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Chemical compound
Rhenium(IV) oxide or rhenium dioxide is the inorganic compound with the formula ReO2. 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 Re2O7 + 3 Re → 7 ReO2
Single crystals are obtained by chemical transport, using iodine as the transporting agent.:
 ReO2 + I2 ⇌ ReO2I2
At high temperatures it undergoes disproportionation:
7ReO2 → 2Re2O7 + 3Re
It forms rhenates with alkaline hydrogen peroxide and oxidizing acids. In molten sodium hydroxide it forms sodium rhenate:
 2NaOH + ReO2 → Na2ReO3 + H2O
References.
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