Rhenium trioxide

Rhenium trioxide can be formed by reducing rhenium(VII) oxide with carbon monoxide at 200 °C or elemental rhenium at 400 °C. :Re2O7 + CO → 2 ReO3 + CO2 :3 Re2O7 + Re → 7 ReO3 Re2O7 can also be reduced with dioxane. ==Properties==

Physical properties ReO3 is unusual for an oxide because it exhibits very low resistivity. It behaves like a metal in that its resistivity decreases as its temperature decreases. At 300 K, its resistivity is 100.0 nΩ·m, whereas at 100 K, this decreases to 6.0 nΩ·m, 17 times less than at 300 K. : 3 ReO3 → Re2O7 + ReO2 Rhenium trioxide can be chlorinated to give rhenium trioxide chloride: : Rhenium trioxide serves as host for the intercalation of one and two equivalents of lithium. Lithium can be incorporated using butyl lithium: : : Re remains octahedral before and after intercalation, but the framework distorts. ==Uses==

Hydrogenation catalyst Rhenium trioxide finds some use in organic synthesis as a catalyst for amide reduction. ==References==