Oxalate sulfates are mixed anion compounds containing oxalate and sulfate. They are mostly transparent, and any colour comes from the cations.
Related compounds include the sulfite oxalates and oxalate selenates.
Production Oxalate sulfates may be deposited from a solution in water of the metal anions and sulfate with oxalic acid when evaporated. Crystals formed this way may be hydrates.
Properties Many crystal forms are non-centrosymmetric and have non-linear optical properties.
When heated, oxalate sulfates will first dehydrate, and then give off carbon dioxide.
List nameformulasystemspace groupunit cell Åvolumedensitycommentreflithium sulfate monohydrate oxalate?triclinicP1a = 3.4014 b = 5.0397 c = 6.120 α = 78.62° β= 84.95° γ = 81.14° 101.45band gap 4.57 eV dielectric constant 29.7 stable below 83 °C piezoelectric coefficient 6pC/Nhomopiperazinium dimagnesium dioxalate sulfate dihydrateC5H14N2•Mg2•[C2O4]2•SO4•2H2OmonoclinicIaa=11.5673 b=27.3352 c=16.6097 β=95.255° Z=125229.81.749colourlesspiperazinium magnesium oxalate sulfate hydrateC4H12N2•Mg•[C2O4]•SO4•H2OmonoclinicP21/ca=12.7330 b=8.9240 c=11.8172 β=115.502° Z=41211.951.724colourlesspotassium sulphato oxalate ?triclinica = 6.37 b = 7.03 c = 10.61 α = 93.96 ̊ β = 101.37 ̊ γ = 100.1 ̊colourless > 300 nm; SHG 1.6×KDPbapp = 1,4-bis(3-aminopropyl)piperazine(H4bapp)0.5·VO(SO4)(C2O4)triclinicPa=6.2031 b=8.6599 c=12.1853 α=77.130° β=76.207° γ=82.987°bipy=4,4′-bipyridine; (μ2-Oxalato-O,O',O'',O''')-tetrakis(2,2'-bipyridine)-di-chromium(iii) disulfate 2,2'-bipyridine solvate monohydrate[Cr2(bipy)4(C2O4)](SO4)·(bipy)0.5·H2OtriclinicPa=11.610 b=12.668 c=17.155 α=77.297° β=83.957° γ=85.458°depa = 3-(diethylamino)propylamineH2depa⋅Mn2(SO4)(C2O4)2(H2O)⋅H2OorthorhombicPbcaa=14.6293 b=15.6671 c=17.3579hpip = homopiperazineH2hpip·Mn2(SO4)(C2O4)2(H2O)orthorhombicP212121a=9.9066 b=12.4496 c=13.6640pip = piperazine; piperazinediium (μ-oxalato)-bis(μ-sulfato)-diaqua-di-manganese(ii) dihydrateH2pip·Mn2(SO4)2(C2O4)(H2O)4triclinicPa 6.6501(4)Å b 7.7034(4)Å c 9.6810(5)Å, α 69.850(4)° β 70.553(5)° γ 83.921(4)°ipa = 3,3′-iminobis(N,N-dimethylpropylamine) bis(3-dimethylammoniopropyl)ammonium pentakis(μ-oxalato)-bis(μ-sulfato)-tetra-manganese(ii) dihydrateH3ipa⋅Mn2(SO4)(C2O4)2.5·H2OtriclinicPa 9.9379(6)Å b 11.2423(6)Å c 11.6390(7)Å, α 86.793(5)° β 81.644(5)° γ 74.481(5)°dpta = dipropylenetriamine; bis(3-ammoniopropyl)ammonium tris(μ-oxalato)-bis(μ-sulfato)-bis(sulfato)-hexa-aqua-tetra-manganese(ii)H3dpta⋅Mn2(SO4)2(C2O4)1.5(H2O)3triclinicPa 8.6819(3)Å b 10.1689(3)Å c 13.7456(5)Å, α 70.197(3)° β 73.406(3)° γ 87.636(3)°dmen = N,N-dimethylethylenediamineH2dmen·Mn(SO4)(C2O4)monoclinicP21/na=9.8603 