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.
Formation One method to form carbonate oxalates is to heat a metal salt with ascorbic acid, which decomposes to oxalate and carbonate and combines with the metal.
Reactions When heated, oxalate carbonates decompose to carbon monoxide and carbonates, which form oxides at higher temperatures.
List formulanameformula weightcrystal formspace groupunit cell Åvolume Å3densitypropertiesreferencesScK4Ti2O2(C2O4)3·CO3[Co*(C2O4)(CO3)]2−anionic complex[CoIII(CO3)(C2O4)(NH3)2]-anionic complexSr[TiO(C2O4)CO3][Y(H2O)]2(C2O4)(CO3)2yttrium oxalate carbonate421.876orthorhombic C2221 a = 7.8177, b = 14.943, c = 9.4845, Z = 4 1108.02.526Ba[ZrO(C2O4)(CO3)][Ce(H2O)]2[(C2O4)2(CO3)]·2.5H2OtriclinicP1_a 6.329 b 8.743 c 13.000, α 105.61° β 90.55° γ 105.10°Pr4(C2O4)4(CO3)2]·3H2Ocatena(bis(μ4-Oxalato)-(μ3-oxalato)-(μ2-oxalato)-bis(μ6-carbonato)-bis(μ2-aqua)-diaqua-tetra-praseodymium hydrate)triclinicP1_a 6.298 b 8.673 c 12.970, α 105.42° β 90.55° γ 105.01°Pr2(C2O4)(CO3)2Nd4(C2O4)4(CO3)2]·3H2Ocatena-[bis(μ4-Oxalato)-(μ3-oxalato)-(μ2-oxalato)-bis(μ6-carbonato)-bis(μ2-aqua)-diaqua-tetra-neodymium hydrate]triclinicP1_a 6.273(6)Å b 8.616(7)Å c 12.928(9)Å, α 105.50(6)° β 90.52(7)° γ 105.00(6)°(NH4)2[Nd2(CO3)(C2O4)3(H2O)]·H2Odiammonium aqua—carbonato-tri—oxalato-dineodymium(III) hydratetriclinicP1_a=8.706 b=9.530 c=10.327 α = 73.35° β = 86.90° γ = 80.50° Z=2809.692.808Eu4(C2O4)4(CO3)2·3H2Ocatena(bis(μ4-Oxalato)-(μ3-oxalato)-(μ2-oxalato)-bis(μ6-carbonato)-bis(μ2-aqua)-diaqua-tetra-europium hydrate)triclinicP1_a 6.179 b 8.464 c 12.856, α 105.13° β 90.46° γ 104.86°[Eu(H2O)]2(C2O4)(CO3)2[Gd(H2O)]2(C2O4)(CO3)2[Tb(H2O)]2(C2O4)(CO3)2[Dy(H2O)]2(C2O4)(CO3)2[Ho(H2O)]2(C2O4)(CO3)2Er2(CO3)2(C2O4)(H2O)2monoclinicCma = 7.773, b = 14.920, c = 4.7309, β = 90.12° Z = 2Pb[ZrO(C2O4)CO3]Pb4(CO3)2(C2O4)(OH)2535.41monoclinicP21/ca=11.8593 b=5.2486 c=9.0997 β =96.669 Z=4562.586.321colourless(NH4)4[Th(CO3)2(C2O4)2]•0.5Н2O(NH4)4[Th(CO3)2(C2O4)2]•10Н2O(CN3H6)3(NH4)[Th(CO3)2(C2O4)2]•3Н2O(CN3H6)3(NH4)[Th(CO3)3(C2O4)]•1.5Н2O(CN3H6)3(NH4)[Th(CO3)3(C2O4)]•3Н2O(CN3H6)6[Th2(CO3)5(C2O4)]hexaguandinium pentacarbonatooxalato