硝酸镭

硝酸镭是一种无机化合物,化学式为Ra(NO3)2,有强放射性。它是白色固体,但旧样本呈黄灰色。它的溶解度比硝酸钡低。[1][4]

硝酸镭
英文名
识别
CAS号 10213-12-4  checkY
PubChem 56844152
SMILES
 
  • [Ra+2].[O-][N+](=O)[O-].[O-][N+](=O)[O-]
性质
化学式 Ra(NO3)2
350.0343 g·mol¹
外观 白色固体[1]
密度 4.176 g/cm3(100 K[2]
溶解性 12.1g(20℃)[3]
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

制备

硝酸镭通常用硝酸和金属氢氧化镭碳酸镭的反应制备:[3]

Ra(OH)2 + 2 HNO3 → Ra(NO3)2 + 2 H2O

其单晶可以通过异丙醇挥发至硝酸镭水溶液中得到,但久置会因自身辐射而变黄。[2]

化学性质

硝酸镭在820℃分解,生成氧化镭。是否经过亚硝酸镭(Ra(NO2)2)为中间产物仍属未知。[3]

参考文献

  1. Otto Erbacher. [Solubility determinations of some radium salts]. Chemische Berichte. 1930, 63 (1): 141–156. doi:10.1002/cber.19300630120 (德语).
  2. Zhuanling Bai, Jacob Brannon, Cristian Celis-Barros, Nicholas Beck, Joseph M. Sperling, Brian M. Rotermund, Daniela Gomez Martinez, Hannah B. Wineinger, and Thomas E. Albrecht-Schönzart. Radium Revisited: Revitalization of the Coordination Chemistry of Nature’s Largest +2 Cation. Inorg. Chem. 2023, 62, 22, 8478–8481. doi:10.1021/acs.inorgchem.3c01170.
  3. Richard C. Ropp. Encyclopedia of the Alkaline Earth Compounds. Elsevier, 2013. pp 223. Radium Nitrate
  4. Kirby 1964,第4–8頁
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