mw-page-title-main">Promethium(III) oxalate</span> Chemical compound

Promethium(III) oxalate is an oxalate of promethium, with the chemical formula Pm2(C2O4)3. Its decahydrate crystallizes in the monoclinic crystal system with space group P21/m. Promethium(III) oxalate trihydrate can decompose into stable basic carbonate Pm2O2CO3, and generate promethium(III) oxide at higher temperatures.

<span class="mw-page-title-main">Terbium(III) oxalate</span> Chemical compound

Terbium(III) oxalate is the oxalate of terbium with the chemical formula Tb2(C2O4)3. Its decahydrate can be obtained by reacting terbium(III) chloride and oxalic acid in an aqueous solution. Its decahydrate gradually loses water when heated and becomes anhydrous. Continued heating obtains terbium(III,IV) oxide. It decomposes in isolation from air to form terbium(III) oxide. The decomposed gas products are carbon monoxide and carbon dioxide. It reacts with hydrochloric acid to obtain H[Tb(C2O4)2]·6H2O.

References

  1. 1 2 3 4 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  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. 1 2 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. S2CID   99690174.
  5. ↑ Ginya Adachi, Nobuhito Imanaka, Zhen Chuan Kang (2004). Binary rare earth oxides. Springer Netherlands. p. 138. ISBN   978-1-4020-2568-6.{{cite book}}: CS1 maint: multiple names: authors list (link)
  6. ↑ A. Glasner, E. Levy, M. Steinberg (1965). "Thermogravimetric and Differentialthermoanalyse of europium(III)oxalat and unite europium(II)salzen". Chemisches Zentralblatt (17): 05296.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  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. Bibcode:1993NIMPB..76..352W. doi:10.1016/0168-583X(93)95235-W.
  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. Bibcode:2005HyInt.166..499W. doi:10.1007/s10751-006-9315-4. S2CID   95479298.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  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. S2CID   146808653.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  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. Bibcode:2011ChJCP..24...65Z. doi:10.1088/1674-0068/24/01/65-69.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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