カドミウムジブロミド 化学特性,用途語,生産方法
解説
臭化カドミウムCdBr2(272.22)．炭酸カドミウムに臭化水素を反応させるか，金属カドミウムに臭素ガスを450 ℃ で反応させると得られる．無水物は無色りん片状結晶．六方晶系．密度5.19 g cm－3．融点566 ℃，沸点963 ℃．潮解性で，水，エタノールに易溶．水溶液からは36 ℃ 以下で四水和物が，それ以上では一水和物が得られる．四水和物は無色の斜方晶系結晶．密度3.04 g cm－3．水に易溶．100 ℃ 以上で無水物となる．写真，写真製版，石版印刷に用いられる．
化学的特性
Cadmium bromide is a white to yellowish
crystalline powder.
物理的性質
White to yellowish powder or flakes; hexagonal crystal system; hygroscopic; density 5.192g/cm
3; melts at 568°C; vaporizes at 844°C; soluble in water, alcohol, ether, acetone, and liquid ammonia.
使用
Made by heating cadmium to redness in bromine vapor. The
yellowish crystalline powder is soluble in water and alcohol
and is slightly soluble in ether. The crystals are deliquescent
and must be kept in a well-stoppered bottle. Like its iodide
counterpart, cadmium bromide was used in collodion in
conjunction with an iodide of either ammonium or potassium.
製造方法
Cadmium bromide is prepared by heating cadmium with bromine vapor. Also the compound can be prepared by the treatment of dry cadmium acetate with glacial acetic acid and acetyl bromide. Alternatively, it may be obtained by dissolving cadmium or cadmium oxide in hydrobromic acid and evaporating the solution to dryness under helium in an inert atmosphere.
一般的な説明
Odorless white solid. Mixes with water.
空気と水の反応
Water soluble.
反応プロフィール
CADMIUM BROMIDE has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive.
健康ハザード
Inhalation causes coughing, sneezing, symptoms of lung damage. Ingestion produces severe toxic symptoms; both kidney and liver injuries may occur. Contact with eyes causes irritation.
火災危険
Special Hazards of Combustion Products: Toxic cadmium oxide fumes may form in fires.
安全性プロファイル
Confirmed human
carcinogen. When heated to decomposition
it emits toxic fumes of Cd and Br-.
職業ばく露
Cadmium bromide is used in photography, engraving, and lithography
輸送方法
UN 2570 Cadmium compounds, Hazard Class:
6.1; Labels: 6.1-Poisonous materials, Technical Name
Required
純化方法
Crystallise it from water (0.6mL/g) between 100o and 0o, and dry it at 110o. It forms the monohydrate below 36o and the tetrahydrate above 36o. [Wagenknecht & Juza in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1096 1965.]
カドミウムジブロミド 上流と下流の製品情報
原材料
準備製品