Intermediate oxides of tungsten

A number of unusual intermediate oxides are formed from reacting tungsten metal and tungsten trioxide (WO₃), including W₂₀O₅₈ and W₂₄O₇₀. W₁₈O₄₉ contains both octahedral and pentagonal bipyramidal co-ordination of the metal atoms by oxygen.

Tungsten pentoxide (W₂O₅) was reported in early literature but proved to have the stoichiometry W₁₈O₄₉. Sometimes called mineral blue, it is a blue solid formed by the reaction of tungsten trioxide and tungsten metal at 700 °C.

See also

• Tungsten(III) oxide
• Tungsten(IV) oxide
• Tungsten(VI) oxide

References

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