Cryptand 222 complexation of anionic surfactant counterions. Drastic decrease of the critical micelle concentration of sodium dodecyl and sodium decyl sulfates

Pablo A. Quintela, Richard C S Reno, Angel Kaifer

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The addition of equimolar amounts of cryptand 222 to solutions containing either sodium dodecyl sulfate (SDS) or sodium decyl sulfate (SdecS) was shown to lower the critical micelle concentration (cmc) of both surfactants by a factor of nearly 5, as measured by surface tension plots and changes in the fluorescence characteristics of pyrene. The cmc values for C222Na+DS- and C222Na+decS- were calculated to be 1.4 and 6.8 mM, respectively. In addition, cryptand complexation of the sodium counterions diminishes the hydrophobicity of the micellar hydrocarbon core. These findings were interpreted as the result of differences in the counterion location: the sodium counterions reside in the outer side of the micelle head-group region while the more hydrophobic sodium cryptate counterions are interspersed among the head groups, acting like spacers, decreasing interionic repulsions in the Stern layer, and favoring a greater extent of water penetration into the micellar structure.

Original languageEnglish
Pages (from-to)3582-3585
Number of pages4
JournalJournal of Physical Chemistry
Volume91
Issue number13
StatePublished - Dec 1 1987

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Sodium sulfate
Anionic surfactants
Critical micelle concentration
Complexation
sodium sulfates
micelles
Sodium
surfactants
sodium
Pyrene
Sodium dodecyl sulfate
Micelles
pyrenes
Hydrophobicity
hydrophobicity
Hydrocarbons
Surface-Active Agents
Sodium Dodecyl Sulfate
spacers
Surface tension

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Cryptand 222 complexation of anionic surfactant counterions. Drastic decrease of the critical micelle concentration of sodium dodecyl and sodium decyl sulfates. / Quintela, Pablo A.; Reno, Richard C S; Kaifer, Angel.

In: Journal of Physical Chemistry, Vol. 91, No. 13, 01.12.1987, p. 3582-3585.

Research output: Contribution to journalArticle

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N2 - The addition of equimolar amounts of cryptand 222 to solutions containing either sodium dodecyl sulfate (SDS) or sodium decyl sulfate (SdecS) was shown to lower the critical micelle concentration (cmc) of both surfactants by a factor of nearly 5, as measured by surface tension plots and changes in the fluorescence characteristics of pyrene. The cmc values for C222Na+DS- and C222Na+decS- were calculated to be 1.4 and 6.8 mM, respectively. In addition, cryptand complexation of the sodium counterions diminishes the hydrophobicity of the micellar hydrocarbon core. These findings were interpreted as the result of differences in the counterion location: the sodium counterions reside in the outer side of the micelle head-group region while the more hydrophobic sodium cryptate counterions are interspersed among the head groups, acting like spacers, decreasing interionic repulsions in the Stern layer, and favoring a greater extent of water penetration into the micellar structure.

AB - The addition of equimolar amounts of cryptand 222 to solutions containing either sodium dodecyl sulfate (SDS) or sodium decyl sulfate (SdecS) was shown to lower the critical micelle concentration (cmc) of both surfactants by a factor of nearly 5, as measured by surface tension plots and changes in the fluorescence characteristics of pyrene. The cmc values for C222Na+DS- and C222Na+decS- were calculated to be 1.4 and 6.8 mM, respectively. In addition, cryptand complexation of the sodium counterions diminishes the hydrophobicity of the micellar hydrocarbon core. These findings were interpreted as the result of differences in the counterion location: the sodium counterions reside in the outer side of the micelle head-group region while the more hydrophobic sodium cryptate counterions are interspersed among the head groups, acting like spacers, decreasing interionic repulsions in the Stern layer, and favoring a greater extent of water penetration into the micellar structure.

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