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Kinetics of intra- and intermolecular excited-state proton transfer ofω-(2-hydroxynaphthyl-1)-decanoic acid in
Kyril M Solntsev1,2,3, Alexander V Popov3, Vera A Solovyeva1
1Department of Chemistry, Moscow M. V. Lomonosov University, Sparrow Hills, Moscow, 119991, Russia.
Abstract:
The bifunctional photoacidω-(2-hydroxynaphthyl-1)-decanoic acid (1S2N) takes part both in intramolecular excited-state proton transfer (ESPT) to the anion of a fatty acid and in intermolecular ESPT in the presence of a water solvent. Excited-state intra- and intermolecular proton transfer of 1S2N was investigated in homogeneous ethanol/water solution and in micellar solutions of various surfactants. The interfacial potential of micelles was changed by using cationic (CTAB), non-ionic (Brij-35) and anionic (SDS) surfactants. With the decrease of the interfacial potential, the protolytic photodissociation of naphthol and the diffusion-controlled intramolecular ESPT to carboxylic anion were suppressed.
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