Tellurite tellurate

A tellurite tellurate is a chemical compound or salt that contains tellurite and tellurate anions [TeO₃]^2- [TeO₄ ]^2-. These are mixed anion compounds, meaning the compounds are cations that contain one or more anions. Some have third anions. Environmentally, tellurite [TeO₃]^2- is the more abundant anion due to tellurate's [TeO₄ ]^2- low solubility limiting its concentration in biospheric waters. Another way to refer to the anions is tellurium's oxyanions, which happen to be relatively stable.^[1]

Naming

A tellurite tellurate compound may also be called a tellurate tellurite. Compounds that contain the anions follow basic nomenclature rules, the cation is named first, followed by the anion.^[2] As individual ions current IUPAC naming conventions dictate that compounds containing what was conventionally known as the tellurite ion, [TeO₃]^2-, be named as tellurate (IV) compounds, while other tellurates are labeled tellurate (VI) compounds. Furthering confusion, a number of other tellurate oxyanions exist, including pentoxotellurate, [TeO₅]^4-, and ditellurate, [Te₂O₁₀]^8-. Additionally, a number of compounds that do not even include tellurium oxyanions still have "tellurate" in their names, as in the case of octafluoridotellurate, [TeF₈]^2-.^[3]

Production

One way to produce a tellurite tellurate compound is by heating oxides together.^[4] Tellurite tellurate compounds can also occur naturally as minerals such as Carlfriesite Ca[Te⁴⁺₂Te⁶⁺O₈].^[5]

Properties

Tellurite tellurate compounds can crystalize under certain conditions. Monoclinic and orthorhombic dominate crystal structures of the tellurite tellurates.^[5] Most compounds are transparent from near ultraviolet to near infrared. Te-O bonds cause absorption lines in infrared. Sodium tellurite exhibit

Related

Related to these are the selenate selenites and sulfate sulfites by varying the chalcogen.

