Perfluoro(4-ethylcyclohexane)sulfonic acid

Perfluoro(4-ethylcyclohexane)sulfonic acid
Names
	IUPAC name 1,2,2,3,3,4,5,5,6,6-decafluoro-4-(pentafluoroethyl)cyclohexane-1-sulfonic acid
	Other names Perfluoro(perfluoroethyl)cyclohexanesulfonic acid; PFEtCHxS; PFECHS;
Identifiers
CAS Number	646-83-3;
3D model (JSmol)	Interactive image;
ChemSpider	91843;
PubChem CID	101650;
CompTox Dashboard (EPA)	DTXSID70275965 ;
	InChI InChI=1S/C8HF15O3S/c9-1(4(14,15)8(21,22)23)2(10,11)5(16,17)7(20,27(24,25)26)6(18,19)3(1,12)13/h(H,24,25,26) Key: ICKAEAFPESRWOT-UHFFFAOYSA-N;
	SMILES C1(C(C(C(C(C1(F)F)(F)F)(F)S(=O)(=O)O)(F)F)(F)F)(C(C(F)(F)F)(F)F)F;
Properties
Chemical formula	C8HF15O3S
Molar mass	462.13 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Perfluoro(4-ethylcyclohexane)sulfonic acid (PFEtCHxS) is a synthetic perfluorinated alkyl substance that has been used as a surfactant and in various industrial applications.

Chemical properties

PFEtCHxS is a colorless liquid at room temperature and has a high surface tension, making it suitable for use as a surfactant.

The molecule contains two chiral centers.

Applications

PFEtCHxS has been employed in various industrial processes, including:[1]

Metal plating and finishing operations
Semiconductor manufacturing
Photolithography processes

Its surfactant properties and resistance to extreme conditions make it useful in these applications.

Environmental concerns

Like other perfluorinated compounds, PFEtCHxS is highly persistent in the environment and has been detected in various environmental matrices, including water, soil and biota. There are concerns about its potential bioaccumulation and adverse effects on human health and ecosystems.[2][3]

References

Gilchrist, Maya (December 2022). "PFAS in the metal plating and finishing industry" (PDF). Minnesota Pollution Control Agency. Retrieved 2024-06-10.
"Perfluoroethylcyclohexane Sulfonate (PFECHS) : Current Knowledge of Physiochemical Properties, Environmental Contamination and Toxicity : Whitepaper" (PDF). May 15, 2020.
Wang, Qi; Ruan, Yuefei; Jin, Linjie; Tao, Lily S. R.; Lai, Han; Li, Guifeng; Yeung, Leo W. Y.; Leung, Kenneth M. Y.; Lam, Paul K. S. (2023-05-23). "Legacy and Emerging Per- and Polyfluoroalkyl Substances in a Subtropical Marine Food Web: Suspect Screening, Isomer Profile, and Identification of Analytical Interference". Environmental Science & Technology. 57 (22): 8355–8364. Bibcode:2023EnST...57.8355W. doi:10.1021/acs.est.3c00374. PMC 10249352. PMID 37220884.

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[1] Gilchrist, Maya (December 2022). "PFAS in the metal plating and finishing industry" (PDF). Minnesota Pollution Control Agency. Retrieved 2024-06-10.

[2] "Perfluoroethylcyclohexane Sulfonate (PFECHS) : Current Knowledge of Physiochemical Properties, Environmental Contamination and Toxicity : Whitepaper" (PDF). May 15, 2020.

[3] Wang, Qi; Ruan, Yuefei; Jin, Linjie; Tao, Lily S. R.; Lai, Han; Li, Guifeng; Yeung, Leo W. Y.; Leung, Kenneth M. Y.; Lam, Paul K. S. (2023-05-23). "Legacy and Emerging Per- and Polyfluoroalkyl Substances in a Subtropical Marine Food Web: Suspect Screening, Isomer Profile, and Identification of Analytical Interference". Environmental Science & Technology. 57 (22): 8355–8364. Bibcode:2023EnST...57.8355W. doi:10.1021/acs.est.3c00374. PMC 10249352. PMID 37220884.