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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

VCl4 is the least stable vanadium chloride. Its decomposition is driven by heat, dissolved Cl2 concentration, humidity or light, following the equation:

VCl4 + H2O => VOCl2 + 4 HCl

The dissolution reaction in water is exothermic, instantaneous (half-life of VCl4 < 1 hour – VCl4 can be considered as a hydrolytically unstable substance), gives white fumes of HCl and the pH of the solution is < 2.

Then the decomposition with the humidity of air follows the equations:


2VOCl2+ 2H2O => 2VO2+ 4HCl


That is why no data is available for VCl4 as such and in solution V2O4 is stable in the form of V4 +.

This reaction is verified weekly in laboratory by the color change when VCl4 is exposed to the air (brown to blue).Testing for hydrolysis is then technically impossible and scientifically unjustified: instantaneous decomposition of VCl4 (half-life of VCl4 < 1 hour) in presence of humidity of air do not allow hydrolysis testing

Additional information