Hydrogen ditelluride
Tellurium, Te Hydrogen, H | |
Names | |
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IUPAC name
Hydrogen ditelluride
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Systematic IUPAC name
Ditellane | |
Other names
ditellane
Dihydrogen ditellanide | |
Identifiers | |
3D model (
JSmol ) |
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ChEBI | |
ChemSpider | |
239518 | |
PubChem CID
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Properties | |
H2Te2 | |
Molar mass | 257.22 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hydrogen ditelluride or ditellane is an unstable
Production
Hydrogen ditelluride can possibly be formed at the tellurium cathode in electrolysis in acid.[2] When electrolysed in alkaline solutions, a tellurium cathode produces ditelluride Te2−2 ions, as well as Te2− and a red polytelluride. The greatest amount of ditelluride is made when pH is over 12.[3]
Apart from its speculative detection in electrolysis, ditellane has been detected in the gas phase produced from di-sec-butylditellane.[1][4]
Properties
Hydrogen ditelluride has been investigated theoretically, with various properties predicted. The molecule is twisted with a C2 symmetry. There are two enantiomers. Hydrogen ditelluride is one of the simplest possible unsymmetrical molecules; any simpler molecule will not have the required low symmetry. The equilibrium geometry (not counting zero point energy or vibrational energy) has bond lengths of 2.879 Å between the tellurium atoms and 1.678 Å between hydrogen and tellurium. The H−Te−Te angle is 94.93°. The angle of lowest energy between the two H−Te bonds (the dihedral angle between the Ha−S−S and S−S−Hb planes) is 89.32°. The trans configuration is higher in energy (3.71 kcal/mol), and the cis would be even higher (4.69 kcal/mol).[5]
Being
The different vibrational modes for H2Te are symmetrical stretch of H−Te, symmetrical bend of H−Te−Te, torsion, stretch Te−Te, asymmetrical stretch H−Te, asymmetrical bend of H−Te−Te.[7] The time to tunnel between enantiomers is only 0.6 ms for 1H2Te2, but is 66000 seconds (18 h 20 min) for the tritium isotopomer T2Te2.[7]
Related
There are organic derivatives, in which the hydrogen is replaced by organic groups. One example is bis(2,4,6-tributylphenyl)ditellane.[8] Others are diphenyl ditelluride and 1,2-bis(cyclohexylmethyl)ditellane.
References
- ^ ISBN 9780412491108.
- .
- S2CID 250901981.
- .
- .
- ISBN 9783319745817.
- ^ .
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