Fluorophosphite

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Fluorophosphite
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/FH2O2P/c1-4(2)3/h4H,(H,2,3)/p-1
    Key: ICZWVCDXVPRBMM-UHFFFAOYSA-M
  • [O-][PH](=O)F
Properties
HO2P−
Molar mass 63.980 g·mol−1
Related compounds
Related compounds
 Phosphite; Monofluorophosphate; Difluorophosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Fluorophosphite is an ion with formula HPO2F−. The term is also used for salts contain the fluorophosphite anion.

The conjugate acid is phosphorofluoridous acid, (fluorophosphinic acid or monoflorophosphorous acid),[1] H[PHO2F].[2]

Production

One way to produce is to react phosphonic acid with a fluoride salt in molten urea. This works with potassium and ammonium salts.[3]

H3PO3 + O=C(NH2)2 + MF → M[PHO2F] + 2NH3 + CO2

Pyrophosphite is hydrolysed in a solution containing fluoride ions to fluorophosphite.[4][5]

[H2P2O5]2− + HF → [HPO2F]− + [H2PO2]−

Phosphorus trifluoride combines with a dilute alkali bicarbonate solution to yield fluorophosphite.[6]

A combination of hydrofluoric acid and monopotassium phosphite results in a solvated compound that is not a fluorophospite. Grinding potassium fluoride with phosphorous acid results in the same substance. It has formula KHPHO3•HF. When heated this produces some potassium fluorophosphite, along with potassium pyrophosphite.[7]

KHPHO3•HF → KPFHO2 + H2O ↑

Lithium monofluorophosphite has been made from HF, phosphorus trichloride (PCl3) and lithium chloride, using ether as a solvent.[8]

Reactions

Fluorophosphite is hydrolysed by water to form more phosphite and hydrofluoric acid again.[5] In neutral conditions, the concentration will of fluorophosphite will be similar to phosphite.[6]


Fluorophosphite reacts with phosphate to yield a complex anion mixing PIII and PVI.[6]

PO2H2F + H3PO4 ↔ HF + HP(O)(OH)OP(O)(OH)2

List

formula reference
LiPFHO2 [8]
NH4PFHO2 [3]
KPFHO2 [3]

References

  1. Hudlický, Miloš (1971). "Nomenclature of Organic Fluorine Compounds". Organic Fluorine Chemistry. Springer US. p. 19. doi:10.1007/978-1-4615-8642-5_3. ISBN 978-1-4615-8644-9.
  2. Falius, Hans (September 1970). "Simple Synthesis of Phosphorofluoridous Acid, H[PHO2F]". Angewandte Chemie International Edition in English. 9 (9): 733–734. doi:10.1002/anie.197007332.
  3. Schülke, U.; Kayser, R. (July 1991). "Herstellung von Fluorophosphaten, Difluorophosphaten, Fluorophsophonaten und Fluorophosphiten in fluoridhaltigen Harnstoffschmelzen" [Preparation of Fluorophosphates, Difluorophosphates, Fluorophosphonates,and Fluorophosphites in Fluoride-containing Urea Melts]. Zeitschrift für anorganische und allgemeine Chemie. 600 (1): 221–226. Bibcode:1991ZAACh.600..221S. doi:10.1002/zaac.19916000130.
  4. Mesmer, Robert E.; Carroll, Robert L. (April 1966). "The Kinetics and Mechanism of the Hydrolysis of Pyrophosphite". Journal of the American Chemical Society. 88 (7): 1381–1387. Bibcode:1966JAChS..88.1381M. doi:10.1021/ja00959a010.
  5. Blaser, Bruno; Worms, Karl-Heinz (November 1961). "Über Phosphorsäuren niederer Oxydationszahl. VII. Umanhydrisierungsreaktionen von P-0-P-Sauren, über die P3-O-P4-P4-Säure". Zeitschrift für anorganische und allgemeine Chemie. 312 (3–4): 146–168. doi:10.1002/zaac.19613120304.
  6. Blaser, B.; Worms, K.-H. (July 1968). "Über Phosphorsäuren niederer Oxydationszahl, VIII. Über die monofluorophosphorige Säure". Zeitschrift für anorganische und allgemeine Chemie. 360 (3–4): 117–136. Bibcode:1968ZAACh.360..117B. doi:10.1002/zaac.19683600303.
  7. Falius, Hans; Mootz, Dietrich; Altenburg, Horst (June 1970). "Hydrogen Fluoride-Potassium Hydrogen Phosphite (1/1), an Unusual Lattice Compound". Angewandte Chemie International Edition in English. 9 (6): 459–460. doi:10.1002/anie.197004592.
  8. Dishman, Karla; Karnell, Leigh Ann; Larson, John W. (April 1994). "Kinetics of the acid and alkaline hydrolysis of Monofluorophosphite". International Journal of Chemical Kinetics. 26 (4): 455–459. doi:10.1002/kin.550260407.