ストロンチウムジブロミド

解説

臭化ストロンチウム．炭酸ストロンチウムを臭化水素酸に溶かし，濃縮すると六水和物が得られる．六水和物は無色の六方晶系針状結晶．吸湿性があり，水に易溶．密度2.39 g cm－3．88.2 ℃ で融解して二水和物となり，さらに高温で一水和物となる．無水物は炭酸ストロンチウムと臭化アンモニウムとを強熱して得られる．無色の六方晶系針状結晶．密度4.22 g cm－3．融点657 ℃．融点以上に熱すると分解する．吸湿性があり，水に易溶．医薬品(鎮静剤，抗てんかん剤)，分析試薬などに用いられる．

説明

Strontium bromide has the formula SrBr2. At room temperature, it is a white, odorless, crystalline powder with the molecular weight of 247.43 g/mol. Strontium bromide burns bright red in a flame test. It is used in flares and also has some pharmaceutical uses. Several hydrates have been characterized including the monohydrate and the hexahydrate, SrBr2·6H2O. This salt is a white, hygroscopic powder soluble in water and alcohol. It loses water at 180°C, melts at 643°C and is used in medicine and as an analytical reagent.
The anhydrate, SrBr2, is a colorless, transparent, crystal, odorless, having a bitter, saline taste. It is very deliquescent and soluble in water and is readily soluble in alcohol and amyl alcohol. The specific gravity of SrBr2 is 4.210 g/cm3. It can be prepared by treating SrCO3 with a hydrogen bromide solution. Alternatively, a strontium salt (carbonate, sulfate, chloride, etc.) is treated with bromine or hydrobromic acid in presence of a reducing agent.

化学的特性

White crystalline powder

使用

Strontium bromide are colorless crystals made by neutralizing hydrobromic acid with strontium hydrate. The crystals are soluble in water but less so in alcohol. Strontium bromide was occasionally used to increase contrast in collodion emulsions.

危険性

Toxic by ingestion and inhalation.

純化方法

Crystallise the bromide from water (0.5mL/g). It is deliquescent. [Ehrlich in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 930 1963.]