Abstract
AbstractWe have designed a Malachite Green leuconitrile carrying a long‐alkyl‐chain which controls micelle formation photochemically. The Malachite Green derivative, when ionized photochemically, exhibits some hydrophilicity by its triphenylmethyl cation and some hydrophobicity by its long alkyl chain. The behavior of the photoresponsive Malachite Green surfactant was studied in mixed micelle solutions containing cetyltrimethylammonium chloride (CTAC) and a small quantity of the Malachite Green. We found that UV irradiation drastically decreased the critical micelle concentration (cmc) of the mixed micelle solutions and that the Malachite Green derivative realized photoinduced uptake of oily substances based on its photogenerated amphiphilicity. The mechanism of the photoinduced enhancement of solubilizing oily substances is discussed at the viewpoint of the microscopic location of the Malachite Green surfactant in the micelle. Copyright © 2007 John Wiley & Sons, Ltd.
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