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| Identifiers | |
|---|---|
3D model (JSmol) | |
| ChemSpider |
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| Properties | |
| P 2H 2 | |
| Molar mass | 63.96340 g·mol−1 |
| Related compounds | |
Otheranions | diazene |
Othercations | diphosphenes |
Related Binaryazenes | triazene tetrazene |
Related compounds | ammonia diazane triazane |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Diphosphene is a compound having the formula (PH)2. It exists as twogeometric isomers,E andZ.[1] Diphosphene is also the parent member of the entire class ofdiphosphene compounds with the formula (PR)2, where R is anorganyl group.[2]
Visible radiation induces cis-trans isomerization,[3] although further irradiation can excite the molecule to a tripletdiradical state. In triplet trans-HPPH, the P-P bond length is predicted to be 2.291 Å. It is not only longer than the P-P double bond in ground state trans-bis(2,4,6-tri-tert-butylphenyl)diphosphene, but also longer than that of P-P single bond in H2PPH2. Calculation of the dihedral angle of trans-HPPH suggests that it is almost 90 degree, which means the formation of and P-P bonds is forbidden and σ bond is enhanced.[4]
