Caesium oxalate

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Caesium oxalate
Cesium oxalate.svg
Preferred IUPAC name
Dicaesium oxalate
3D model (JSmol)
ECHA InfoCard 100.012.683 Edit this at Wikidata
EC Number
  • 213-950-8
  • InChI=1S/C2H2O4.2Cs/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);;/q;2*+1/p-2
  • C(=O)(C(=O)[O-])[O-].[Cs+].[Cs+]
Molar mass 353.829 g·mol−1
GHS labelling:
GHS07: Exclamation mark
H302, H312
P264, P270, P280, P301+P312, P302+P352, P312, P322, P330, P363, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Caesium oxalate (standard IUPAC spelling) dicesium oxalate, or cesium oxalate (American spelling) is the oxalate of caesium. Caesium oxalate has the chemical formula of Cs2C2O4.


Caesium oxalate can be prepared by passing carbon monoxide and carbon dioxide over caesium carbonate at 380 °C:[1]

Cs2CO3 + CO + CO2 → Cs2C2O4 + CO2

Other alkali carbonates do not undergo transformation to oxalate.[1]

Caesium carbonate can react with oxalic acid in aqueous solution to give caesium oxalate.[2]

Cs2CO3 + H2C2O4•2H2O → Cs2C2O4•H2O + CO2 + H2O

Chemical Reactions[edit]

Caesium oxalate can be reduced back into caesium carbonate and carbon dioxide by thermal decomposition.

Cs2C2O4 → Cs2CO3 + CO

Double salts[edit]

Compounds that contain caesium and another element in addition to the oxalate anion are double salts. The oxalate may form a complex with a metal that can make a salt with caesium.

Examples include:

name formula properties reference
caesium-bis(oxalato)oxo-titanate(IV) hydrate (Cs4[TiO(C2O4)2]2•3H2O) [3]
caesium oxalatooxovanadate(IV) Cs2[VO(C2O4)2] [4]
caesium tris(oxalato) ferrate(III) dihydrate (Cs3Fe(ox)3•2H2O) [5]
Cs2Co(C2O4)2·4H2O [6]
caesium bis(oxalato)nickelate tetrahydrate Cs(Ni(C2O4)2)•4H2O [7]
caesium tris(oxalato)germanate(IV) (Cs2[Ge(C2O4)3]) [8]
caesium yttrium oxalate monohydrate Y(H2O)Cs(C2O4)2 monoclinic a = 8.979, b = 6.2299, c = 8.103 Å, β = 90.05° V = 453.3 Å3, space group P2/n [9]
caesium oxy bis(oxalato)niobate(V) dihydrate Cs[NbO(C2O4)2(H2O)2]•2H2O [10]
Cs2(NH4)2[Mo3O8(C2O4)3] [11]
Cs4La2(C2O4)5•8H2O [12]
Cs4Pr2(C2O4)5•8H2O [12]
CsNd(C2O4)2•6H2O [12]
CsSm(C2O4)2•6H2O [12]
CsDy(C2O4)2•?H2O [12]
CsGd(C2O4)2•1.5H2O [12]
CsTb(C2O4)2•1.5H2O [12]
CsDy(C2O4)2•1.5H2O [12]
CsHo(C2O4)2•?1.5H2O [12]
CsYb(C2O4)2•1.5H2O [12]
CsLu(C2O4)2•1.5H2O [12]
caesium oxalatotungstate Cs2WO2(C2O4)2 [13]
caesium oxalatofluorotungstate Cs2WO2F2(C2O4) [13]
Cs3[Re(C2O4)3] [14]
Cs2UO2(C2O4)(SO4)(H2O)2) [15]
Cs(NH4)(UO2(C2O4)(SO4)•2H2O [15]
caesium neptunium oxalate (CsNpO2C2O4•nH2O) [16]

Mixed anion compounds containing caesium, oxalate and another anion also exist, such as the uranyl sulfate above, and caesium bis(oxalaoto)borate (CsBOB) (CsC4O8B).[17]


