陽イオン界面活性剤水溶液中のケイ光物質のケイ光挙動

抄録

Fluorescence spectra of 4-methyl-7-anilinocoumarin (MAC), 4-methyl-7-diethylaminocoumarin (MDC) and dansyl-_L-alanine (DNS-L-Ala) were measured in aqueous solutions of cationic surfactants.
MDC and DNS-L-Ala form complexes with dodecyl pyridinium chloride (DPC) and the intensities of fluorescence decrease with increasing concentration of DPC. On the other hand, aqueous solutions of DPC does not quench the fluorescence of MAC.
The CMC of octadecyltrimethylammonium chloride (OTAC) was determined by the measurement of the change of the fluorescence intensity of MAC or MDC in aqueous solutions of OTAC. This CMC was higher than that determined by the measurement of specific electric conductivity.
It was recognized that when MAC and MDC were solubilized into OTAC micelle, the polarities of these solutions are 27 and 47 in units of dielectric constant, respectively.