Bulletin of the Chemical Society of Japan p. 929 - 934 (1995)
Update date:2022-08-30
Topics:
El-Shishtawy, Reda M.
Fukunishi, Koushi
The synthesis of long chain malachite green leuco base (LMGH) is reported.The absorption spectra of LMGH in different solvents seem to be independent of the solvent polarity (dielectric constant), while the emission spectra are dependent on it.Slight fluorescence self-quenching of LMGH in methanolic solution appears at a concentration of ca. 4*10-5 mol dm-3 and it becomes the dominant factor above 2*10-4 mol dm-3.The effect of the long chain on the basicity of LMGH relative to that of malachite green leuco base (MGH) can be revealed by the fluorescence quenchi ng of both compounds by Fe3+.The quenching process obeys a static type of mechanism, which is followed by an electron transfer of LMGH to Fe3+.The fluorescence quenching efficiency of micellized LMGH by Fe3+ is very dependent on the charge of the micelle, and is most effective in sodium dodecyl sulfate (SDS) micelle.The color appearance of the dye from LMGH upon mixing with Fe3+, is easily observed in methanol, but not in SDS micelle.The critical micelle concentrations (cmc) of anionic (SDS) and cationic (hexadecyltrimethylammonium chloride, CTAC) micelles have been estimated using LMGH as a probe.
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