Rhenium(VII) oxide

Rhenium(VII) oxide is the chemical compound with the formula Re2O7. It is the anhydride of the hypothetical perrhenic acid (HOReO3). However is closely related structurally to Re2O7. Re2O7 is a polymeric consisting, unusually, of the metal centers in two coordination environments - octahedral and tetrahedral. Gaseous Re2O7 is however molecular, consisting of a pair of tetrahedra that share a corner.

Re2O7 is a precursor to methyl rhenium trioxide ("MTO"), a catalyst for oxidations.