MOLECULAR CONFORMATION OF IONIC SURFACTANTS IN AQUEOUS SOLUTION |
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Authors: | JIANG YUN-BAO XU JIN-GOU CHEN GUO-ZHEN |
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Affiliation: | JIANG YUN-BAO,XU JIN-GOU,CHEN GUO-ZHEN Department of Chemistry,Xiamen University,Xiamen 361005,PRC |
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Abstract: | The molecular conformation of ionic surfactant in aqueous solution is investigated withfluorescent probes which are intrinsic insurfactant molecules or externally introduced. Quench-lng or pyrene monomer fluorescence by alkyltriphenylphosphonium or N-alkylpyridiniumobeys Stern-Voimer equation, being diffusi6n-controlled dynamic quenching, but the behaviorof quenching with different lengths of alkyl chain is "abnormal", i.e. the longer the chain,the greater the quenching rate constant. The pyrene excimer fluorescence is observed in theaqueous solution of cetyltrimethylammonium bromide (CTMAB), and the inhibition (for cationicquenchers) and promotion (for anionic quenchers) effects of CTMAB on the quenching ofpyrene fluorescence are also observed. The self-coiling conformation of ionic surfactantmolecules in aqueous solution is proposed to be responsible for these observations and theconformation to be dynamic. |
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Keywords: | molecular conformation ionic surfactant fluorescence quenching excimer |
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