硒酸铁

硒酸铁


英文名 iron(III) selenate
识别
CAS号 13718-77-9（无水）  checkY
166547-62-2（九水）  checkY
性质
化学式 Fe2O12Se3
摩尔质量 540.56 g·mol−1
外观 暗黄色固体（无水）[1]
若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。

硒酸铁是一种无机化合物，化学式为Fe2(SeO4)3，存在无水物和九水合物。硒酸铁的热稳定性比对应的硫酸铁差。[1]

制备及性质

无水硒酸铁可由草酸亚铁和硒酸按化学计量比在450 K进行水热反应得到，无水物的空间群为P21/n。[2]九水合硒酸铁可以在一般条件（22 °C，1 bar）下从硒酸酸化的水溶液中结晶出来，晶体属P31c空间群。[3]

九水合物在45~200 °C时失水分解，分解过程中生成四水、二水和一水合物，伴随着部分六价硒还原为四价硒，230 °C时生成无水物，390 °C时无水物分解，490~640 °C经过亚硒酸-硒酸盐，最终生成氧化铁。[1]

硒酸铁可以形成复盐，如CsFe(SeO4)2·12H2O。[4]

参考文献

  1. ^ 1.0 1.1 1.2 Samplavskaya, K. K.; Selivanova, N. M.; Mazepova, V. I. Thermal stability of iron selenate（俄文）. Izvestiya Vysshikh Uchebnykh Zavedenii, Khimiya i Khimicheskaya Tekhnologiya, 1964. 7 (4): 540-543. ISSN: 0579-2991.
  2. ^ Gerald Giester, Manfred Wildner. Synthesis and crystal structure of monoclinic Fe2(SeO4)3. Monatshefte für Chemie Chemical Monthly. 1991, 122 (8-9): 617–623 [2020-05-29]. ISSN 0026-9247. doi:10.1007/BF00811460 （英语）. 
  3. ^ Giester, G.; Miletich, R. Crystal structure and thermal decomposition of the coquimbite-type compound Fe2(SeO4)​3·9H2O. Neues Jahrbuch fuer Mineralogie, Monatshefte, 1995. 5: 211-223. ISSN: 0028-3649.
  4. ^ Stephen P. Best, J. Bruce Forsyth. Stereochemistry of tervalent aqua ions: low-temperature neutron diffraction structures of CsFe(SO 4 ) 2 ·12H 2 O and CsFe(SeO 4 ) 2 ·12H 2 O. J. Chem. Soc., Dalton Trans. 1990, (2): 395–400 [2020-05-29]. ISSN 0300-9246. doi:10.1039/DT9900000395 （英语）. 

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