Europium(III) nitrate hexahydrate under fluorescent lamp (left) and UV light (right).

Europium(III) nitrate is an inorganic compound with the formula Eu(NO3)3·x(H2O). The hexahydrate is a common salt. It forms colorless hygroscopic crystals.

Preparation

The salt is usually obtained by dissolving europium(III) oxide (Eu2O3) in nitric acid produces europium(III) nitrate.[2]

Eu2O3 + 6 HNO3 → 2 Eu(NO3)3 + 3 H2O

Structure

Like all trinitates of the lanthanides, dilute (<0.01 M) solutions of consists of the aquo complex [Eu(H2O)x]3+ where x = 8 or 9. At higher concentrations, the binding of nitrate to Eu is observed.[3]

Complexes

Europium(III) nitrate reacts with anions and other Lewis bases to form complexes. For example, with 1,3,5-trimesic acid, europium metal-organic framework, a coordination polymer, under hydrothermal conditions.[4]

References

  1. ^ Melnikov, P.; Arkhangelsky, I. V.; Nascimento, V. A.; De Oliveira, L. C. S.; Silva, A. F.; Zanoni, L. Z. (2017). "Thermal properties of europium nitrate hexahydrate Eu(NO3)3·6H2O" (PDF). Journal of Thermal Analysis and Calorimetry. 128 (3): 1353–1358. doi:10.1007/s10973-016-6047-9. S2CID 99674207.
  2. ^ Odent, Guy; Charetteur, Elisabeth; Duperray, Marie H. Crystallization, radiocrystallographic characterization, and infrared absorption spectra of hexahydrates and pentahydrates of nitrates and lanthanides. Revue de Chimie Minerale, 1975. 12 (1): 17-23.
  3. ^ Yatsenko, Alexandr V.; Gloriozov, Igor P.; Zhokhova, Nelly I.; Paseshnichenko, Ksenia A.; Aslanov, Leonid A.; Ustynyuk, Yuri A. (2021). "Structure of lanthanide nitrates in solution and in the solid state: DFT modelling of hydration effects". Journal of Molecular Liquids. 323. doi:10.1016/j.molliq.2020.115005.
  4. ^ Habimana, Fabien; Huo, Yanxia; Jiang, Sai; Ji, Shengfu. Synthesis of europium metal-organic framework (Eu-MOF) and its performance in adsorptive desulfurization. Adsorption, 2016. 22 (8): 1147-1155. DOI:10.1007/s10450-016-9838-1.