Rhenium(IV) oxide

Updated on Oct 03, 2024

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Formula ReO2 Density 11.4 g/cm³		Molar mass 218.206 g/mol Pubchem 82847

Appearance gray orthorhombic crystals

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

At high temperatures it undergoes disproportionation:

7 ReO₂ → 2 Re₂O₇ + 3 Re

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

2 NaOH + ReO₂ → Na₂ReO₃ + H₂O

References

Rhenium(IV) oxide Wikipedia

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