Perrhenate

Perrhenates are chemical compounds of the perrhenate anion ReO ₄ ^- . The perrhenates are the salts of the perrhenic acid HReO ₄ .

Extraction and presentation

The reaction of a base and the perrhenic acid produces the perrhenate anion.

${\displaystyle {\ce {OH- + HReO4 -> ReO4- + H2O}}}$

Examples:

${\displaystyle {\ce {NaOH + HReO4 -> NaReO4 + H2O}}}$

Sodium hydroxide and perrhenic acid react to form sodium perrhenate and water .

${\displaystyle {\ce {NH3 + HReO4 -> NH4ReO4 + H2O}}}$

Ammonia and perrhenic acid react to form ammonium perrhenate and water .

properties

Like the perchlorate anion, the perrhenate ion has a tetrahedral structure. The perrhenate salts have a different color depending on the cation . The pertechnetate anion TcO ₄ ^- has similarities with the perrhenate ion in terms of its chemistry. The anion is stable over a wide pH range. At a very high pH value, ReO ₅ ³⁻ is also formed . It was also observed that ReO ₄ ^- more strongly coordinated than the perbromate ion BrO ₄ ^- or the perchlorate ion ClO ₄ ^- , but in contrast to the bromide Br ^- or chloride Cl ^- the coordination is weaker.

Individual evidence

1. ↑ Steven A. Luksic, Brian J. Riley, Kent E. Parker, Pavel Hrma: Sodalite as a vehicle to increase Re retention in waste glass simulant during vitrification . In: Journal of Nuclear Materials . October 2016, p. 331-337 , doi : 10.1016 / j.jnucmat.2016.07.002 .
2. ↑ RDW Kemmitt, RD Peacock: The Chemistry of Manganese, technetium and rhenium: Pergamon text in Inorganic Chemistry . Elsevier, 2016, ISBN 1-4831-3806-2 , pp. 947 .