Trithionic acid

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

Trithionic acid

Names
IUPAC names Thiodisulfuric acid[1] 1,5-dihydrido-2,2,4,4-tetraoxido-1,5-dioxy-2,3,4-trisulfy-[5]catena, trithionic acid[2]
Identifiers
CAS Number	27621-39-2[3][4]
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29210[6]
ChEMBL	ChEMBL3754893[8]
ChemSpider	KRURGYOKPVLRHQ-UHFFFAOYSA-N[10]
PubChem CID	492[13][14]
InChI InChI=1S/H2O6S3/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6)[15][16][17] Key: KRURGYOKPVLRHQ-UHFFFAOYSA-N[18][19][20][21]
SMILES OS(=O)(=O)SS(=O)(=O)O
Properties
Chemical formula	H2O6S3[22][23][24][25]
Molar mass	194.19 g·mol−1[26]
Density	2.4±0.1 g/cm3[27]
Melting point	324.41[28] °C (615.94 °F; 597.56 K)
Boiling point	739.35[29] °C (1,362.83 °F; 1,012.50 K)
Solubility in water	1e+006 mg/L[30]
log P	-1.1[31]
Vapor pressure	1.07E-016 Pa (8.05E-019 mm Hg)[32]
Acidity (pKa)	-6.94[33]
Conjugate base	Hydrogen trithionate
Refractive index (nD)	1.700[34]
Pharmacology
Pharmacokinetics:
Biological half-life	0.570 hours[35]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references