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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

The unusual micelle micropolarity of partially fluorinated gemini surfactants sensed by pyrene fluorescence.

New gemini surfactants having two fluorocarbon chains were prepared by refluxing partially fluorinated alkyl bromide with N,N,N',N'-tetramethyl-1,6-diaminohexane in acetonitrile. The partially fluorinated gemini surfactants containing a six-methylene spacer chain are easily soluble in water. The critical micelle concentrations (cmc's) were determined by various fluorescent probe methods. The hydrophobicity of a CF(2) group was estimated to be 1.5 times that of a CH(2) group according to the cmc values. The micelle micropolarity of a fluorocarbon gemini sensed by pyrene fluorescence was unusually high, suggesting an apparent iceberg-like environment in the location of pyrene. The significantly small micelle aggregation numbers of fluorinated gemini surfactants were ascertained by the pyrene fluorescence quenching method. The micelle ionization degree estimated by fluorescence quenching of 6-methoxy-N-(3-sulfopropyl)quinolinium (SPQ) gave tendencies similar to those of the corresponding hydrocarbon geminis.[1]

References

  1. The unusual micelle micropolarity of partially fluorinated gemini surfactants sensed by pyrene fluorescence. Asakawa, T., Okada, T., Hayasaka, T., Kuwamoto, K., Ohta, A., Miyagishi, S. Langmuir : the ACS journal of surfaces and colloids. (2006) [Pubmed]
 
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