Studies of Spin Labeled Sodium Dodecyl Sulfate. I. Synthesis and Properties

Article abstract of DOI:10.1246/bcsj.53.372

Nitroxide spin labeled surfactant, sodium salt of 2-ethyl-2-<9-(hydroxysulfonyloxy)nonyl>-4,4-dimethyloxazolidin-3-yloxyl, was synthesized and some properties of the compound were studied by means of ESR and conductivity measurements.From conductivity measurements it was found that the critical micelle concentration of the compound was 21.6 mmol kg^-1 at 25.0 +/- 0.1 deg C and the micelle consisted of a small number of labeled surfactant ions.The ESR spectra of the labeled surfactant were measured as a function of concentration and temperature.These spectra showed a typical pattern interpreted in terms of spin exchange.Regarding spin exchange as chemical reaction, second order rate constant was determined from the analysis of line width and compared with the values obtained by diffusion controlled model.