五氮化三磷

五氮化三磷
	IUPAC名; Triphosphorus pentanitride
別名	氮化磷; 氮化磷(V)
識別
CAS號	12136-91-3
EINECS	235-233-9
性質
化學式	P3N5
摩爾質量	162.955 g·mol⁻¹
外觀	白色固體
密度	α-P3N5：2.77 g/cm3
熔點	850 °C（1123 K）（分解）
溶解性（水）	不溶
相關物質
相關化學品	一氮化磷
	若非註明，所有數據均出自標準狀態（25 ℃，100 kPa）下。

五氮化三磷是一種無機化合物，化學式 P₃ N₅。它是磷的一種氮化物。雖然已經對其各種應用進行了研究，但這並沒有導致五氮化三磷有任何重要的工業用途。它是一種白色固體，儘管樣品經常因雜質而呈現其它顏色。

製備

五氮化三磷可以由含有磷(V)的化合物和含有氮陰離子的化合物（例如氨和疊氮化鈉）：^[1]

3 PCl₅ + 5 NH₃ → P₃N₅ + 15 HCl

3 PCl₅ + 15 NaN₃ → P₃N₅ + 15 NaCl + 5 N₂

據稱，磷和氮的反應會產生五氮化三磷。^[2]類似的方法可以用來製備氮化硼 (BN) 和氮化矽 (Si₃N₄)，不過產物通常是不純和無定形的。^[1]^[3]

五氮化三磷晶體可以由氯化銨和六氯環三氮磷烷（英語：hexachlorocyclotriphosphazene）^[4]或五氯化磷反應而成：^[1]

(NPCl₂)₃ + 2 NH₄Cl → P₃N₅ + 8 HCl

3 PCl₅ + 5 NH₄Cl → P₃N₅ + 20 HCl

室溫下，P₃N₅ 也可以由三氯化磷和氨基鈉反應而成。^[5]

3 PCl₃ + 5 NaNH₂ → P₃N₅ + 5 NaCl + 4 HCl + 3 H₂

反應

P₃N₅的熱穩定性比 BN 和Si₃N₄低，在超過 850 °C時分解：^[1]

P₃N₅ → 3 PN + N₂

4 PN → P₄ + 2 N₂

五氮化三磷不與弱酸、弱鹼反應，不溶於水。它加熱水解成(NH₄)₂HPO₄ 和NH₄H₂PO₄。

五氮化三磷和氮化鋰、氮化鈣反應，產生 PN₄⁷⁻ 和PN₃⁴⁻離子。異相氨解會產生像是 HPN₂ 和HP₄N₇的亞氨基化物。有人提出，這些化合物可用作固體電解質（英語：solid electrolytes）和顏料。^[6]

結構和性質

五氮化三磷的多種同質異形體是已知的。α‑P₃N₅是標準情況下，五氮化三磷的形式。加壓到6 GPa時，會轉變成γ‑P₃N₅。計算化學顯示第三種五氮化三磷的結構 δ‑P₃N₅會在約 43 GPa 時出現，為藍晶石結構。^[7]

結構	密度(g/cm³)
α‑P₃N₅	2.77
γ‑P₃N₅	3.65
δ‑P₃N₅	4.02

α‑P₃N₅ 的結構已通過單晶 X射線繞射確定，裏面含有PN₄四面體和二或三配位的氮離子。^[8]

