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三氟化镨

三氟化镨
别名 氟化镨
氟化镨(III)
识别
CAS号 13709-46-1  checkY
SMILES
 
  • [Pr+3].[F-].[F-].[F-]
性质
化学式 PrF3
摩尔质量 197.9028 g·mol⁻¹
密度 6.267 g·cm−3[1]
熔点 1370 °C[2]
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

三氟化镨是一种无机化合物,化学式为PrF3,是镨最稳定的氟化物。

制备

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三氟化镨通常利用复分解法来制备,如硝酸镨氟化钠反应,生成的浅绿色沉淀即为三氟化镨:[3]

Pr(NO3)3 + 3 NaF → 3 NaNO3 + PrF3

无水氯化镨三氟化铝共熔,三氯化铝升华后,可以得到三氟化镨。[4]

也有文献报道三氟化氯和镨的各种氧化物(Pr2O3、Pr6O11以及PrO2)反应,三氟化镨是唯一产物。三氟化溴和在空气中放置一段时间的氧化镨反应也有三氟化镨生成,但反应不完全;草酸镨的水合物和三氟化溴反应,可以得到三氟化镨,并且有碳生成。[5]氧化镨和六氟化硫在584 °C反应,也能得到三氟化镨。[6]

参考文献

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  1. ^ E. A. Krivandina, Z. I. Zhmurova, B. P. Sobolev, T. M. Glushkova, D. F. Kiselev, M. M. Firsova, A. P. Shtyrkova. Growth of R 1 − y Sr y F3 − y crystals with rare earth elements of the cerium subgroup (R = La, Ce, Pr, or Nd; 0 ≤ y ≤ 0.16) and the dependence of their density and optical characteristics on composition. Crystallography Reports. 2006-10, 51 (5): 895–901 [2019-03-26]. ISSN 1063-7745. doi:10.1134/S106377450605021X (英语). 
  2. ^ H. von Wartenberg. The melting points of neodymium and praseodymium fluorides. Naturwissenschaften, 1941. 29: 771. ISSN: 0028-1042.
  3. ^ Lin Ma, Wei-Xiang Chen, Yi-Fan Zheng, Jie Zhao, Zhude Xu. Microwave-assisted hydrothermal synthesis and characterizations of PrF3 hollow nanoparticles. Materials Letters. 2007-5, 61 (13): 2765–2768 [2019-03-26]. doi:10.1016/j.matlet.2006.04.124. (原始内容存档于2018-07-02) (英语). 
  4. ^ Polyachenok, O. G. Enthalpy of formation of lanthanum and praseodymium fluorides. Zhurnal Neorganicheskoi Khimii, 1965. 10 (8): 1939-1940. ISSN: 0044-457X.
  5. ^ Alexander I. Popov, George Glockler. Observations on the Fluorination of Praseodymium and Neodymium Compounds. Journal of the American Chemical Society. 1952-3, 74 (5): 1357–1358 [2019-03-26]. ISSN 0002-7863. doi:10.1021/ja01125a521. (原始内容存档于2020-11-07) (英语). 
  6. ^ Opalovskii, A. A.; Lobkov, E. U.; Erenburg, B. G.; Zakhar'ev, Yu. V.; Shingarev, V. G. Reaction of sulfur hexafluoride with rare earth oxides(俄文). Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, 1972. 10 (8): 1877. ISSN: 0002-337X.
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三氟化镨
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