Caesium oxalate

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Caesium oxalate
Preferred IUPAC name
Dicaesium oxalate
3D model (JSmol)
ECHA InfoCard 100.012.683 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 213-950-8
PubChem CID
  • 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:
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).
Infobox references

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

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

Cs2C2O4 → Cs2CO3 + CO

Double salts

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:

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 tetrahydrateCs(Ni(C2O4)2)•4H2O [7]
caesium tris(oxalato)germanate(IV)(Cs2[Ge(C2O4)3]) [8]
caesium yttrium oxalate monohydrateY(H2O)Cs(C2O4)2monoclinic 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) dihydrateCs[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 oxalatotungstateCs2WO2(C2O4)2 [13]
caesium oxalatofluorotungstateCs2WO2F2(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]

Related Research Articles

Alkali metal Group of highly-reactive chemical elements

The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). Together with hydrogen they constitute group 1, which lies in the s-block of the periodic table. All alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic properties. Indeed, the alkali metals provide the best example of group trends in properties in the periodic table, with elements exhibiting well-characterised homologous behaviour. This family of elements is also known as the lithium family after its leading element.

Caesium Chemical element, symbol Cs and atomic number 55

Caesium is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium. The most reactive of all metals, it is pyrophoric and reacts with water even at −116 °C (−177 °F). It is the least electronegative element, with a value of 0.79 on the Pauling scale. It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite, while the radioisotopes, especially caesium-137, a fission product, are extracted from waste produced by nuclear reactors.

Caesium fluoride Chemical compound

Caesium fluoride or cesium fluoride is an inorganic compound with the formula CsF and it is a hygroscopic white salt. Caesium fluoride can be used in organic synthesis as a source of the fluoride anion. Caesium also has the highest electropositivity of all non-radioactive elements and fluorine has the highest electronegativity of all elements.

Caesium chloride Chemical compound

Caesium chloride or cesium chloride is the inorganic compound with the formula CsCl. This colorless salt is an important source of caesium ions in a variety of niche applications. Its crystal structure forms a major structural type where each caesium ion is coordinated by 8 chloride ions. Caesium chloride dissolves in water. CsCl changes to NaCl structure on heating. Caesium chloride occurs naturally as impurities in carnallite, sylvite and kainite. Less than 20 tonnes of CsCl is produced annually worldwide, mostly from a caesium-bearing mineral pollucite.

Caesium chromate Chemical compound

Caesium chromate or cesium chromate is an inorganic compound with the formula Cs2CrO4. It is a yellow crystalline solid that is the caesium salt of chromic acid, and it crystallises in the orthorhombic system.

Sodium formate Chemical compound

Sodium formate, HCOONa, is the sodium salt of formic acid, HCOOH. It usually appears as a white deliquescent powder.

Caesium carbonate Chemical compound

Caesium carbonate or cesium carbonate is a white crystalline solid compound. Caesium carbonate has a high solubility in polar solvents such as water, alcohol and DMF. Its solubility is higher in organic solvents compared to other carbonates like potassium and sodium carbonates, although it remains quite insoluble in other organic solvents such as toluene, p-xylene, and chlorobenzene. This compound is used in organic synthesis as a base. It also appears to have applications in energy conversion.

Indium(III) sulfate (In2(SO4)3) is a sulfate salt of the metal indium. It is a sesquisulfate, meaning that the sulfate group occurs 11/2 times as much as the metal. It may be formed by the reaction of indium, its oxide, or its carbonate with sulfuric acid. An excess of strong acid is required, otherwise insoluble basic salts are formed. As a solid indium sulfate can be anhydrous, or take the form of a pentahydrate with five water molecules or a nonahydrate with nine molecules of water. Indium sulfate is used in the production of indium or indium containing substances. Indium sulfate also can be found in basic salts, acidic salts or double salts including indium alum.

Caesium bromide Chemical compound

Caesium bromide or cesium bromide is an ionic compound of caesium and bromine with the chemical formula CsBr. It is a white or transparent solid with melting point at 636 °C that readily dissolves in water. Its bulk crystals have the cubic CsCl structure, but the structure changes to the rocksalt type in nanometer-thin film grown on mica, LiF, KBr or NaCl substrates.

Potassium ferrioxalate Chemical compound

Potassium ferrioxalate, also called potassium trisoxalatoferrate or potassium tris(oxalato)ferrate(III) is a chemical compound with the formula K
]. It often occurs as the trihydrate K3[Fe(C2O4)3]·3H2O. Both are crystalline compounds, lime green in colour.

Barium ferrate Chemical compound

Barium ferrate is the chemical compound of formula BaFeO4. This is a rare compound containing iron in the +6 oxidation state. The ferrate(VI) ion has two unpaired electrons, making it paramagnetic. It is isostructural with BaSO4, and contains the tetrahedral [FeO4]2− anion.

Cobalt(II) hydroxide Chemical compound

Cobalt(II) hydroxide or cobaltous hydroxide is the inorganic compound with the formula Co(OH)
, consisting of divalent cobalt cations Co2+
and hydroxide anions HO
. The pure compound, often called the "beta form" is a pink solid insoluble in water.

Organosodium chemistry is the chemistry of organometallic compounds containing a carbon to sodium chemical bond. The application of organosodium compounds in chemistry is limited in part due to competition from organolithium compounds, which are commercially available and exhibit more convenient reactivity.

The carbonite ion is the double ionized ion of dihydroxymethylidene, with the chemical formula: CO2−
. Alkali metal salts, such as Li
, K
, and Cs
, have been observed at 15 K. Due to the lone pair on the carbon atom, salts of the carbonite ion would be protonated to form formate and formic acid, rather than the carbene.

Copper(II) carbonate Chemical compound

Copper(II) carbonate or cupric carbonate is a chemical compound with formula CuCO
. At ambient temperatures, it is an ionic solid consisting of copper(II) cations Cu2+
and carbonate anions CO2−

The fluorosulfates or fluorosulfonates are a set of salts of fluorosulfuric acid with an ion formula SO3F. The fluorosulfate anion can be treated as though it were a hydrogen sulfate anion with hydroxyl substituted by fluorine. The fluorosulfate ion has a low propensity to form complexes with metal cations. Since fluorine is similar in size to oxygen, the fluorosulfate ion is roughly tetrahedral and forms salts similar to those of the perchlorate ion. It is isoelectronic with hydrogen sulfate, HSO
. When an organic group is substituted for the anions, organic fluorosulfonates are formed.

Mixed anion compounds, heteroanionic materials or mixed anion materials are chemical compounds containing cations and more than one kind of anion. The compounds contain a single phase, rather than just a mixture.

The borate oxalates are chemical compounds containing borate and oxalate anions. Where the oxalate group is bound to the borate via oxygen, a more condensed anion is formed that balances less cations. These can be termed boro-oxalates, bis(oxalato)borates, or oxalatoborates or oxalate borates. The oxalatoborates are heterocyclic compounds with a ring containing -O-B-O-. Bis(oxalato)borates are spiro compounds with rings joined at the boron atom.

Yttrium oxalate 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.


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