フェニルアルソン酸 化学特性,用途語,生産方法
外観
白色～うすい黄色、結晶～結晶性粉末
溶解性
水、エタノールに可溶:エーテルに不溶。
解説
benzenearsonic acid．C6H7AsO3(202.04)．フェニルアルソン酸, 塩化ベンゼンジアゾニウムと三塩化ヒ素とから得られるテトラクロロ(フェニル)アルソランを加水分解すると合成される．無色の柱状晶．分解点158 ℃．pKa1 3.47，pKa2 8.48(水)．水，エタノールに可溶，エーテルに不溶．亜鉛アマルガムと酸により還元されてフェニルアルシンになる．チタン，ジルコニウムなどの金属イオンと錯体を形成するので，分析用試薬として用いられる．森北出版「化学辞典（第2版）
用途
Zr, Sn, Th, Nb, Ta, Biの分析試薬、有機合成原料。
化学的特性
white to slightly yellow crystalline powder
使用
Arsonic acids (arsonic acid, phenylarsonic acid, p-hydroxyphenylarsonic acid,
arsanilic acid) react with the tetravalent metals of group IV of the periodic
system to give water-insoluble complexes of composition MA2 . The composition
of the precipitates is not exactly stoichiometric, and hence the precipitates are not
suitable for direct gravimetric analysis. Instead, the precipitates are transformed
by ignition to the corresponding metal oxides and weighed as such. The main
advantage of the application of these reagents is the possibility offered of the
selective determination of zirconium(IV), hafnium(IV) and titanium(IV) in the
presence of many other metals, such as zinc, manganese, nickel, cobalt, aluminium,
copper, calcium, magnesium and chromium. In practice they are utilized most
frequently for the determination of zirconium.
In strong mineral acidic media phenylarsonic acid forms water-insoluble precipitates
with zirconium and hafnium only. In highly concentrated acetic acid
solution the thorium phenylarsonate complex is also precipitated, which makes
possible the separation of thorium from rare earth metals.
The procedure gives satisfactory results in the presence of alkaline earth metals,
iron, aluminium, manganese, cobalt, nickel, copper, zinc and bismuth.
一般的な説明
Colorless solid. Used as an analytical reagent for tin.
反応プロフィール
PHENYLARSONIC ACID emits poisonous fumes of arsenic when heated to decomposition. [EPA, 1998].
健康ハザード
PHENYLARSONIC ACID is a deadly poison. (Non-Specific -- Arsenic Compounds) Chronic exposure to arsenic compounds can cause dermatitis and digestive disorders. Renal damage may develop.
火災危険
PHENYLARSONIC ACID emits poisonous fumes of arsenic when heated to decomposition.
安全性プロファイル
A deadly poison by ingestion andintravenous routes. When heated to decomposition it emits toxic fumes of As.
職業ばく露
This material is used as an analytical
reagent for tin.
輸送方法
UN3280 Organoarsenic compound, liquid, n.o.s.,
Hazard Class: 6.1; Labels: 6.1—Poisonous materials,
Technical Name Required. Potential Inhalation Hazard
(Special Provision 5).
純化方法
Crystallise it from H2O (3mL/g) between 90o and 0o. Alternatively dissolve 600g of the acid in 500mL of boiling H2O, add 20g of Norite, filter hot, cool, filter off the crystals and dry them. On heating at ~154-160o it is converted to the anhydride. [Bullard & Dickery Org Synth Coll Vol II 494 1943, for the 4-nitro derivative see Ruddy & Starkey Org Synth Coll Vol III 665 1955, Beilstein 16 H 868, 16 I 448, 16 II 457, 16 III 1057, 16 IV 1183.]
フェニルアルソン酸 上流と下流の製品情報
原材料
準備製品