Volume constraint effect on solute partitioning to Triton X-100 micelles in water

Tohru Saitoh, Hitoshi Hoshino, Takao Yotsuyanagi

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20 Citations (Scopus)


On the basis of the simple two-phase model the partition constants (Kd) of various organic solutes and metal chelates between aqueous and Triton X-100 micellar phases are derived spectrophotometrically. The magnitude and the order of Kd are discussed in terms of molecular size, hydrophilicity and ion-association character of the solutes. The Kd values of neutral species increase almost linearly with their van der Waals molar volumes until the critical value near 110 ml mol-1 is reached. Above this critical volume, the constraint effect of the micelles gives rise to severe levelling off the partition constants at ca. 103.0 for bulky solutes. The Kd values of 2-(thiazol-2-ylazo)-4-tert-octylphenol, 2-(thiazol-2-ylazo)-4-methylphenol (HL) and the metal chelates of [FeIIL2] and [NiIIL2] are in a very narrow range of 102.83, 102.93, 103.06 and 103.16, respectively. The effects of micellar size are also examined using Brij-35 and Brij-58 surfactants.

Original languageEnglish
Pages (from-to)479-486
Number of pages8
JournalJournal of the Chemical Society, Faraday Transactions
Issue number3
Publication statusPublished - 1994 Dec 1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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