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HERO ID
3858555
Reference Type
Journal Article
Title
NMR-STUDY OF CYCLODEXTRIN INCLUSION OF FLUOROCARBON SURFACTANTS IN SOLUTION
Author(s)
Guo, W; Fung, BM; Christian, SD
Year
1992
Is Peer Reviewed?
1
Journal
Langmuir
ISSN:
0743-7463
EISSN:
1520-5827
Volume
8
Issue
2
Page Numbers
446-451
Language
English
DOI
10.1021/la00038a022
Web of Science Id
WOS:A1992HG56600022
Abstract
The association of alpha-, beta-, and gamma-cyclodextrins with sodium perfluorobutanoate, sodium perfluoroheptanoate, sodium perfluorooctanoate, and sodium perfluorononanoate has been studied by F-19 NMR. First, the results suggest that the association of alpha-cyclodextrin with various fluorocarbon surfactants is fairly weak. The cavity of the host cyclodextrin is too small to accommodate the fluorocarbon chain to form an inclusion complex, but there exists an appreciable association between the tail of the surfactant and alpha-cyclodextrin. Secondly, the cavity of beta-cyclodextrin is large enough to accommodate the fluorocarbon chain, but the latter is forced to adopt an extended, possibly all-trans conformation to fit into the cavity. For perfluorosurfactants having a short fluorocarbon chain, a 1:1 complex is formed. When the fluorocarbon chain is longer, 2:1 complexation becomes significant for higher concentrations of beta-cyclodextrin. Thirdly, gamma-cyclodextrin forms a 1:1 complex with fluorocarbon surfactants. The complexation is stronger than that in the alpha-cyclodextrin/surfactant system but weaker than that in the beta-cyclodextrin/surfactant system. The association constants for the 1:1 complexes have been calculated from the dependence of the F-19 NMR chemical shift on the concentration of cyclodextrin.
Tags
PFAS
•
Expanded PFAS SEM (formerly PFAS 430)
Sodium perfluorooctanoate
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFNA (375-95-1)
Literature Search
WOS
PFHpA (375-85-9)
Literature Search
WOS
PFBA (375-22-4)
Literature Search
WOS
•
PFBA
Literature Search
WOS
Screening Results
Excluded/Not on Topic
Protocol References
Scopus: April 2021
•
PFHpA
Literature Search
WOS
Screening Results
Excluded/Not on Topic
•
PFNA
Literature Search (August 2017)
PFNA Literature Search pre-2019
WOS
Literature Search
WOS
Screening Results
Excluded/Not on Topic
Title and Abstract Screening
Excluded
Not relevant to PECO
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