dithorium(CN3H6)6[Th2(CO3)5(C2O4)2]•4Н2O(CN3H6)6[Th2(CO3)5(C2O4)2]•8Н2O(CN3H6)6[Th2(CO3)4(C2O4)3]•14Н2O(CN3H6)8[Th2(CO3)7(C2O4)](CN3H6)8[Th2(CO3)7(C2O4)]•5Н2O(CN3H6)8[Th2(CO3)7(C2O4)]•6Н2O(CN3H6)8[Th2(CO3)5(C2O4)3]•Н2O(CN3H6)10[Th2(CO3)8(C2O4)]•8Н2ONa4[Th2(OH)2(CO3)4(C2O4)]•4Н2ONa4[Th2(OH)6(CO3)2(C2O4)]•2Н2ONa8Th(C2O4)2(CO3)4 •11Н2O Na8[Th(CO3)5(C2O4)]•11Н2ONa10[Th(CO3)5(C2O4)2]•11Н2ONa10[Th(CO3)5(C2O4)2]•16Н2ONa10[Th(OH)2(CO3)3(C2O4)3]•8Н2ONa10[Th(OH)2(CO3)3(C2O4)3]Na12[Th(CO3)6(C2O4)2]•11Н2OK2[Th2(OH)2(CO3)3(C2O4)]•2Н2OK2[Th2(OH)2(CO3)3(C2O4)]K4[Th(CO3)3(C2O4)]•6Н2OK5[Th2(OH)(CO3)4(C2O4)2]•2Н2OK6[Th(CO3)4(C2O4)]•8Н2OK6[Th(CO3)3(C2O4)2]•4Н2OK6[Th2(CO3)5(C2O4)2]•2Н2OK6[Th2(CO3)4(C2O4)3]•6Н2OK8[Th2(CO3)5(C2O4)3]•13Н2OK8[Th2(CO3)5(C2O4)3]•16Н2OK10[Th2(CO3)7(C2O4)2]•8Н2OK10[Th2(CO3)7(C2O4)2]•12Н2OK10[Th2(CO3)7(C2O4)2]•14Н2OK10[Th2(CO3)5(C2O4)4]•5Н2OK10[Th2(CO3)5(C2O4)4]•7Н2O(NH4)(CN3H6)3[(UO2)2(CO3)(C2O4)2(C3H4N2O2)] · H2O (CN3H6)4[(UO2)2(CO3)(C2O4)2(C5H8N2O2)] · 1.5H2O guanidonium μ-carbonate μ-ethylmethylgyoximatedioxylatediuranylate sesquihydratemonoclinicP21a=6.909 b=15.794 c=30.064 β=96.720° Z=432582.383red plates(CN3H6)4[(UO2)2(CO3)(C2O4)2(C6H8N2O2)] · 3H2O (NH4)(CN3H6)4[(UO2)2(CO3)(C2O4)2(C6H4N2O2)] · H2O (CN3H6)4[(UO2)2(C6H8N2O2)(CO3)(C2O4)2] · (C6H10N2O2) · 2H2Oguanidinium (3-methyl-1,2-cyclopenadionedioxime)dioxalato (μ-3-methyl-1,2-cyclopenadionedioxato) μ-carbonatodiuranylate dihydratetriclinicP1_a=9.2474 b=14.8562 c=16.8917 α = 68.504° β = 77.721° γ = 89.792° Z=22102.72.108red(CN3H6)4[(UO2)2(CO3)(C2O4)2(C7H10N2O2)] · H2ONH4(CN3H6)3[(UO2)2(C7H10N2O2)(CO3)(C2O4)2] · 2H2Oammonium guanidinium dioxalato (μ-3-methyl-1,2-cyclopenadionedioxato) μ-carbonatodiuranylate dihydrateorthorhombicP212121a=9.904 b=17.400 c=18.757 Z=43232.22.393red(CN3H6)4[(UO2)2(CO3)(C2O4)2(C6H10N2O2)] · H2Oguanidinium dioxalato μ-diethylglyoximato μ-carbonatodiuranylate monohydrate1176.59monoclinicP21/na=7.6140 b=15.4388 c=28.010 β=95.99° Z=43274.62.387orange(CN3H6)2(C2H2N2)[(UO2)2(CO3)(C2O4)2(C6H10N2O2)] · 3H2Oguanidinium ethylenediammonium dioxalato μ-diethylglyoximato μ-carbonatodiuranylate monohydrateorange[C(NH2)3]10[(UO2)6(μ3-O)2(μ2-OH)2(C2O4)4(CO3)4]· 2H2O2913.21triclinicP1_a=11.5919 b=11.7868 c=13.3545 α = 102.637° β = 93.278° γ = 95.273° Z=11759.72.749yellowPlutonium(III) dioxalate monocarbonatePlutonium(III) monooxalate dicarbonate
References