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|Section2= |Section3= |Section7= |Section8= }} Hexachlorophosphazene is an inorganic compound with the formula (NPCl2)3. The molecule has a cyclic backbone consisting of alternating phosphorus and nitrogen atoms. It can be viewed as a trimer of the hypothetical compound N≡PCl2. Hexachlorophosphazene together with the related (NPCl2)4 are precursors to inorganic polymers called polyphosphazenes. ==Synthesis== The reaction of PCl5 and NH4Cl affords substances with the empirical formula PNCl2.〔Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.〕 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〔〔Liebig-Wöhler, Briefwechsel vol. 1, 63; Ann. Chem. (Liebig), vol. 11 (1834), 146.〕 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hexachlorophosphazene」の詳細全文を読む スポンサード リンク
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