Sodium perrhenate explained

Sodium perrhenate (also known as sodium rhenate(VII)) is the inorganic compound with the formula NaReO₄. It is a white salt that is soluble in water. It is a common precursor to other rhenium compounds. Its structure resembles that of sodium perchlorate and sodium permanganate.

Preparation

It can be prepared by treatment of rhenium heptoxide with base or by ion exchange from the potassium salt.^[1]

Sodium perrhenate can be prepared from rhenium metal with hydrogen peroxide in the presence of base.^[2]

2 Re + 7 H2O2 + 2 NaOH -> 2 NaReO4 + 8 H2O

Reactions

It reacts with sodium in ethanol to give nonahydridorhenate.^[1]

Sodium perrhenate has been used as a precursor of rhenium nitrides (such as Re₃N, Re₂N, Re₃N₂, ReN₂, ReN₃, ReN₄), which can be used as catalysts for ammonia synthesis and for hydro-denitrogenation.^[3]

It can be used to prepare Re₂(CO)₁₀.^[2]

References

1. Book: Nonahydridorhenate Salts. A. P. Ginsberg . C. R. Sprinkle . Inorganic Syntheses. 1972. 13. 219–225. 10.1002/9780470132449.ch45. 978-0-470-13244-9.
2. Crocker. Lisa S.. Gould. George L.. Heinekey. D. Michael. 1988. Improved Synthesis of Carbonylrhenium. Journal of Organometallic Chemistry. 342. 2. 243–244. 10.1016/s0022-328x(00)99461-0.
3. Hämäläinen. Jani. Mizohata. Kenichiro. Meinander. Kristoffer. Mattinen. Miika. Vehkamäki. Marko. Räisänen. Jyrki. Ritala. Mikko. Leskelä. Markku. 2018-08-27. Rhenium Metal and Rhenium Nitride Thin Films Grown by Atomic Layer Deposition. Angewandte Chemie International Edition. 57. 44. 14538–14542. en. 10.1002/anie.201806985. 30048031. 1433-7851. 10138/325623. 51721705. free.

Further reading

• Ahluwalia. J. C.. Cobble, J. W. . The Thermodynamic Properties of High Temperature Aqueous Solutions. II. Standard Partial Molal Heat Capacities of Sodium Perrhenate and Perrhenic Acid from 0 to 100o. Journal of the American Chemical Society. 1 December 1964. 86. 24. 5377–5381. 10.1021/ja01078a001.
• Dwek. Raymond A.. Luz, Z. . Shporer, M. . Nuclear magnetic resonance of aqueous solutions of sodium perrhenate. The Journal of Physical Chemistry. 1 May 1970. 74. 10. 2232–2233. 10.1021/j100909a038.