b=12.6525 c=10.0837 β=113.002°bis(N,N-dimethylpropane-1,3-diaminium) bis(μ-oxalato)-bis(μ-sulfato)-di-manganesetriclinicPa=8.5307 b=9.0432 c=9.6913 α=69.632° β=64.639° γ=88.148°butane-1,4-diaminium bis(μ-oxalato)-(μ-sulfato)-aqua-di-manganesetriclinicPa=8.5468 b=10.0050 c=10.6532 α=75.445° β=79.787° γ=71.848°Na2Fe(C2O4)SO4⋅H2Oorange; most air sensitive(μ-oxalato)-(μ-sulfato)-iron-di-potassiumK2[Fe(C2O4)(SO4)]monoclinicP21/ca=5.8735 b=10.2169 c=13.1491 β=91.226°tris(μ-oxalato)-bis(μ-sulfato)-tri-iron-tetra-potassiumK4[Fe3(C2O4)3(SO4)2]monoclinicP21/ca 13.739 b 5.496 c 12.774 β 97.677°acid oxalo-bisulfate of roseocobalt ??Co2(HN3)10(C2O4)(SO4)2 ·H2O·H2C2O4speculative[Co(NH3)4(C2O4)]2SO4·2H2O[Co(NH3)4(C2O4)]2S2O6tris(μ-aqua)-tris(μ-oxalato)-tris(μ-sulfato)-tri-cobalt-hexa-sodiumNa2[Co(C2O4)(SO4)]·H2OhexagonalP2ma=10.2322 c=6.4774tris(μ-oxalato)-bis(μ-sulfato)-bis(2-((2-aminoethyl)amino)ethanaminium)-tetraaqua-tetra-cobalttriclinicPa=8.6065 b=9.5595 c=9.5987 α=77.884° β=82.744° γ=87.356°bis(μ-oxalato)-bis(μ-sulfato)-bis(4-(2-aminoethyl)piperazin-1-ium)-tri-cobalttriclinicPa=8.4331 b=9.4691 c=9.5144 α=71.522° β=64.356° γ=89.622°1,4-dimethylpiperazinedi-ium bis(μ-oxalato)-hepta-aqua-tri-cobalt bis(sulfate)(H2dmp)(SO4)3Co3(C2O4)2(H2O)7orthorhombicPnmaa=11.1050 b=16.4221 c=13.9815violetBis[tris(oxamide dioxime-2N,N')cobalt(III)] oxalate bis(sulfate) dodecahydrate[Co(C2H6N4O2)3]2(C2O4)(SO4)212H2OtriclinicPa = 9.430 b = 11.782 c = 12.812 α = 65.494° β = 83.088° γ = 86.735° Z=11285.71.698at 193K; redhomopiperazinium dizinc dioxalate sulfate hydrateC5H14N2•Zn2•[C2O4]2•SO4•H2OmonoclinicP21a=15.8356 b=13.5022 c=15.9578 β=109.075° Z=83224.72.154colourlesshomopiperazinium dizinc dioxalate sulfate dihydrateC5H14N2•Zn2•[C2O4]2•SO4•2H2OmonoclinicIaa=11.5681 b=27.1755 c=16.5979 β=94.946° Z=125198.42.074colourlessbis(4-(2-aminoethyl)piperazin-1-ium)-bis(μ-oxalato)-bis(μ-sulfato)-tri-zinctriclinicPa=8.407 b=9.523 c=9.543 α=108.39° β=115.52° γ=90.17°1,4-dimethylpiperazinedi-ium bis(sulfate) bis(μ-oxalato)-hepta-aqua-tri-zinc(H2dmp)(SO4)3Zn3(C2O4)2(H2O)7orthorhombicPnmaa 11.1058 b 16.3449 c 14.0064colourless(Hgly)2·Zn(SO4)(C2O4)monoclinicC2a 19.1509 b 5.4000 c 12.8206 β 102.878°RbFe(SO4)(C2O4)0.5·H2OmonoclinicP21/ca = 7.9193, b = 9.4907, c = 8.8090, β = 95.180°, Z = 4bis(μ3-sulfato)-bis(μ2-oxalato)-diaqua-di-yttrium diammonium[NH4][Y(H2O)(SO4)(C2O4)]monoclinicP21/na=6.534 b=8.527 c=13.745 β=92.87°bis(μ3-Sulfato-O,O,O',O'',O''')-(μ2-oxalato-O,O',O'',O''')-(μ2-piperazine-diium-1,4-diacetato-O,O')-diaqua-di-yttrium(iii)Y2(H2pda)(C2O4)(SO4)2(H2O)2]monoclinicC2/ca 19.392 b 6.2757 c 16.999 β 108.279°levinsonite-(Y)(Y,Nd,Ce)Al(SO4)2(C2O4) · 12H2OmonoclinicP2/na = 10.289 Å, b = 9.234, c = 11.015 β = 108.50°992.42.181Biaxial (+) Refractive index: nα = 1.480 nβ = 1.490 nγ = 1.550thfa = tetrahydrofurfurylamine; bis(tetrahydrofurfurylammonium) tris(μ-oxalato)-(μ-sulfato)-di-indium(iii) dihydrate(Hthfa)2·In2(SO4)(C2O4)3·2H2OmonoclinicP21/ca=10.7581 b=12.9985 c=19.9093 β=92.876°bapp = N,N′-bis(3-aminopropyl)piperazineH4bapp·[In2(SO4)3(C2O4)2(H2O)2]·H2OmonoclinicI2/aa=13.8931 b=14.6792 c=15.2418 β=111.153°bis(1-ethylpiperazinedi-ium) tris(μ-oxalato)-bis(sulfato)-di-indiumH2epip·[In2(SO4)2(C2O4)3]tetragonalI41/aa=26.0767 c=8.9467colourlessPiperazinediium bis(μ2-oxalato-O,O',O'',O''')-bis(μ2-sulfato-O,O')-diaqua-di-indium dihydrate[C4N2H12]0.5InSO4C2O4·2H2OmonoclinicP21/ca=6.478 b=11.067 c=14.317 β=100.302°Hgly·In(SO4)(C2O4)(gly)monoclinicP21a 6.5179(2)Å b 10.9928(3)Å c 18.0301(6)Å, α 90° β 93.9700(10)°CsMn(SO4)(C2O4)0.5·H2OmonoclinicP21/ca = 8.065, b = 9.610, c = 9.219, β = 94.564°, Z = 4CsFe(SO4)(C2O4)0.5·H2OmonoclinicP21/ca = 7.9377, b = 9.5757, c = 9.1474, β = 96.104°, Z = 4La2(C2O4)(SO4)2(H2O)3monoclinicP21/na=9.838 b=9.817 c=13.111 β=104.258°bis(μ3-sulfato)-bis(μ2-oxalato)-diaqua-di-lanthanum diammonium[NH4][La(H2O)(SO4)(C2O4)]monoclinicP21/na=6.629 b=8.673 c=13.867 β=93.35°(μ4-Piperazine-diium-1,4-diacetato-O,O',O'',O''')-bis(μ3-sulfato-O,O',O'')-(μ2-oxalato-O,O',O'',O''')-diaqua-di-cerium(iii) dihydrateCe2(H2pda)(C2O4)(SO4)2(H2O)2 · 2H2OmonoclinicC2/ca 19.353 b 6.836 c 16.400 β 94.312°coskrenite-(Ce)(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2Otriclinica = 6.007(1) Å, b = 8.368(2) Å, c = 9.189(2) Å α = 99.90(2)°, β = 105.55(2)°, γ = 107.71(2)°2.881Biaxial (-) refractive indices: nα = 1.544 nβ = 1.578 nγ = 1.602; Birefringence: δ = 0.058zugshunstite-(Ce)(Ce,Nd,La)Al(SO4)2(C2O4) · 12H2OMonoclinicC2/ca = 8.718 b = 18.313 c = 13.128 β = 93.90°20912.121Large REE; pink in incandescent light; blue in fluorescent light; Biaxial (+) refractive index: nα = 1.455 nβ = 1.485 nγ = 1.528; (μ4-Piperazine-diium-1,4-diacetato-O,O',O'',O''')-bis(μ3-sulfato-O,O',O'')-(μ2-oxalato-O,O',O'',O''')-diaqua-di-praseodymium(iii) dihydratePr2(H2pda)(C2O4)(SO4)2(H2O)2 · 2H2OmonoclinicC2/ca 19.295 b 6.8100 c 16.377 β 94.369°heptakis(μ-oxalato)-bis(μ-sulfato)-tetradecaaqua-hexa-neodymium dihydrateNd6(SO4)2(C2O4)7(H2O)14·H2OtriclinicPa=6.0817 b=11.8807 c=16.0749 α=73.230° β=80.873° γ=88.976°N,N'-dimethylethane-1,2-diaminium tetrakis(μ-sulfato)-tris(μ-oxalato)-octaaqua-tetra-neodymium[C4H14N2]·Nd4(SO4)4(C2O4)3(H2O)8triclinicPa=7.0649 b=11.2771 c=11.8318 α=67.370° β=80.035° γ=82.821°bis(μ3-Sulfato-O,O,O',O'',O''')-(μ2-oxalato-O,O',O'',O''')-(μ2-piperazine-diium-1,4-diacetato-O,O')-diaqua-di-neodymium(iii)Nd2(H2pda)(C2O4)(SO4)2(H2O)2]monoclinicC2/ca=19.702 