Selenate selenite

A selenate selenite is a chemical compound or salt that contains selenite and selenate anions (SeO₃^2- and SeO₄^2-). These are mixed anion compounds. Some have third anions.

Naming

A selenate selenite compound may also be called a selenite selenate.

Production

One way to produce a selenate selenite compound is to evaporate a water solution of selenate and selenite compounds.^[1]

Properties

On heating, selenate selenites lose SeO₂ and O₂ and yield selenites, and ultimately metal oxides.^[2]

Related

Related to these are the sulfate sulfites and tellurate tellurites. They can be classed as mixed valent compounds.

List

name	formula	ratio SeO4:SeO3	mw	system	space group	unit cell Å	volume	density	properties	references
Boroseleniteselenate	B2Se3O10	1:2		monoclinic	P21/c	a = 4.3466, b = 7.0237, c = 22.1460, β = 94.922°, Z = 4			colourless hygroscopic	[3]
	Na2(SeO4)(H2SeO3)· H2O	1:1		orthorhombic	Cmc21	a=9.615, b=11.19, c=9.62 Z=4				[4]
	Sc2(SeO3)2(SeO4)	1:2		monoclinic	P21/c	a = 6.5294, b = 10.8557, c = 12.6281, β = 103.543° Z = 4	870.21			[5]
	Sc2(TeO3)(SeO3)(SeO4)	1:1		monoclinic	P21/c	a = 6.535, b = 10.970, c = 12.559, β = 102.70° Z = 4	878.3			[5]
	Fe(SeO4)(HSeO3)· H2O	1:1		monoclinic	P21/c	a=8.355,b=8.696,c=9.255, β=93.72°,Z=4	670.95			[6]
Lithium sequicopper selenite selenate	Li2Cu3(SeO3)2(SeO4)2	2:2		monoclinic	I2/a	a=16.293,b=5.007,c=14.448, β = 94.21°, Z=4	1175.5			[7]
	RbFe(SeO3)(SeO4)	1:1				a=5.339, c=41.206, Z=6	1040.2			[8]
	Y2(SeO3)2(SeO4)(H2O)2·(H2O)0.75	1:2		monoclinic	C2/c	a=11.9118 b=6.8886 c=12.9644 β=103.839°			UV cut off 211 nm
	Zr(SeO3)(SeO4)	1:1		orthorhombic	Pbca	a = 8.291, b = 9.458, c = 15.357, Z = 8	1204.2			[9]
	Zr4(SeO3)(SeO4)7	7:1		monoclinic	P21/n	a = 5.313, b = 10.704, c = 10.484, β = 104.13°, Z = 1	578.2			[9]
	Zr3(SeO3)(SeO4)5·2H2O	5:1		triclinic	P1	a = 5.273, b = 8.079, c = 11.959, α = 82.60°, β = 88.27°, γ = 89.87°, Z = 1	505.1			[9]
	Ag4(Mo2O5)(SeO4)2(SeO3)	2:1		orthorhombic	Pbcm	a=5.6557, b=15.8904, c=15.7938, Z=4	1419.4			[10]
tricadmium(II) bis-[selenite(IV)] selenate(VI)	Cd3(SeO3)2(SeO4)	1:2		monoclinic	P21	a=8.302 b=5.337 c=10.843 β =108.641 Z=2	876.32	4.539	SHG 0.6×KDP; stable to 482 °C	[2]
	(NH4)4Cd(HSeIVO3)2(SeVIO4)2	2:2		triclinic	P1	a = 5.791 b = 7.411 c = 10.736 α = 90.05° β = 105.02° γ = 112.61°	408.2			[11]
	La2(HSeO3)(SeO4)· 2H2O	1:1		monoclinic	P21/n	a=7.272 b=9.409 c=11.940 β =93.32°				[1]
	NaLa(SeO3)(SeO4)	1:1		monoclinic	P21/c	a=10.751 b=7.098 c=8.437 β =90.90°				[1]
	Pr4(SeO3)2(SeO4)F6	1:6		monoclinic	C2/c	a = 22.305, b = 7.1054, c = 8.356, β = 98.05°, Z = 4			light green	[12]
dineodymium diseleite selenate	Nd2(SeO3)2(SeO4) · 2H2O	1:2	721.39	monoclinic	C2/c	a = 12.276, b = 7.0783, c = 13.329, β = 104.276°	1122.4	4.27	pink	[13]