  1. ^ a b Kudo, Kiyoshi; Ikoma, Futoshi; Mori, Sadayuki; Komatsu, Koichi; Sugita, Nobuyuki (1997). "Synthesis of oxalate from carbon monoxide and carbon dioxide in the presence of caesium carbonate". Journal of the Chemical Society, Perkin Transactions 2 (4): 679–682. doi:10.1039/A607856G.
  2. ^ Dinnebier, Robert E.; Vensky, Sascha; Panthöfer, Martin; Jansen, Martin (2003-03-01). "Crystal and Molecular Structures of Alkali Oxalates: First Proof of a Staggered Oxalate Anion in the Solid State". Inorganic Chemistry. 42 (5): 1499–1507. doi:10.1021/ic0205536. ISSN 0020-1669. PMID 12611516.
  3. ^ Fester, A.; Bensch, W.; Trömel, M. (March 1992). "Crystal structure of cesium-bis(oxalato)oxo-titanate(IV) hydrate". Inorganica Chimica Acta. 193 (1): 99–103. doi:10.1016/S0020-1693(00)83801-3.
  4. ^ Bhaumik, B. B.; Chattopadhyay, R. K. (April 1981). "Oxalatooxovanadates (IV)" (PDF). Indian J. Chem. 20A: 417–419.
  5. ^ Randhawa, B. S. (September 1995). "Mössbauer study on thermal decomposition of cesium tris(oxalato) ferrate(III) dihydrate". Journal of Radioanalytical and Nuclear Chemistry. 201 (1): 57–63. doi:10.1007/bf02204772. S2CID 97013742.
  6. ^ Schwendtner, Karolina; Kolitsch, Uwe (2004-05-15). "Cs 2 Co II (C 2 O 4 ) 2 ·4H 2 O". Acta Crystallographica Section E. 60 (5): m659–m661. doi:10.1107/S1600536804009626. ISSN 1600-5368.
  7. ^ Modebadze, M. E. (1987). "Study of oxalate compounds of nickel". Investigations in Chemistry of Complexes and Compounds of Certain Transition and Rare Metals. No. 4 (in Russian).
  8. ^ Lopez, Jordan R.; Akutsu, Hiroki; Martin, Lee (November 2015). "Radical-cation salt with novel BEDT-TTF packing motif containing tris(oxalato)germanate(IV)" (PDF). Synthetic Metals. 209: 188–191. doi:10.1016/j.synthmet.2015.07.019.
  9. ^ Bataille, Thierry; Auffrédic, Jean-Paul; Louër, Daniel (2000). "Crystal structure and thermal behaviour of the new layered oxalate Y(H2O)Cs(C2O4)2 studied by powder X-ray diffraction". Journal of Materials Chemistry. 10 (7): 1707–1711. doi:10.1039/b001201g.
  10. ^ Brničević, N.; Djordjević, C. (February 1976). "Co-ordination complexes of niobium and tantalum XVI. salts of oxy-bis-oxalato niobate (V)". Journal of the Less Common Metals. 45 (1): 45–52. doi:10.1016/0022-5088(76)90195-8.
  11. ^ Goel, S. P.; Verma, G. R.; Kumar, Sanjive; Sharma, M. P. (February 1991). "Preparation of cesium trimolybdate by the thermal decomposition of a new oxomolybdenum(VI) oxalato complex". Journal of Thermal Analysis. 37 (2): 427–432. doi:10.1007/BF02055943. ISSN 0368-4466. S2CID 94623703.
  12. ^ a b c d e f g h i j k Genčova, O.; Šiftar, J. (May 1995). "Synthesis and thermal characteristics of caesium oxalato-metallates of some rare earths". Journal of Thermal Analysis. 44 (5): 1171–1176. doi:10.1007/BF02547547. ISSN 0368-4466. S2CID 94768537.
  13. ^ a b Sengupta, A. K.; Bhaumik, B. B.; Nath, S. K. (June 1983). "Oxalatofluorotungstates (VI) & Oxalatotungstates (VI) of Some Alkali Metals & Complex Cations" (PDF). Indian Journal of Chemistry. 22A: 535–536.
  14. ^ Hadadzadeh, Hassan; Rezvani, Ali Reza; Salehi Rad, Ali Reza; Khozeymeh, Elahe (August 2008). "A Novel Method for Preparation of Alumina-Supported Rhenium-Cesium Catalyst, Re-Cs/g-Al2O3". Iranian Journal of Chemistry and Chemical Engineering. 27 (3). doi:10.30492/ijcce.2008.6965.
  15. ^ a b Chernyaev, I. I.; Golovnya, V. A.; Shchelokov, R. N. (1960-07-01). "Aquo-Oxalato-Sulfate Compounds of Uranium" [Aquo-Oxalato-Sulfate Compounds of Uranium]. Zhur. Neorg. Khim. (in Russian). 5. OSTI 4166316.
  16. ^ Charushnikova, I. A.; Krot, N. N.; Polyakova, I. N. (May 2006). "Synthesis and crystal structure of double Np(V) cesium oxalate CsNpO2C2O4 · nH2O". Radiochemistry. 48 (3): 223–226. doi:10.1134/S1066362206030039. S2CID 92883386.
  17. ^ Kazdobin, K. A.; Diamant, V. A.; Trachevskii, V. V. "MICROWAVE – ASSISTED SYNTHESIS OF BIS (OXALATO) ALKALI METAL BORATES". {{cite journal}}: Cite journal requires |journal= (help)