List

name	formula	ratio TeO3:TeO4	mw	system	space group	unit cell Å	volume	density	optical	references
	NH4Te2O5(OH)	1:1	370.24	orthorhombic	Pnma	a=7.340 b=5.546 c=13.164 Z=4	535.9	4.50		[6]
	K2Te4O12	1:3	780.59	monoclinic	C2/m	a=12.360 b=7.248 c=11.967 β =105.68 Z=4	1032.2	5.03		[4][1]
	K4[Te5^6+Te3^4+]O23	3:5	1545.18	orthorhombic	Pna21	a = 19.793, b = 14.664, c = 7.292, Z = 4				[7]
Carlfriesite	Ca[Te^4+2Te^6+O8]	2:1	550.87	monoclinic	C2/c	a=12.576 b=5.662 c=9.884 β=115.56		6.3		[5]
	K4V6[Te2^4+Te^6+]O24	2:1	1228.83	trigonal	R3c	a = 9.7075, c = 42.701, Z = 6	3484.9			[8]
	Co^2+6(Te^6+O6)(Te^4+O3)2Cl2	2:1	999.30	tetragonal	P42/mbc	a = 8.59 c = 5.91				[5]
	Rb4[Te5^6+Te3^4+]O23	3:5	1730.66	orthorhombic	Pna21	a = 19.573, b = 14.448, c = 7.273, Z = 4				[7]
	Rb4V6[Te2^4+Te^6+]O24	2:1	1414.31	trigonal	R3c	a = 9.8399, c = 43.012, Z = 6	3606.6			[8]
	Sr[Te^4+2Te^6+O8]	2:1	598.42	tetragonal	P42/m	a=6.8321 c=6.7605				[5]
	SrCuTe2O7	1:1	518.36	orthorhombic	Pbcm	a = 7.1464, b = 15.061, c = 5.4380, Z = 4	585.3			[9]
	NaYTe2O7	1:1	479.10	monoclinic	P21/n	a=6.7527 b=7.5077 c=11.8867 β =99.935 Z=4	593.59	5.361		[10]
	RbTe1·25Mo0·75O6					a=10.469				[11]
	(Ag,Na)2Te4O15 x=0.4	2:2		monoclinic	P21/c	a = 6.333, b = 24.681, c = 7.308, β = 110.84° Z = 4				[4]
	Ag2[Te^4+Te^6+O6]	1:1	566.93	monoclinic	P21/m	a=5.4562 b=7.4009 c=6.9122 β=101.237				[5]
	Ag2[Te^4+2Te^6+2O11]	2:2	902.13	triclinic	P1	a=7.287 b=7.388 c=9.686 α=95.67 β=94.10 γ=119.40				[5]
	Cd2Te^4+Te^6+O7	1:1	592.02	monoclinic	P21/c	a=9.3039 b=7.3196 c=13.2479 β=122.914				[5]
	Cs2Te^4+Te3^6+O12	1:3	968.20	rhombohedral	R3m	a=7.2921 c=18.332				[12]
	CsTe2O6–x	1:1	484.10	cubic						[12]
	CsTe2O6–x	1:1	484.10	orthorhombic						[12]
	BaTe2O6	1:1	488.52	orthorhombic	Cmcm	a=5.569 b=12,796 c=7.320 Z=4		6.19		[5][2]
	BaMgTe2O7	1:1	528.83	orthorhombic	Ama2	a = 5.558, b = 15.215, c = 7.307 Z = 4	617.9		SHG 5 × KDP	[13]
	CsTe1·13Mo0·864O6					a=10.643				[11]
	BaCoTeO3TeO4	1:1	563.46	orthorhombic	Ama2					[14]
	BaCuTeO3TeO4	1:1	568.07	orthorhombic	Ama2	a = 5.4869, b =15.412, c = 7.2066, Z = 4.	609.42			[3]
	BaZnTe2O7		569.91	orthorhombic	Ama2	a = 5.5498, b = 15.316, c = 7.3098, Z = 4	621.34		SHG 5 × KDP	[13]
	CeV3Te3O15(OH)3·2H2O		995.74	hexagonal	P63/mmc	a=12.166 c=12.537 Z=4	1606.9	4.116	dark red	[15]
	PrV3Te3O15(OH)3·2H2O		996.53	hexagonal	P63/mmc	a=12.1147 c=12.4949 Z=4	1588.1	4.168	dark red	[15]
	NdV3Te3O15(OH)3·H2O		983.86	hexagonal	P63/mmc	a=12.1075 c=12.4572 Z=4	1581.5	4.132	dark red	[15]
	SmV3Te3O15(OH)3·H2O		989.97	hexagonal	P63/mmc	a=12.1068 c=12.4509 Z=4	1580.5	4.160	dark red	[15]
	EuV3Te3O15(OH)3·H2O		991.58	hexagonal	P63/mmc	a=12.0731 c=12.3674 Z=4	1561.2	4.219	dark red	[15]
	GdV3Te3O15(OH)3·H2O		996.87	hexagonal	P63/mmc	a=12.0745 c=12.3701 Z=4	1561.9	4.239	dark red	[15]
	RbTe1·5W0·5O6					a=10.462				[11]
	CsTe1·625W0·375O6					a=10.543				[11]
	α-Hg2Te2O7	1:1	768.38	monoclinic	C2/c	a=12.910 b=7.407 c=13.256 β =112.044 Z=8				[16]
	β-Hg2Te2O7	1:1	768.38	orthorhombic	Aea2	a=7.441, b=23.713 ,c=13.522, Z=16				[16]
	PbCuTe2O7	1:1	637.94	orthorhombic	Pbcm	a = 7.2033, b = 15.047, c = 5.4691, Z = 4	592.78			[9]
	Bi[(Bi^3+Te^4+)Te^6+O8]		801.16							[5]
	(Ca,Pb)3CaCu6[Te^4+3Te^6+O12]2(Te^4+O3)2(SO4)2		3111.30	trigonal	P3 2 1	a=9.1219(17), c=11.9320(9)		4.65	Viridian green	[17]

References

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