b=6.348 c=17.352 β=109.973°bis(1,4-Diazoniabicyclo[2.2.2]octane) tetrakis(μ2-oxalato-O,O',O'',O''')-tetrakis(μ2-sulfato-O,O',O'')-octa-aqua-tetra-neodymium(iii) dihydrate[C6N2H14][Nd2(C2O4)2(SO4)2(H2O)4]·H2OmonoclinicP21/ca=8.523 b=28.628 c=9.306 β=96.497°(μ4-Piperazine-diium-1,4-diacetato-O,O',O'',O''')-bis(μ3-sulfato-O,O',O'')-(μ2-oxalato-O,O',O'',O''')-diaqua-di-europium(iii) dihydrateEu2(H2pda)(C2O4)(SO4)2(H2O)2 · 2H2OmonoclinicC2/ca=19.143 b=6.722 c=16.323 β=94.58°(μ5-Oxalato)-(μ3-sulfato)-(μ2-aqua)-aqua-europium-silverAgEu(μ5-C2O4)(SO4)(H2O)2monoclinicP21/ca=6.627 b=13.848 c=8.983 β=96.985°tetrakis(μ2-oxalato)-bis(μ2-sulfato)-dodeca-aqua-tetra-erbium monohydrateEr4(SO4)2(C2O4)4(H2O)12·H2OmonoclinicP21/ca=10.5598 b=12.8404 c=12.0835 β=93.327°bis(μ3-sulfato)-bis(μ2-oxalato)-diaqua-di-samarium diammonium[NH4][Sm(H2O)(SO4)(C2O4)]monoclinicP21/na=6.619 b=8.660 c=13.853 β=93.30°(μ5-Oxalato)-(μ3-sulfato)-(μ2-aqua)-aqua-samarium-silverAgSm(μ5-C2O4)(SO4)(H2O)2monoclinicP21/ca=6.630 b=13.829 c=9.001 β=97.128°(NH4)[Gd(C2O4)(SO4)(H2O)]large magnetocaloric effectK[Gd(C2O4)(SO4)(H2O)]monoclinicP21/ca = 6.5849 b = 8.5660 c = 14.7660(2) Å, β = 112.470° Z=4769.663.439colourlesspotassium aquaterbium(III) oxalate sulfateKTb(C2O4)(SO4)(H2O)monoclinica = 6.527 b = 8.507 c = 14.591 β = 112.65° Z=4747.7at 113K; colourless(μ6-Oxalato)-(μ4-oxalato)-bis(μ3-sulfato)-diaqua-di-silver-di-terbiumAgTb(μ4-C2O4)0.5(μ6-C2O4)0.5(SO4)(H2O)monoclinicC2/ma=13.693 b=6.889 c=9.0885 β=116.73°(μ6-Oxalato)-(μ4-oxalato)-bis(μ3-sulfato)-diaqua-di-dysprosium-di-silverAgDy(μ4-C2O4)0.5(μ6-C2O4)0.5(SO4)(H2O)monoclinicC2/ma=13.683 b=6.881 c=9.080 β=116.731°bis(1-ethyl-3-methyl-1H-imidazol-3-ium) (μ-oxalato)-bis(μ-sulfato)-tetraoxo-di-uranium monohydratemonoclinicP21/ca=11.579 b=17.312 c=13.694 β=108.178°yellow(NH4)4[(UO2)2(C2O4)(SO4)2(NCS)2]⋅6H2O orthorhombicPbama = 12.0177 b = 18.6182 c = 6.757 Z=2Tetrapotassium bis(μ2-oxalato)-tetraoxo-bis(sulfato)-di-uranium(vi) hexahydrateK2[UO2(C2O4)SO4] · 3H2OtriclinicPa=5.743 b=9.544 c=11.845 α=89.49° β=84.95° γ=83.01°K4[(UO2)2C2O4(SO4)2(NCS)2]orthorhombicPbama = 11.5548 b = 7.0847 c = 13.5172 β = 93.130° Z=21104.90Di-rubidium dioxo-(oxalato-O,O')-(μ3-sulfato)-uranium monohydrateRb2[UO2SO4(C2O4)] · H2OorthorhombicPna21a=9.720 b=17.037 c=6.852Rb4[(UO2)2C2O4(SO4)2(NCS)2]orthorhombicPbama = 11.5854 b = 7.3841 c = 13.9072 β = 95.754 V = Z=21183.7 Cs4[(UO2)2(C2O4)(SO4)2(NCS)2] · 4H2OorthorhombicPbama = 11.6539 b = 18.379 c = 6.7216 Z=2Tetracesium dioxo-bis(oxalato-O,O')-(sulfato-O)-uranium(vi) hydrateCs4[UO2(C2O4)2SO4] · 2.7H2OorthorhombicPbcaa=9.546 b=21.119 c=21.499
References