	NaSm(SeO3)(SeO4)	1:1		monoclinic	P21/c	a = 10.669, b = 6.9166, c = 8.2588, β = 91.00° Z = 4			light yellow	[1]
	Er2(SeO3)2(SeO4) · 2H2O	1:2		monoclinic	C2	a=11.935 b=6.881 c=6.473 β =103.79° Z=4				[1][14]
	Hf(SeO3)(SeO4)(H2O)4	1:1								[15]
	Au2(SeO3)2(SeO4)	1:2		orthorhombic	Cmc21	a = 16.891, b = 6.3013, c = 8.327, Z = 4	886.2		orange yellow	[16]
	Hg3(SeO3)2(SeO4)	1:2		monoclinic	P21	a = 8.3979 b = 5.3327 c = 11.148 β = 108.422° Z = 2	473.67		colourless	[17]
	Hg3Se(SeO3)(SO4)			monoclinic	P21/n	a=7.1188 b=9.9209 c=12.4565 β=95.398° Z=4	875.84	6.854	colourless; band gap 3.5 eV; birefringence 0.069@546 nm	[18]
	Hg5O(SeO3)(SeO4)	1:1	1288.87		C2/c	a=17.563 b=6.188 c=18.912 β =90.379 Z=8	2055.2	8.331	yellow	[19]
	Hg3Hg2Hg(HgO2)(SeO3)2(SeO4)·H2O	1:2			R3	a=5.9239 c=37.096 Z=3				[20]
	Hg3Hg2Hg2(HgO2)(SeO3)2(SeO4)2·H2O	2:1			P31c	a=5.8908 c=31.048 Z=2				[20]
	Ag4Hg(SeO3)2(SeO4)	1:2	1028.95	orthorhombic	Cmc21	a=8.1690 b=11.9903 c=10.8870 Z=4	1066.4	6.409	398 nm cutoff NLO 0.35×KDP	[21]
	Pb2(SeO3) (SeO4)	1:1	684.30	orthorhombic	Pnma	a=13.5080 b=5.6238 c=9.2706 Z=4	704.25	6.454	stable to 232 °C	[2]
schmiederite	Pb2Cu2(OH)4(SeO3)(SeO4)	1:1		monoclinic	P21/m	a = 9.922, b = 5.712, c = 9.396, β = 101.96°, Z = 2				[22]
	Bi2(SeO3)2(SeO4)	1:2	814.84	monoclinic	I2/a	a= 8.0440 b=7.4377 c=14.7456 β =97.274 Z=4	875.11	6.184	colourless	[23]
	Ag2Bi2(SeO3)3(SeO4)	1:3	1157.54	monoclinic	P21/m	a=9.5380 b=5.4965 c=11.8207 β =92.892 Z=2	618.92	6.211	339 nm cutoff	[21]
	Th(SeO3)(SeO4)	1:1		monoclinic	P21/c	a=7.0351 b=9.5259 c=9.02266 β =103.128, Z=4				[24]
	(H3O)[(UO2)(SeO4)(SeO2OH)]	1:1		monoclinic	P21/n	a = 8.668, b = 10.655, c = 9.846, β = 97.88°	900.7			[25]
	[C5H14N][(UO2)(SeO4)(SeO2OH)]	1:1		monoclinic	P21/n	a=11.553, b=10.645, c=12.138, β=108.05, Z=4				[26]
	[C5H14N]4[(UO2)3(SeO4)4(HSeO3)(H2O)]·(H2SeO3)(HSeO4)	5:2		triclinic	P1	a = 11.7068, b = 14.816, c = 16.977, α = 73.899°, β = 76.221°, γ = 89.361°, Z = 2	2743.0			[27]
catena-(bis(Dimethylammonium) oxonium tetrakis(μ3-selenato)-(μ2-selenito)-aqua-hexaoxo-tri-uranium selenous acid)	[C2H8N]2[H3O][(UO2)3(SeO4)4(HSeO3)(H2O)](H2SeO3)0.2	4:1.2		monoclinic	P21/m	a 8.3116 b 18.6363 c 11.5623 β =97.582°				[28]
catena-(tris(Dimethylammonium) tetrakis(μ3-selenato)-(μ2-hydrogen selenito)-aqua-hexaoxo-tri-uranium dimethylamine)	[C2H8N]3(C2H7N)[(UO2)3(SeO4)4(HSeO3)(H2O)]	4:1		orthorhombic	Pnma	a =11.659 b =14.956 c =22.194				[28]
	[NH3(CH2)9NH3][(UO2)(SeO4)(SeO2OH)](NO3)	1:1		triclinic	P1	a = 10.7480, b = 13.8847, c = 14.636, α = 109.960°, β = 103.212°, γ = 90.409°, Z= 4	1990.0			[29]
	Cs2(H2O)5[(UO2)7(SeO4)2(SeO3)2O4]. H2O	2:2		monoclinic	P21/m	a =.1381, b =15.0098, c =15.1732 β=91.17°				[30]