Phosphinous acid

Last updated
Phosphinous acid
H2POH.png
Names
Other names
hydroxyphosphine
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/H3OP/c1-2/h1H,2H2
    Key: RYIOLWQRQXDECZ-UHFFFAOYSA-N
  • OP
Properties
H3OP
Molar mass 49.997 g·mol−1
Related compounds
Related compounds
 Hydroxylamine
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Phosphinous acid is the inorganic compound with the formula H2POH. It exists, fleetingly, as a mixture with its less stable tautomer H3PO (phosphine oxide). This mixture has been generated by low temperature oxidation of phosphine with ozone. [1] H2POH is mainly of pedagogical interest. Organophosphinous acids are more prevalent than the parent H2POH.

Organophosphinous acids

Phosphinous acids exist mainly as minor tautomers of secondary phosphine oxides. For example diphenylphosphinous acid, which is not detectable directly, is invoked as the tautomer of diphenylphosphine oxide.

Highly electron-withdrawing substituents stabilize the phosphinous acid tautomer as illustrated by (CF3)2POH. [2]

References

  1. ↑ Withnall, Robert; Andrews, Lester (1987). "FTIR spectra of the photolysis products of the phosphine-ozone complex in solid argon". Journal of Physical Chemistry. 91 (4): 784–97. doi:10.1021/j100288a008.
  2. ↑ Bader, Julia; Berger, Raphael J. F.; Stammler, Hans-Georg; Mitzel, Norbert W.; Hoge, Berthold (2011). "First Solid-State Structures of Real Diorganyl Phosphinous Acids R2POH (R=CF3, C2F5)". Chemistry - A European Journal. 17 (48): 13420–13423. doi:10.1002/chem.201102370. PMID   22052837.
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