Abstract
The fluorescence properties of four carbocyanine-type probes which can be excited by the HeNe-laser are investigated. Their fluorescence emission is red shifted and drastically enhanced in solutions of non-ionic and cationic detergents at above the critical micellar concentration (CMC) as a result of the adsorption of the dye at the surface of the micelles. Since, at the same time, the absorption band is also shifted towards the 633 nm line, a drastic enhancement of the absorbance is also observed upon micellization. The most proper dye (2a) provides a fivefold increase of the 633 nm absorption in micellar solution of Triton X100 as compared to detergent solutions of below the CMC. It is shown that the CMC can be determined from the emission data of detergent solutions. The experimental data obtained with probe 2a are in agreement with the published values for a cationic, a neutral, and an anionic model detergent. The dyes (in particular 2a) are therefore considered as new useful probes for a sensitive determination of the CMC by laser fluorescence spectroscopy.
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