Diphosphene

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Diphosphene
Ball and stick model of diphosphene molecule Diphosphene.png
Ball and stick model of diphosphene molecule
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/H2P2/c1-2/h1-2H Yes check.svgY
    Key: SWJAOBXRZSMKNS-UHFFFAOYSA-N Yes check.svgY
  • P=P
Properties
P
2
H
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).
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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]

References

  1. Lu, T.; Simmonett, A. C.; Evangelista, F. A.; Yamaguchi, Y.; Schaefer, H. F. (2009). "Diphosphene and Diphosphinylidene". The Journal of Physical Chemistry A. 113 (47): 13227–13236. Bibcode:2009JPCA..11313227L. doi:10.1021/jp904028a. PMID   19594123.
  2. Yoshifuji, M.; Shibayama, K.; Inamoto, N.; Hirotsu, K.; Higuchi, T. (1983). "Reaction of the diphosphene ArP=PAr (Ar = 2,4,6-But3C6H2) with sulphur: isolation and X-ray structure of the diphosphene monosulphide". Journal of the Chemical Society, Chemical Communications. 1983 (16): 862–863. doi:10.1039/C39830000862.
  3. Caminade, Anne-Marie; Verrier, Martine; Ades, Claude; Paillous, Nicole; Koenig, Max (1984-01-01). "Laser irradiation of a diphosphene: evidence for the first cis–trans isomerization". J. Chem. Soc., Chem. Commun. (13): 875–877. doi:10.1039/c39840000875. ISSN   0022-4936.
  4. Lu, Tongxiang; Hao, Qiang; Simmonett, Andrew C.; Evangelista, Francesco A.; Yamaguchi, Yukio; Fang, De-Cai; Schaefer, Henry F. (2010-10-14). "Low-Lying Triplet States of Diphosphene and Diphosphinylidene". The Journal of Physical Chemistry A. 114 (40): 10850–10856. Bibcode:2010JPCA..11410850L. doi:10.1021/jp105281w. ISSN   1089-5639. PMID   20836526.