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Rhenium(IV) oxide

Rhenium(IV) oxide or rhenium dioxide is the inorganic compound with the formula ReO<sub>2</sub>. This gray to black crystalline solid is a laboratory reagent that can be used as a catalyst. It adopts the rutile structure.

Synthesis and reactions

It forms via comproportionation:

2 Re<sub>2</sub>O<sub>7</sub> + 3 Re → 7 ReO<sub>2</sub>

Single crystals are obtained by chemical transport, using iodine as the transporting agent.:

ReO<sub>2</sub> + I<sub>2</sub> ReO<sub>2</sub>I<sub>2</sub>

At high temperatures it undergoes disproportionation:

7ReO<sub>2</sub> → 2Re<sub>2</sub>O<sub>7</sub> + 3Re

It forms rhenates with alkaline hydrogen peroxide and oxidizing acids. In molten sodium hydroxide it forms sodium rhenate:

2NaOH + ReO<sub>2</sub> → Na<sub>2</sub>ReO<sub>3</sub> + H<sub>2</sub>O

References