Rhenium trioxide
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Rhenium trioxide (rhenium(VI) oxide, ReO3) is a red solid with a metallic lustre. It is the only stable trioxide of the Group 7 elements (Mn, Tc, Re), and can be formed by reducing Re2O7 with CO:
- Re2O7 + CO → 2ReO3 + CO2
[edit] Properties
The molar mass of rhenium trioxide is 234.21 g mol−1. ReO3 is unusual for an oxide because it exhibits very low resistivity. It behaves more like a metal in that its resistivity decreases as its temperature decreases. At 300 K, its resisitivity is 1.0 × 10−7 Ω·m, whereas at 100 K, this decreases to 6.0 × 10−9 Ω·m, 17 times less than at 300 K.
[edit] Structure
Rhenium oxide forms crystals with a primitive cubic unit cell, with a lattice parameter of 3.75 Å (375 pm). The structure of ReO3 is similar to the Perovskite structure (ABO3), without the large A cation at the centre of the unit cell. Each rhenium atom is surrounded by six oxygen atoms, forming an ReO6 octahedron.
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