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溴化銫

溴化銫
IUPAC名
Caesium bromide
别名 溴化銫
识别
CAS号 7787-69-1  checkY
PubChem 24592
ChemSpider 22994
SMILES
 
  • [Cs+].[Br-]
InChI
 
  • 1/BrH.Cs/h1H;/q;+1/p-1
InChIKey LYQFWZFBNBDLEO-REWHXWOFAA
EINECS 232-130-0
性质
化学式 CsBr
摩尔质量 212.81 g/mol g·mol⁻¹
外观 白色固體
密度 4.44 g/cm3, 固態
熔点 636 °C
沸点 1300 °C
溶解性 1062 g/L (15 °C)
1243 g/L (25 °C)
结构
晶体结构 CsCl
配位几何 8–8
危险性
欧盟编号 沒列明
闪点 不可燃
相关物质
其他阴离子 氟化銫,
氯化銫,
碘化銫
其他阳离子 溴化鋰,
溴化鈉
溴化鉀
溴化銣
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

溴化銫是一種無機離子化合物,屬於溴化物,為一種鹽類,其化學式為CsBr,是一種白色固體或白色粒、塊狀物。 它具有簡單立方p型立方晶體結構,相當於氯化銫型,空間群為Pm3m ,晶格常數 為 a = 0.42953 nm. Cs和Br 的距離為0.37198 nm.

制備

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它可以透過下列反應製備:

強鹼氫氧化銫較強的酸氫溴酸混合酸鹼中和制得:

CsOH (aq) + HBr (aq) → CsBr (aq) + H2O (l)
Cs2(CO3) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H2O (l) + CO2 (g)

直接合成

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直接將氣態溴和金屬銫放在一起,會在氣態自燃

2 Cs (s) + Br2 (g) → 2 CsBr (s)

直接合成是最快的方式,但由於成本高、實驗操作不易,所以一般不使用此方法。

用途

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溴化銫可作為分光鏡光學元件在長波段分光光度儀

參見

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參考文獻

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溴化銫
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