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.[1]
Naming
editA 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
editOne 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
editTellurite 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 the near infrared. Te-O bonds cause absorption lines in infrared. Sodium tellurite exhibit
Related
editRelated to these are the selenate selenites and sulfate sulfites by varying the chalcogen.
List
edit| 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[Te56+Te34+]O23 | 3:5 | 1545.18 | orthorhombic | Pna21 | a = 19.793, b = 14.664, c = 7.292, Z = 4 | [7] | ||||
| Carlfriesite | Ca[Te4+2Te6+O8] | 2:1 | 550.87 | monoclinic | C2/c | a=12.576 b=5.662 c=9.884 β=115.56 | 6.3 | [5] | ||
| K4V6[Te24+Te6+]O24 | 2:1 | 1228.83 | trigonal | R3c | a = 9.7075, c = 42.701, Z = 6 | 3484.9 | [8] | |||
| Co2+6(Te6+O6)(Te4+O3)2Cl2 | 2:1 | 999.30 | tetragonal | P42/mbc | a = 8.59 c = 5.91 | [5] | ||||
| Rb4[Te56+Te34+]O23 | 3:5 | 1730.66 | orthorhombic | Pna21 | a = 19.573, b = 14.448, c = 7.273, Z = 4 | [7] | ||||
| Rb4V6[Te24+Te6+]O24 | 2:1 | 1414.31 | trigonal | R3c | a = 9.8399, c = 43.012, Z = 6 | 3606.6 | [8] | |||
| Sr[Te4+2Te6+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[Te4+Te6+O6] | 1:1 | 566.93 | monoclinic | P21/m | a=5.4562 b=7.4009 c=6.9122 β=101.237 | [5] | ||||
| Ag2[Te4+2Te6+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] | ||||
| Cd2Te4+Te6+O7 | 1:1 | 592.02 | monoclinic | P21/c | a=9.3039 b=7.3196 c=13.2479 β=122.914 | [5] | ||||
| Cs2Te4+Te36+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[(Bi3+Te4+)Te6+O8] | 801.16 | [5] | ||||||||
| (Ca,Pb)3CaCu6[Te4+3Te6+O12]2(Te4+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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