Octachlorotetraphosphazene
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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 | |||
| 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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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) |
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) |
64.9 kJ·mol−1 (325 °C) | ||
Enthalpy of sublimation (ΔfHsublim) |
95.9–97.5 kJ·mol−1 | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
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 |
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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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.
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
[edit]Octachlorotetraphosphazene has a P4N4 core with six equivalent P–N bonds.[2]
Synthesis
[edit]- NH4Cl + PCl5 → 1/n (NPCl2)n + HCl
Reactions
[edit]Substitution at P
[edit]Some 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. doi:10.1016/C2009-0-30414-6. 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.