Telluride (chemistry)
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3D model (JSmol) |
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ChEBI |
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Gmelin Reference | 6498 |
CompTox Dashboard (EPA) |
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InChI
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Properties | |
Chemical formula | Te2− |
Molar mass | 127.60 g·mol−1 |
Conjugate acid | Hydrogen telluride |
Related compounds | |
Other anions | Sulfide, selenide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
The telluride ion is the anion Te2− and its derivatives. It is analogous to the other chalcogenide anions, the lighter O2−, S2−, and Se2−, and the heavier Po2−.[1]
In principle, Te2− is formed by the two-e− reduction of tellurium. The redox potential is −1.14 V.[2]
- Te(s) + 2 e− ↔ Te2−
Although solutions of the telluride dianion have not been reported, soluble salts of bitelluride (TeH−) are known.[3]
Organic tellurides
Tellurides also describe a class of organotellurium compounds formally derived from Te2−. An illustrative member is dimethyl telluride, which results from the methylation of telluride salts:
- 2 CH3I + Na2Te → (CH3)2Te + 2 NaI
Dimethyl telluride is formed by the body when tellurium is ingested. Such compounds are often called telluroethers because they are structurally related to ethers with tellurium replacing oxygen, although the length of the C–Te bond is much longer than a C–O bond. C–Te–C angles tend to be closer to 90°.[4]
Inorganic tellurides
Many metal tellurides are known, including some telluride minerals. These include natural gold tellurides, like calaverite and krennerite (AuTe2), and sylvanite (AgAuTe4). They are minor ores of gold, although they comprise the major naturally occurring compounds of gold. (A few other natural compounds of gold, such as the bismuthide maldonite (Au2Bi) and antimonide aurostibite (AuSb2), are known). Although the bonding in such materials is often fairly covalent, they are described casually as salts of Te2−. Using this approach, Ag2Te is derived from Ag+ and Te2−. Catenated Te anions are known in the form of the polytellurides. They arise by the reaction of telluride dianion with elemental Te:
- Te2- + n Te → Ten+12-
Applications
Tellurides have no large scale applications aside from cadmium telluride photovoltaics.[5] Both bismuth telluride and lead telluride are exceptional thermoelectric materials.[6][7] Some of these thermoelectric materials have been commercialized.[8][9][10]
References
- ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- ^ "Standard Reduction Potentials" Archived 2013-02-28 at the Wayback Machine, Indiana University.
- ^ Houser, Eric J.; Rauchfuss, Thomas B.; Wilson, Scott R. (1993). "Synthetic and structural studies on (RC5H4)4Ru4E40/2+ (E = sulfur, selenium, tellurium): Mobile metal-metal bonds within a mixed-valence ruthenium (IV)/Ruthenium(III) cluster". Inorganic Chemistry. 32 (19): 4069–4076. doi:10.1021/ic00071a017.
- ^ Reid, G., et al. Journal of Organometallic Chemistry, 642 (2002) 186– 190.
- ^ Wu, Xuanzhi (2004). "High-efficiency polycrystalline Cd Te thin-film solar cells". Solar Energy. 77 (6): 803–814. Bibcode:2004SoEn...77..803W. doi:10.1016/j.solener.2004.06.006.
- ^ Lalonde, Aaron D.; Pei, Yanzhong; Wang, Heng; Jeffrey Snyder, G. (2011). "Lead telluride alloy thermoelectrics". Materials Today. 14 (11): 526–532. doi:10.1016/S1369-7021(11)70278-4.
- ^ Goldsmid, H. (2014). "Bismuth Telluride and Its Alloys as Materials for Thermoelectric Generation". Materials. 7 (4): 2577–2592. Bibcode:2014Mate....7.2577G. doi:10.3390/ma7042577. PMC 5453363. PMID 28788584.
- ^ "Laird Thermo-electric".
- ^ "TeTech".
- ^ "Marlow".
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H2Te -TeH | He | ||||||||||||||||||||
Li2Te | BeTe | B | CTe2 (CH3)2Te | (NH4)2Te | O | F | Ne | ||||||||||||||
Na2Te | MgTe | Al2Te3 | Si | P0.8Te0.2 | S | Cl | Ar | ||||||||||||||
K2Te | CaTe | Sc2Te3 | Ti | VTe2 | CrTe Cr2Te3 | MnTe MnTe2 | FeTe | CoTe | NiTe | Cu2Te CuTe CuTe2 | ZnTe | GaTe Ga2Te3 -Ga | GeTe -Ge | As2Te3 As4Te3 +As | Se | +Br | Kr | ||||
Rb2Te | SrTe | Y2Te3 | ZrTe5 | NbTe2 | MoTe2 | Tc | Ru | Rh | Pd | Ag2Te | CdTe | In2Te3 | SnTe SnTe2 | Sb2Te3 | Te2- Te2- n | I | Xe | ||||
Cs2Te | BaTe | * | LuTe Lu2Te3 | HfTe5 | TaTe2 | WTe2 WTe3 | ReTe2 | Os | Ir | Pt | AuxTey | HgTe | Tl2Te | PbTe | Bi2Te3 | Po | At | Rn | |||
Fr | RaTe | ** | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |||
* | LaTe La2Te3 | CeTe Ce2Te3 | PrTe Pr2Te3 | NdTe Nd2Te3 | Pm | SmTe Sm2Te3 | EuTe Eu2Te3 | GdTe Gd2Te3 | TbTe Tb2Te3 | DyTe Dy2Te3 | HoTe Ho2Te3 | ErTe Er2Te3 | TmTe Tm2Te3 | YbTe Yb2Te3 | |||||||
** | Ac | ThTe2 | Pa | UTe2 | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No |