參見

聚磷氮烯（英語：Polyphosphazene）

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 Schnick, Wolfgang. Solid-State Chemistry with Nonmetal Nitrides (PDF). Angewandte Chemie International Edition in English. 1 June 1993, 32 (6): 806–818 [2021-07-25]. doi:10.1002/anie.199308061. （原始內容 (PDF)存檔於2017-08-13）.
^ Vepřek, S.; Iqbal, Z.; Brunner, J.; Schärli, M. Preparation and properties of amorphous phosphorus nitride prepared in a low-pressure plasma. Philosophical Magazine B. 1 March 1981, 43 (3): 527–547. Bibcode:1981PMagB..43..527V. doi:10.1080/01418638108222114.
^ Meng, Zhaoyu; Peng, Yiya; Yang, Zhiping; Qian, Yitai. Synthesis and Characterization of Amorphous Phosphorus Nitride.. Chemistry Letters. 1 January 2000, 29 (11): 1252–1253. doi:10.1246/cl.2000.1252.
^ Schnick, Wolfgang; Lücke, Jan; Krumeich, Frank. Phosphorus Nitride P3N5: Synthesis, Spectroscopic, and Electron Microscopic Investigations. Chemistry of Materials. 1996, 8: 281–286. doi:10.1021/cm950385y.
^ Chen, Luyang; Gu, Yunle; Shi, Liang; Yang, Zeheng; Ma, Jianhua; Qian, Yitai. Room temperature route to phosphorus nitride hollow spheres. Inorganic Chemistry Communications. 2004, 7 (5): 643. doi:10.1016/j.inoche.2004.03.009.
^ Schnick, Wolfgang. Phosphorus(V) Nitrides: Preparation, Properties, and Possible Applications of New Solid State Materials with Structural Analogies to Phosphates and Silicates. Phosphorus, Sulfur, and Silicon and the Related Elements. 1993, 76 (1–4): 183–186. doi:10.1080/10426509308032389.
^ Kroll, P; Schnick, W. A density functional study of phosphorus nitride P3N5: Refined geometries, properties, and relative stability of alpha-P3N5 and gamma-P3N5 and a further possible high-pressure phase delta-P3N5 with kyanite-type structure. Chemistry. 2002, 8 (15): 3530–7. PMID 12203333. doi:10.1002/1521-3765(20020802)8:15<3530::AID-CHEM3530>3.0.CO;2-6.
^ Horstmann, Stefan; Irran, Elisabeth; Schnick, Wolfgang. Synthesis and Crystal Structure of Phosphorus(V) Nitrideα-P3N5. Angewandte Chemie International Edition in English. 1997, 36 (17): 1873–1875. doi:10.1002/anie.199718731.

[Wolfgang-1] 1.0 ^1.1 ^1.2 ^1.3 Schnick, Wolfgang. Solid-State Chemistry with Nonmetal Nitrides (PDF). Angewandte Chemie International Edition in English. 1 June 1993, 32 (6): 806–818 [2021-07-25]. doi:10.1002/anie.199308061. （原始內容 (PDF)存檔於2017-08-13）.

[2] Vepřek, S.; Iqbal, Z.; Brunner, J.; Schärli, M. Preparation and properties of amorphous phosphorus nitride prepared in a low-pressure plasma. Philosophical Magazine B. 1 March 1981, 43 (3): 527–547. Bibcode:1981PMagB..43..527V. doi:10.1080/01418638108222114.

[3] Meng, Zhaoyu; Peng, Yiya; Yang, Zhiping; Qian, Yitai. Synthesis and Characterization of Amorphous Phosphorus Nitride.. Chemistry Letters. 1 January 2000, 29 (11): 1252–1253. doi:10.1246/cl.2000.1252.

[4] Schnick, Wolfgang; Lücke, Jan; Krumeich, Frank. Phosphorus Nitride P3N5: Synthesis, Spectroscopic, and Electron Microscopic Investigations. Chemistry of Materials. 1996, 8: 281–286. doi:10.1021/cm950385y.

[5] Chen, Luyang; Gu, Yunle; Shi, Liang; Yang, Zeheng; Ma, Jianhua; Qian, Yitai. Room temperature route to phosphorus nitride hollow spheres. Inorganic Chemistry Communications. 2004, 7 (5): 643. doi:10.1016/j.inoche.2004.03.009.

[6] Schnick, Wolfgang. Phosphorus(V) Nitrides: Preparation, Properties, and Possible Applications of New Solid State Materials with Structural Analogies to Phosphates and Silicates. Phosphorus, Sulfur, and Silicon and the Related Elements. 1993, 76 (1–4): 183–186. doi:10.1080/10426509308032389.

[7] Kroll, P; Schnick, W. A density functional study of phosphorus nitride P3N5: Refined geometries, properties, and relative stability of alpha-P3N5 and gamma-P3N5 and a further possible high-pressure phase delta-P3N5 with kyanite-type structure. Chemistry. 2002, 8 (15): 3530–7. PMID 12203333. doi:10.1002/1521-3765(20020802)8:15<3530::AID-CHEM3530>3.0.CO;2-6.

[8] Horstmann, Stefan; Irran, Elisabeth; Schnick, Wolfgang. Synthesis and Crystal Structure of Phosphorus(V) Nitrideα-P3N5. Angewandte Chemie International Edition in English. 1997, 36 (17): 1873–1875. doi:10.1002/anie.199718731.

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