6:2-Fluorotelomersulfonic acid

6:2-Fluorotelomersulfonic acid
Names
	Other names 6:2 Fluorotelomer Sulfonate
Identifiers
CAS Number	27619-97-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	106865;
ECHA InfoCard	100.044.149
EC Number	248-580-6;
PubChem CID	119688;
UNII	9E5JL7S7WY;
CompTox Dashboard (EPA)	DTXSID6067331 ;
	InChI InChI=1S/C8H5F13O3S/c9-3(10,1-2-25(22,23)24)4(11,12)5(13,14)6(15,16)7(17,18)8(19,20)21/h1-2H2,(H,22,23,24) Key: VIONGDJUYAYOPU-UHFFFAOYSA-N;
	SMILES OS(=O)(=O)CCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F;
Properties
Chemical formula	C8H5F13O3S
Molar mass	428.16 g·mol−1
Appearance	White to light brown solid
Density	1.953 g/cm³ (at 20 °C)
Melting point	87 °C (189 °F; 360 K)
Solubility in water	658 g/l in water (20 °C)
Acidity (pKa)	1.31
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H373
Precautionary statements	P260, P264, P264+P265, P270, P280, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P330, P363, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

6:2-fluorotelomersulfonic acid (6:2-FTS) is a chemical compound that belongs to the group of fluorotelomersulfonic acids within the broader class of per- and polyfluorinated alkyl compounds (PFAS). Due to its structural similarity to perfluorooctanesulfonic acid (PFOS), it is also called H₄PFOS.^[2]

Production

6:2-Fluorotelomersulfonic acid is produced via telomerization. In addition, it is also formed, for example, from some perfluorocarboxybetaines after their splitting.^[3]

Usage

6:2-Fluorotelomersulfonic acid and its derivatives are used as a replacement product for perfluorooctanesulfonic acid (PFOS) or its salts in fire-fighting foams. 6:2-FTS has also been used in the chromium plating industry to reduce mist formation during plating.^[4]^[5]^[6]

References

^ "1-Octanesulfonic acid, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-". pubchem.ncbi.nlm.nih.gov.
^ "Comparison of the chemical structural formula of 6:2 FTCA/6:2 FTSA and... | Download Scientific Diagram".
^ "zwitterionic carboxybetaine polymer: Topics by Science.gov". www.science.gov.
^ The use of PFAS and fluorine-free alternatives in fire-fighting foams, 2020
^ Yang, Shih-Hung; Shan, Libo; Chu, Kung-Hui (2022). "Fate and Transformation of 6:2 Fluorotelomer Sulfonic Acid Affected by Plant, Nutrient, Bioaugmentation, and Soil Microbiome Interactions". Environmental Science & Technology. 56 (15): 10721–10731. doi:10.1021/acs.est.2c01867. PMC 10134682. PMID 35830472.
^ Yang, Xiaoling; Huang, Jun; Zhang, Kunlun; Yu, Gang; Deng, Shubo; Wang, Bin (2014). "Stability of 6:2 fluorotelomer sulfonate in advanced oxidation processes: degradation kinetics and pathway". Environmental Science and Pollution Research. 21 (6): 4634–4642. doi:10.1007/s11356-013-2389-z.

[1] "1-Octanesulfonic acid, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-". pubchem.ncbi.nlm.nih.gov.

[2] "Comparison of the chemical structural formula of 6:2 FTCA/6:2 FTSA and... | Download Scientific Diagram".

[3] "zwitterionic carboxybetaine polymer: Topics by Science.gov". www.science.gov.

[4] The use of PFAS and fluorine-free alternatives in fire-fighting foams, 2020

[5] Yang, Shih-Hung; Shan, Libo; Chu, Kung-Hui (2022). "Fate and Transformation of 6:2 Fluorotelomer Sulfonic Acid Affected by Plant, Nutrient, Bioaugmentation, and Soil Microbiome Interactions". Environmental Science & Technology. 56 (15): 10721–10731. doi:10.1021/acs.est.2c01867. PMC 10134682. PMID 35830472.

[6] Yang, Xiaoling; Huang, Jun; Zhang, Kunlun; Yu, Gang; Deng, Shubo; Wang, Bin (2014). "Stability of 6:2 fluorotelomer sulfonate in advanced oxidation processes: degradation kinetics and pathway". Environmental Science and Pollution Research. 21 (6): 4634–4642. doi:10.1007/s11356-013-2389-z.

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