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Title: Hexachlorophosphazene  
Author: World Heritage Encyclopedia
Language: English
Subject: Nitrides, Nitrogen heterocycles, Inorganic compounds, Chlorides, Phosphorus
Publisher: World Heritage Encyclopedia


IUPAC name
Other names
Triphosphonitrilic chloride
Phosphonitrilic chloride, Hexachlorocyclotriphosphazene
ChemSpider  YesY
Jmol-3D images Image
Molar mass 347.66 g/mol
Appearance colorless crystals
Density 1.98 g/mL at 25 °C
Melting point 112 to 115 °C (234 to 239 °F; 385 to 388 K)
Boiling point decomposes
Solubility in chlorocarbons soluble
0 D
Main hazards mild irritant
Flash point Non-flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: YesY/N?)

Hexachlorophosphazene is an polyphosphazenes.


  • Synthesis 1
  • Inorganic rings 2
  • "Inorganic rubber" 3
  • See also 4
  • References 5


The reaction of PCl5 and NH4Cl affords substances with the empirical formula PNCl2.[1] Purification by sublimation gives mainly the trimer and tetramer (PNCl2)4. Slow sublimation under vacuum at approximately 60 °C affords the pure trimer, (PNCl2)3, free of the tetramer. These rings were described by Liebig in 1832[2][3] in his study of the reaction of PCl5 and NH3:

PCl5 + NH4Cl → 1/n (NPCl2)n + 4 HCl

Reactions are typically conducted in chlorobenzene solution.

Inorganic rings

Chemists have long known of rings containing carbon, e.g. borazine, S4N4, and the cyclic siloxanes.

"Inorganic rubber"

Hexachlorophosphazene is a precursor to H. N. Stokes in 1896.[2][4][5] Upon heating to ca. 250 °C, the trimer undergoes ring-opening polymerization to give the linear polymer (PNCl2)n. Subsequent replacement of the chloride centers by other groups, especially alkoxides, yields many polyphosphazenes, some with commercial uses.

See also


  1. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  2. ^ a b c H. N. Stokes (1895), On the chloronitrides of phosphorus. American Chemical Journal, vol. 17, p. 275.
  3. ^ Liebig-Wöhler, Briefwechsel vol. 1, 63; Ann. Chem. (Liebig), vol. 11 (1834), 146.
  4. ^ H. N. Stokes (1896), On Trimetaphosphimic acid and its decomposition products. American Chemical Journal, vol. 18 issue 8, p. 629.
  5. ^ Mark, J. E.; Allcock, H. R.; West, R. “Inorganic Polymers” Prentice Hall, Englewood, NJ: 1992. ISBN 0-13-465881-7.
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