カドミウムジブロミド

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．

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.

一般的な説明Odorless white solid. Mixes with water.

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.

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.]