Scandium perrhenate explained

Scandium perrhenate is an inorganic compound, with the chemical formula Sc(ReO₄)₃. Its thermal stability is lower than that of the corresponding compounds of the yttrium and lanthanum perrhenates.^{[1] [2]}

Preparation and properties

Scandium perrhenate can be obtained by reacting perrhenic acid with scandium oxide.^[3] From the solution, the trihydrate of scandium perrhenate can be precipitated, which loses water at 50 °C to obtain Sc(ReO₄)₃·H₂O, and obtains the anhydrous form at 140 °C. Scandium oxide and rhenium(VII) oxide are formed at 550 °C.^[4]

Scandium perrhenate trihydrate is a crystal in the triclinic crystal system, with space group P, a=7.333, b=7.985, c=20.825 Å; α=93.35, β=92.20, γ=97.42°.^[5]

Scandium perrhenate can crystallize with ammonium perrhenate in water to form NH₄Sc(ReO₄)₄·4H₂O.^[6]

Notes and References

1. Ovchinnikov, K. V.; Nikolaev, E. N.; Semenov, G. A. Mass-spectrometric study of the in vacuo thermal decomposition of scandium, yttrium, and lanthanum perrhenates. Zhurnal Obshchei Khimii, 1983. 53 (5): 966-968. ISSN: 0044-460X.
2. 2020-08-01 . ВАЛЕНТИНА МИХАЙЛОВНА БЕРЕСТОВИЦКАЯ (1940-2017) . Журнал Общей Химии . 90 . 8 . 1151–1152 . 10.31857/s0044460x20080016 . 242996070 . 0044-460X.
3. Yi, Xianwu; et al. Series of Inorganic Chemistry - Vol 7. Scandium; Rare Earth Elements. Science Press. pp. 57. 3.9.6 Manganates and Rhenates of Scandium. (in Chinese)
4. Komissarova, L. N.; Varfolomeev, M. B.; Ivanov, V. I.; Plyushchev, V. E. Preparation and properties of scandium perrhenates. Doklady Akademii Nauk SSSR, 1965. 160 (3): 608-611. .
5. Khrustalev, V. N.; Varkholomeev, M. B.; Struchkov, Yu. T. Crystal structure of scandium perrhenate trihydrate. Zhurnal Neorganicheskoi Khimii, 1997. 42 (11): 1779-1784. .
6. Khrustalev, V. N.; Varfolomeev, M. B.; Shamrai, N. B.; Struchkov, Yu. T. Synthesis and crystal structure of double ammonium indium and ammonium scandium perrhenate tetrahydrates. Zhurnal Neorganicheskoi Khimii, 1996. 41 (4): 549-553. .