Tellurite tellurate explained

A tellurite tellurate is 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.

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. 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-.

Production

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

Properties

Tellurite tellurate compounds can crystalize under certain conditions. Monoclinic and orthorhombic dominate crystal structures of the tellurite tellurates. Most compounds are transparent from near ultraviolet to the 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	ratioTeO3: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		^[1]
	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		^[2] ^[3]
	K4[Te<sub>5</sub><sup>6+</sup>Te<sub>3</sub><sup>4+</sup>]O23	3:5	1545.18	orthorhombic	Pna21	a = 19.793, b = 14.664, c = 7.292, Z = 4				^[4]
Carlfriesite	Ca[Te<sup>4+</sup><sub>2</sub>Te<sup>6+</sup>O<sub>8</sub>]	2:1	550.87	monoclinic	C2/c	a=12.576 b=5.662 c=9.884 β=115.56		6.3
	K4V6[Te<sub>2</sub><sup>4+</sup>Te<sup>6+</sup>]O24	2:1	1228.83	trigonal	Rc	a = 9.7075, c = 42.701, Z = 6	3484.9			^[5]
	Co^2+6(Te^6+O6)(Te^4+O3)2Cl2	2:1	999.30	tetragonal	P42/mbc	a = 8.59 c = 5.91				^[6]
	Rb4[Te<sub>5</sub><sup>6+</sup>Te<sub>3</sub><sup>4+</sup>]O23	3:5	1730.66	orthorhombic	Pna21	a = 19.573, b = 14.448, c = 7.273, Z = 4
	Rb4V6[Te<sub>2</sub><sup>4+</sup>Te<sup>6+</sup>]O24	2:1	1414.31	trigonal	Rc	a = 9.8399, c = 43.012, Z = 6	3606.6
	Sr[Te<sup>4+</sup><sub>2</sub>Te<sup>6+</sup>O<sub>8</sub>]	2:1	598.42	tetragonal	P42/m	a=6.8321 c=6.7605
	SrCuTe2O7	1:1	518.36	orthorhombic	Pbcm	a = 7.1464, b = 15.061, c = 5.4380, Z = 4	585.3			^[7]
	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		^[8]
	RbTe1·25Mo0·75O6					a=10.469				^[9]
	(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
	Ag2[Te<sup>4+</sup>Te<sup>6+</sup>O<sub>6</sub>]	1:1	566.93	monoclinic	P21/m	a=5.4562 b=7.4009 c=6.9122 β=101.237
	Ag2[Te<sup>4+</sup><sub>2</sub>Te<sup>6+</sup><sub>2</sub>O<sub>11</sub>]	2:2	902.13	triclinic	P	a=7.287 b=7.388 c=9.686 α=95.67 β=94.10 γ=119.40
	Cd2Te^4+Te^6+O7	1:1	592.02	monoclinic	P21/c	a=9.3039 b=7.3196 c=13.2479 β=122.914
	Cs2Te^4+Te3^6+O12	1:3	968.20	rhombohedral	Rm	a=7.2921 c=18.332				^[10]
	CsTe2O6–x	1:1	484.10	cubic
	CsTe2O6–x	1:1	484.10	orthorhombic
	BaTe2O6	1:1	488.52	orthorhombic	Cmcm	a=5.569 b=12,796 c=7.320 Z=4		6.19		^[11]
	BaMgTe2O7	1:1	528.83	orthorhombic	Ama2	a = 5.558, b = 15.215, c = 7.307 Z = 4	617.9		SHG 5 × KDP	^[12]
	CsTe1·13Mo0·864O6					a=10.643
	BaCoTeO3TeO4	1:1	563.46	orthorhombic	Ama2					^[13]
	BaCuTeO3TeO4	1:1	568.07	orthorhombic	Ama2	a = 5.4869, b =15.412, c = 7.2066, Z = 4.	609.42			^[14]
	BaZnTe2O7		569.91	orthorhombic	Ama2	a = 5.5498, b = 15.316, c = 7.3098, Z = 4	621.34		SHG 5 × KDP
	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
	NdV3Te3O15(OH)3·H2O		983.86	hexagonal	P63/mmc	a=12.1075 c=12.4572 Z=4	1581.5	4.132	dark red
	SmV3Te3O15(OH)3·H2O		989.97	hexagonal	P63/mmc	a=12.1068 c=12.4509 Z=4	1580.5	4.160	dark red
	EuV3Te3O15(OH)3·H2O		991.58	hexagonal	P63/mmc	a=12.0731 c=12.3674 Z=4	1561.2	4.219	dark red
	GdV3Te3O15(OH)3·H2O		996.87	hexagonal	P63/mmc	a=12.0745 c=12.3701 Z=4	1561.9	4.239	dark red
	RbTe1·5W0·5O6					a=10.462
	CsTe1·625W0·375O6					a=10.543
	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
	PbCuTe2O7	1:1	637.94	orthorhombic	Pbcm	a = 7.2033, b = 15.047, c = 5.4691, Z = 4	592.78
	Bi[(Bi<sup>3+</sup>Te<sup>4+</sup>)Te<sup>6+</sup>O<sub>8</sub>]		801.16
	(Ca,Pb)3CaCu6[Te<sup>4+</sup><sub>3</sub>Te<sup>6+</sup>O<sub>12</sub>]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]

Notes and References

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17. https://www.mindat.org/min-3983.html