Octachlorotetraphosphazene
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Octachlorotetraphosphazene is an inorganic compound with the formula (NPCl2)4. The molecule has a cyclic, unsaturated backbone consisting of alternating phosphorus and nitrogen centers, and can be viewed as a tetramer of the hypothetical compound N≡PCl2.
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Names | |||
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IUPAC name
2,2,4,4,6,6,8,8-Octachloro-1,3,5,7,2λ5,4λ5,6λ5,8λ5-tetrazatetraphosphocine
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Other names
Phosphonitrilic chloride tetramer
Octachlorocyclotetraphosphazene Tetraphosphonitrilic chloride 2,2,4,4,6,6,8,8-octachloro-2,2,4,4,6,6,8,8-octahydro-1,3,5,7,2,4,6,8-tetraazatetraphosphocine 2,2,4,4,6,6,8,8-octachloro-1,3,5,7-tetraza-2λ5,4λ5,6λ5,8λ5-tetraphosphacycloocta-1,3,5,7-tetraene | |||
Identifiers | |||
3D model (JSmol)
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ChEMBL | |||
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EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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Properties | |||
N4Cl8P4 | |||
Molar mass | 463.55 g/mol | ||
Appearance | Colorless solid | ||
Density | 2.27 g/mL at -173 °C | ||
Melting point | 123 to 124 °C (253 to 255 °F; 396 to 397 K) | ||
Boiling point | 188 °C at 15 Torr | ||
Decomposes | |||
Solubility in hexane | 7.0 g/100g (20 °C) | ||
Solubility in toluene | 1.8 g/100g (20 °C) | ||
Solubility in CCl4 | 1.6 g/100g (20 °C) | ||
Refractive index (nD)
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1.675 (589 nm) | ||
Structure | |||
Tetragonal | |||
86 | |||
D4h | |||
0.39 D | |||
Thermochemistry | |||
Std enthalpy of
formation (ΔfH⦵298) |
-1084.9 kJ·mol−1 | ||
Enthalpy of vaporization (ΔfHvap)
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64.9 kJ·mol−1 (325 °C) | ||
Enthalpy of sublimation (ΔfHsublim)
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95.9–97.5 kJ·mol−1 | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards
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Mild irritant | ||
GHS labelling: | |||
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Danger | |||
H314 | |||
P260, P280, P304+P340, P305+P351+P338, P363 | |||
Flash point | Non-flammable | ||
Related compounds | |||
Related compounds
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Hexachlorophosphazene | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The compound has not been studied as much as the related species hexachlorotriphosphazene, in the samples of which octachlorotetraphosphazene is usually found as an unwanted contamintant.[1]
Structure and bonding
editOctachlorotetraphosphazene has a P4N4 core with six equivalent P–N bonds.[2]
Synthesis
edit- NH4Cl + PCl5 → 1/n (NPCl2)n + HCl
Reactions
editSubstitution at P
editSome spiro-, ansa-, and spiro-ansa-cyclic derivatives have been prepared via nucleophilic substitution of octachlorotetraphosphazene with alkoxides.[3]
References
edit- ^ Allcock, H. R. (1972). Phosphorus-nitrogen compounds ; cyclic, linear, and high polymeric systems. New York: Academic Press. ISBN 978-0-323-14751-4. OCLC 838102247.
- ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- ^ Ture, Sedat (2016-01-02). "Synthesis and characterization of spiro-, ansa-, and spiro-ansa-cyclic derivatives of cyclotetraphosphazene with the reactions of pentane-1,5-diol". Phosphorus, Sulfur, and Silicon and the Related Elements. 191 (1): 129–139. doi:10.1080/10426507.2015.1054483.