Phosphorus pentachloride (Pentachloride)

Japanese: 五塩化リン(五塩化燐) - ごえんかりん（英語表記）phosphorus pentachloride

Chemical formula: PCl _5. It is obtained by directly reacting phosphorus trichloride (PCl ₃₎ with chlorine. It has a pale yellow tetragonal crystal structure. Its melting point is 167°C (919 mmHg), its sublimation temperature is 160°C, and its specific gravity is 2.119 (20°C). It is soluble in carbon disulfide, carbon tetrachloride, and benzoyl chloride. In the crystalline state, it has an ionic structure with tetrahedral [PCl ₄ ] ⁺ and octahedral [PCl ₆ ] ^- . In the gaseous state, it is a trigonal bipyramidal molecule. In carbon tetrachloride, it exists as a dimer sharing the edges of two octahedra. When it becomes a gas, it dissociates into phosphorus trichloride and chlorine by a few percent at 100°C, and completely at 300°C or higher.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

化学式PCl₅。三塩化リンPCl₃と，塩素を直接反応させると得られる。淡黄色の正方晶。融点167℃(919mmHg)，昇華温度160℃，比重2.119(20℃)。二硫化炭素，四塩化炭素，塩化ベンゾイルに可溶。結晶状態では四面体形の[PCl₄]^＋と八面体形の[PCl₆]^－のイオン性構造。気体では三方両錐形分子。四塩化炭素中では二つの八面体の稜を共有した二量体として存在する。気体にすると，100℃で数％，300℃以上では完全に三塩化リンと塩素に解離する。

出典　株式会社平凡社世界大百科事典第２版について　情報

<<: Coenzyme A - Coenzyme A

>>: Cohen, Stanley