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Hydrogen telluride is the inorganic compound with the formula H 2 Te.A hydrogen chalcogenide and the simplest hydride of tellurium, it is a colorless gas.Although unstable in ambient air, the gas can exist long enough to be readily detected by the odour of rotting garlic at extremely low concentrations; or by the revolting odour of rotting leeks at somewhat higher concentrations.
The −2 oxidation state is exhibited in binary compounds with many metals, such as zinc telluride, ZnTe, produced by heating tellurium with zinc. [2] Decomposition of ZnTe with hydrochloric acid yields hydrogen telluride (H 2 Te), a highly unstable analogue of the other chalcogen hydrides, H 2 O, H 2 S and H 2 Se:
The telluride ion is the anion Te 2− and its derivatives. It is analogous to the other chalcogenide anions, the lighter O 2−, S 2−, and Se 2−, and the heavier Po 2−. [1] In principle, Te 2− is formed by the two-e − reduction of tellurium. The redox potential is −1.14 V. [2] Te(s) + 2 e − ↔ Te 2−
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A hydrotelluride or tellanide is an ion or a chemical compound containing the [HTe] − anion which has a hydrogen atom connected to a tellurium atom. HTe is a pseudohalogen . Organic compounds containing the -TeH group are called tellurols .
The acidity of tellurols can be inferred by the acidity and dissociation constant of hydrogen telluride, H 2 Te, which has a (first) pK a of 2.64 corresponding to a dissociation constant of 2.3 × 10 −3. H 2 Te has a lower pK a and higher dissociation constant than H 2 S and H 2 Se. [4] The pKa is 9.3 for (Me 3 Si) 3 CTeH vs 10.8 for (Me 3 Si ...
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Hydride tellurides are mixed anion compounds containing both hydride and telluride ions. They are in the category of heteroanionic chalcogenides , or mixed anion compounds . Related compounds include the oxyhydrides , hydride sulfides , and hydride selenides .