1. Molecular Formula: Cl₂HNO₄S₂ (HN(SO₂Cl)₂)

Molecular Weight: 211.05 g/mol

2. Appearance: Colorless crystals

3. Melting Point: 37 °C

4. Density: 2.094 ± 0.06 g/cm³

5. Boiling Point: 115 °C (at 4 Torr)

6. Acidity (pKa): −8.46 ± 0.40, classified as a superacid

1. Synthesis of New Energy Materials:

A key precursor for lithium bis(fluorosulfonyl)imide (LiFSI) in lithium batteries. It is converted to bis(fluorosulfonyl)imide acid via fluorination, which further reacts with lithium salts to form LiFSI.

2. Organic Synthesis Reagent:

- Catalyst for amidation reactions, replacing traditional reagents such as dicyclohexylcarbodiimide (DCC).

- Used in the preparation of sulfonamides and sulfonylureas for pharmaceutical and pesticide synthesis.

- Acts as a strong acid catalyst to promote sulfonation and chlorination reactions of insoluble compounds.

3. Ionic Liquid Preparation:

Reacts with nitrogen-containing heterocyclic compounds to synthesize new ionic liquids for applications in electrochemistry and catalysis.