Caesium oxalate
Chemical compound
From Wikipedia, the free encyclopedia
Caesium oxalate (standard IUPAC spelling), or dicesium oxalate, or cesium oxalate (American spelling) 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.
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| Names | |
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| IUPAC name
Caesium oxalate | |
| Preferred IUPAC name
Dicaesium oxalate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.012.683 |
| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Cs2C2O4 | |
| Molar mass | 353.829 g·mol−1 |
| Appearance | White solid |
| 76 g/(100 ml) (25 °C)[1] | |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| 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).
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Preparation
Caesium oxalate can be prepared by passing carbon monoxide and carbon dioxide over caesium carbonate at 380 °C:[2]
- Cs2CO3 + CO → Cs2C2O4
Other alkali carbonates do not undergo transformation to oxalate.[2]
Caesium carbonate can react with oxalic acid in aqueous solution to give caesium oxalate.[3]
- Cs2CO3 + H2C2O4·2H2O → Cs2C2O4·H2O + CO2 + 2 H2O
Reactions
Caesium oxalate can be reduced back into caesium carbonate and carbon monoxide by thermal decomposition.
- Cs2C2O4 → Cs2CO3 + CO
Double salts
Compounds that contain caesium and another element in addition to the oxalate anion are double salts of caesium and oxalate. 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)oxotitanate(IV) trihydrate | Cs4[TiO(C2O4)2]2·3H2O | [4] | |
| caesium oxalatooxovanadate(IV) | Cs2[VO(C2O4)2] | [5] | |
| caesium tris(oxalato) ferrate(III) dihydrate | Cs3[Fe(C2O4)3]·2H2O | [6] | |
| caesium bis(oxalato) cobaltate(II) tetrahydrate | Cs2[Co(C2O4)2]·4H2O | [7] | |
| caesium bis(oxalato)nickelate(III) tetrahydrate | Cs[Ni(C2O4)2]·4H2O | [8] | |
| caesium tris(oxalato)germanate(IV) | Cs2[Ge(C2O4)3] | [9] | |
| caesium yttrium(III) oxalate monohydrate | CsY(C2O4)2·H2O | monoclinic a = 8.979, b = 6.2299, c = 8.103 Å, β = 90.05° V = 453.3 Å3, space group P2/n | [10] |
| caesium (diaquo)bis(oxalato)oxoniobate(V) dihydrate | Cs[NbO(C2O4)2(H2O)2]·2H2O | [11] | |
| Cs2[NH4]2[Mo3O8(C2O4)3] | [12] | ||
| tetracaesium dilanthanum(III) oxalate octahydrate | Cs4La2(C2O4)5·8H2O | [13] | |
| tetracaesium dipraseodymium(III) oxalate octahydrate | Cs4Pr2(C2O4)5·8H2O | [13] | |
| caesium neodymium(III) oxalate hexahydrate | CsNd(C2O4)2·6H2O | [13] | |
| caesium samarium(III) oxalate hexahydrate | CsSm(C2O4)2·6H2O | [13] | |
| caesium dysprosium(III) oxalate hydrate | CsDy(C2O4)2·?H2O | [13] | |
| caesium gadolinium(III) oxalate sesquihydrate | CsGd(C2O4)2·1.5H2O | [13] | |
| caesium terbium(III) oxalate sesquihydrate | CsTb(C2O4)2·1.5H2O | [13] | |
| caesium dysprosium(III) oxalate sesquihydrate | CsDy(C2O4)2·1.5H2O | [13] | |
| caesium holmium(III) oxalate sesquihydrate | CsHo(C2O4)2·1.5H2O | [13] | |
| caesium ytterbium(III) oxalate sesquihydrate | CsYb(C2O4)2·1.5H2O | [13] | |
| caesium lutetium(III) oxalate sesquihydrate | CsLu(C2O4)2·1.5H2O | [13] | |
| dicaesium dioxotungsten(VI) oxalate | Cs2[WO2](C2O4)2 | [14] | |
| dicaesium dioxotungsten(VI) difluoride monooxalate | Cs2[WO2]F2(C2O4) | [14] | |
| caesium tris(oxalato)rhenate(III) | Cs3[Re(C2O4)3] | [15] | |
| dicaesium uranyl monooxalate monosulfate dihydrate | Cs2[UO2](C2O4)(SO4)·2H2O | [16] | |
| ammonium caesium uranyl monooxalate monosulfate dihydrate | [NH4]Cs[UO2](C2O4)(SO4)·2H2O | [16] | |
| caesium dioxoneptunium(VI) oxalate hydrate | Cs[NpO2]C2O4·nH2O | [17] |
Mixed anion compounds containing caesium, oxalate and another anion also exist, such as the uranyl sulfate above, and caesium bis(oxalato)borate (CsBOB) (Cs[B(C2O4)2]).[18]