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Identifiers | |
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3D model (JSmol) | |
ChemSpider | |
PubChem CID | |
CompTox Dashboard (EPA) | |
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Properties | |
P 2H 2 | |
Molar mass | 63.96340 g·mol−1 |
Related compounds | |
Other anions | diazene |
Other cations | diphosphenes |
Related Binary azenes | triazene tetrazene |
Related compounds | ammonia diazane triazane |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Diphosphene is a compound having the formula (PH)2. It exists as two geometric isomers, E and Z. [1] Diphosphene is also the parent member of the entire class of diphosphene compounds with the formula (PR)2, where R is an organyl group. [2]
Visible radiation induces cis-trans isomerization, [3] although further irradiation can excite the molecule to a triplet diradical 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]