コバルト(III)トリフルオリド 化學特性,用途語,生産方法
解説
フッ化コバルト(Ⅲ)：CoF3(115.93)．三フッ化コバルトともいう．フッ化コバルト(Ⅱ)にフッ素を作用させると得られる．淡褐色の粉末．密度3.88 g cm－3．封管中で安定である．濕った空気とただちに反応して黒褐色の粉末になる．熱すると分解する．水と反応して水酸化コバルト(Ⅲ)を生じる．炭化水素のフッ素化剤として用いられる．毒性が強く組織をはげしく刺激する．
化學的特性
The heat of formation is —187 kcal mole-1 and the magnetic moment is 1-60
B.M. at 90°K rising to 2.46 B.M. at 293°K; it is thus a high spin compound but not magnetically dilute.
Anhydrous cobalt(III) fluoride turns dark in the presence of traces of water and reacts violently with the liquid-evolving oxygen. When heated in an inert atmosphere above 350°, cobalt(II) fluoride is formed. It reacts vigorously with many elements, e.g. Al, P, As, S, I, being reduced to cobalt(II) fluoride. It is insoluble in alcohol, ether and benzene and is a useful fluorinating agent in organic chemistry.
物理的性質
Light brown hexagonal crystal; density 3.88 g/cm
3; moisture sensitive; stable in dry air; melts at 927°C; reacts with water.
使用
Cobalt(III) fluoride is a powerful fluorinating agent.
製造方法
Cobalt(III) fluoride may be prepared by reaction of elemental fluorine with cobalt(II) fluoride, cobalt(II) chloride or cobalt(III) oxide at 300 to 400°C.
2CoF
2 + F
2 → 2CoF
3
2CoCl
2 + 3F
2 → 2CoF
3 + 2Cl
2
It should be stored in a sealed glass ampule, free from moisture.
Electrolytic oxidation of cobalt(II) fluoride in 40% hydrofluoric acid yields hydrated cobalt(III) fluoride, CoF
3·3.5H
2O (3.5 is the stoichiometric amount of water per CoF3 molecule in the crystal lattice).
危険性
Strong irritant to tissue.
參考文獻
M.A. Hepworth, et al., Acta Crystallogr., 10, 63 (1957), DOI: 10.1107/S0365110X57000158.
コバルト(III)トリフルオリド 上流と下流の製品情報
原材料
準備製品