Trithionic acid

Trithionic acid is a polythionic acid with three sulfur atoms. It can be viewed as two bisulfite radicals bridged by a sulfur atom.

Trithionic acid

Names
IUPAC names Thiodisulfuric acid 1,5-Dihydrido-2,2,4,4-tetraoxido-1,5-dioxy-2,3,4-trisulfy-[5]catena[1] Trithionic acid
Identifiers
CAS Number	27621-39-2
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29210
ChEMBL	ChEMBL3754893
ChemSpider	KRURGYOKPVLRHQ-UHFFFAOYSA-N
PubChem CID	492
CompTox Dashboard (EPA)	DTXSID90182006
InChI InChI=1S/H2O6S3/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6) Key: KRURGYOKPVLRHQ-UHFFFAOYSA-N
SMILES OS(=O)(=O)SS(=O)(=O)O
Properties
Chemical formula	H2O6S3[1][2][3]
Molar mass	194.19 g·mol−1[3]
Density	2.4±0.1 g/cm3
Melting point	324.41 °C (615.94 °F; 597.56 K)
Boiling point	739.35 °C (1,362.83 °F; 1,012.50 K)
Solubility in water	1.0·106 mg/L
log P	−1.1[2]
Vapor pressure	1.07·10−16 Pa (8.05·10−19 mm Hg)
Acidity (pKa)	−6.94[2]
Conjugate base	Hydrogen trithionate
Refractive index (nD)	1.700
Pharmacology
Pharmacokinetics:
Biological half-life	0.570 hours
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references