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 with
fluorescent probes which are intrinsic insurfactant molecules or externally introduced. Quench-
lng or pyrene monomer fluorescence by alkyltriphenylphosphonium or N-alkylpyridinium
obeys Stern-Voimer equation, being diffusi6n-controlled dynamic quenching, but the behavior
of 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 the
aqueous solution of cetyltrimethylammonium bromide (CTMAB), and the inhibition (for cationic
quenchers) and promotion (for anionic quenchers) effects of CTMAB on the quenching of
pyrene fluorescence are also observed. The self-coiling conformation of ionic surfactant
molecules in aqueous solution is proposed to be responsible for these observations and the
conformation to be dynamic. |
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Keywords: | molecular conformation ionic surfactant fluorescence quenching excimer |
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