High Quality Content by WIKIPEDIA articles! Rhenium(VII) oxide is the chemical compound with the formula Re2O7. It is the anhydride of the hypothetical acid (HOReO3). Perrhenic acid, Re2O7·2H2O, however is closely related structurally to Re2O7. Solid Re2O7 is polymeric consisting, unusually, of the metal centers in two coordination environments - octahedral and tetrahedral. Gaseous Re2O7 is however molecular, consisting of a pair of ReO4 tetrahedra that share a vertex. Re2O7 is a precursor to methylrhenium trioxide ("MTO"), a catalyst for oxidations. Methylrhenium trioxide, also known as methyltrioxorhenium, is an organometallic compound with the formula CH3ReO3. It is a volatile, colourless solid has been used as a catalyst in some laboratory experiments. In this compound, Re has a tetrahedral coordination environment with one methyl and three oxo ligands. The oxidation state of rhenium is +7.

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