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.^[1] The material is used as a reagent in the preparation of rhenium compounds.

Rhenium trioxide chloride

Names
Other names Rhenium oxychloride
Identifiers
CAS Number	42246-25-3
3D model (JSmol)	Interactive image
InChI Key: YDGWOHYNESLUAQ-UHFFFAOYSA-M
SMILES O=[Re](=O)(=O)Cl
Properties
Chemical formula	ClO3Re
Molar mass	269.65 g·mol−1
Appearance	colorless liquid
Density	4.665 g/cm3 (-100 °C)
Melting point	4.5 °C (40.1 °F; 277.6 K)
Boiling point	113 °C (235 °F; 386 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis and reactions

Rhenium trioxide chloride can be prepared by chlorination of rhenium trioxide:^[2]

2 ReO₃ + Cl₂ → 2 ReO₃Cl

With Lewis bases (L), rhenium trioxide chloride reacts to form adducts with the formula ReO₃ClL₂.^[3][4]

The compound hydrolyzes readily to give perrhenic acid.

Structure

The compound adopts a tetrahedral structure with Re-O and Re-Cl bond distances of 1.71 and 2.22 Å.^[5] In contrast rhenium trioxide fluoride (ReO₃F) is polymeric with octahedral Re centers.