Liquid hydrogen telluride in a test tube
| |
Tellurium, Te Hydrogen, H | |
Names | |
---|---|
IUPAC name
hydrogen telluride
| |
Other names
hydrotelluric acid
tellane tellurium hydride dihydrogen telluride tellurane | |
Identifiers | |
3D model (
JSmol)
|
|
ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.029.073 |
EC Number |
|
PubChem
CID
|
|
UNII | |
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties | |
H2Te | |
Molar mass | 129.6158 g mol−1 |
Appearance | colourless gas |
Odor | Pungent, resembles rotting garlic or leeks |
Density | 3.310 g/L, gas 2.57 g/cm3 (−20 °C, liquid) |
Melting point | −49 °C (−56 °F; 224 K) [1] |
Boiling point | −2.2 °C (28.0 °F; 270.9 K) (unstable above −2 °C) |
0.70 g/100 mL | |
Acidity (pKa) | 2.6 |
Conjugate acid | Telluronium |
Conjugate base | Telluride |
Structure | |
bent | |
Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
0.7684 kJ/g |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
|
toxic |
NFPA 704 (fire diamond) | |
Related compounds | |
Other
anions
|
H2O H2S H2Se H2Po |
Other
cations
|
Na2Te Ag2Te K2Te Rb2Te Cs2Te |
Related compounds
|
telluric acid tellurous acid stibine |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Hydrogen telluride is the inorganic compound with the formula H2 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. Most compounds with Te–H bonds ( tellurols) are unstable with respect to loss of H2. H2Te is chemically and structurally similar to hydrogen selenide, both are acidic. The H–Te–H angle is about 90°. Volatile tellurium compounds often have unpleasant odours, reminiscent of decayed leeks or garlic. [2]
Electrolytic methods have been developed. [3]
H2Te can also be prepared by hydrolysis of the telluride derivatives of electropositive metals. [4] The typical hydrolysis is that of aluminium telluride:
Other salts of Te2− such as MgTe and
sodium telluride can also be used. Na2Te can be made by the reaction of Na and Te in anhydrous
ammonia.
[5] The intermediate in the hydrolysis, HTe−
, can be isolated as salts as well. NaHTe can be made by reducing tellurium with
NaBH
4.
[5]
Hydrogen telluride cannot be efficiently prepared from its constituent elements, in contrast to H2Se. [3]
H
2Te is an
endothermic compound, degrading to the elements at room temperature:
Light accelerates the decomposition. It is unstable in air, being oxidized to water and elemental tellurium: [6]
It is almost as acidic as phosphoric acid (Ka = 8.1×10−3), having a Ka value of about 2.3×10−3. [6] It reacts with many metals to form tellurides. [7]
Liquid hydrogen telluride in a test tube
| |
Tellurium, Te Hydrogen, H | |
Names | |
---|---|
IUPAC name
hydrogen telluride
| |
Other names
hydrotelluric acid
tellane tellurium hydride dihydrogen telluride tellurane | |
Identifiers | |
3D model (
JSmol)
|
|
ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.029.073 |
EC Number |
|
PubChem
CID
|
|
UNII | |
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties | |
H2Te | |
Molar mass | 129.6158 g mol−1 |
Appearance | colourless gas |
Odor | Pungent, resembles rotting garlic or leeks |
Density | 3.310 g/L, gas 2.57 g/cm3 (−20 °C, liquid) |
Melting point | −49 °C (−56 °F; 224 K) [1] |
Boiling point | −2.2 °C (28.0 °F; 270.9 K) (unstable above −2 °C) |
0.70 g/100 mL | |
Acidity (pKa) | 2.6 |
Conjugate acid | Telluronium |
Conjugate base | Telluride |
Structure | |
bent | |
Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
0.7684 kJ/g |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
|
toxic |
NFPA 704 (fire diamond) | |
Related compounds | |
Other
anions
|
H2O H2S H2Se H2Po |
Other
cations
|
Na2Te Ag2Te K2Te Rb2Te Cs2Te |
Related compounds
|
telluric acid tellurous acid stibine |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Hydrogen telluride is the inorganic compound with the formula H2 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. Most compounds with Te–H bonds ( tellurols) are unstable with respect to loss of H2. H2Te is chemically and structurally similar to hydrogen selenide, both are acidic. The H–Te–H angle is about 90°. Volatile tellurium compounds often have unpleasant odours, reminiscent of decayed leeks or garlic. [2]
Electrolytic methods have been developed. [3]
H2Te can also be prepared by hydrolysis of the telluride derivatives of electropositive metals. [4] The typical hydrolysis is that of aluminium telluride:
Other salts of Te2− such as MgTe and
sodium telluride can also be used. Na2Te can be made by the reaction of Na and Te in anhydrous
ammonia.
[5] The intermediate in the hydrolysis, HTe−
, can be isolated as salts as well. NaHTe can be made by reducing tellurium with
NaBH
4.
[5]
Hydrogen telluride cannot be efficiently prepared from its constituent elements, in contrast to H2Se. [3]
H
2Te is an
endothermic compound, degrading to the elements at room temperature:
Light accelerates the decomposition. It is unstable in air, being oxidized to water and elemental tellurium: [6]
It is almost as acidic as phosphoric acid (Ka = 8.1×10−3), having a Ka value of about 2.3×10−3. [6] It reacts with many metals to form tellurides. [7]