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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Vapour pressure

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Description of key information

Not applicable, ionic liquids are not volatile.

Key value for chemical safety assessment

Additional information

Ionic liquids are salts which melt below 100°C, preferential below room temperature.

This for salts unusual behaviour belongs to the fact that the constructive ions have a delocalised charge distribution and are asymmetrical.

That’s why they grab inefficiently into undefined structures in the ion-lattice.

This ineffective and less precise package leads to less energy of crystallisation, higher entropy and therefore low melting points.

The inefficient packing of the ions can not prevent that the interaction among them is strong enough to prevent boiling at atmosphere pressure. Hence ionic liquids are not volatile.