Rhenium trioxide chloride

Rhenium trioxide chloride is an inorganic compound with the formula

ReO₃Cl. It is a colorless, distillable, diamagnetic liquid. It is a rhenium oxychloride. The material is used as a reagent in the preparation of rhenium compounds.

Rhenium trioxide chloride can be prepared by chlorination of rhenium trioxide:

2 ReO₃ + Cl₂ → 2 ReO₃Cl

With Lewis bases (L), rhenium trioxide chloride reacts to form adducts with the formulaReO₃ClL₂.

The compound hydrolyzes readily to give perrhenic acid.

The compound adopts a tetrahedral structure with Re-O and Re-Cl bond distances of 1.71 and 2.22 Å. In contrast rhenium trioxide fluoride (ReO₃F) is polymeric with octahedral Re centers.