Effect of pH Values on Resonance Raman Spectra of Brilliant Yellow in Aqueous and CTAB Micella Solutions

Abstract

Abstract: Resonance Raman spectra of brilliant yellow (BY) in aqueous and cetyltrimethylammonium bromide (CTAB) micella solutions were measured at various pH values. Two spectral patterns under acidic and basic conditions are ascribed to correspond azo and quinoid forms of BY, respectively, which can be employed as a measure of the surface potentical and microenvironment of the micelle . According to Heeseman, the pK_a= [pK_a(surface) -pK_a(aqueous)] is estimated to be about 0. 8 and is related to the change of the surface potential.

Key words: Brilliant yellow, Raman spectra, Micella surface

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Zhang Yunhong, Tian Yongchi, Liang Yingqiu . Effect of pH Values on Resonance Raman Spectra of Brilliant Yellow in Aqueous and CTAB Micella Solutions[J]. Chem. J. Chinese Universities, 1990, 11(8): 887.

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Effect of pH Values on Resonance Raman Spectra of Brilliant Yellow in Aqueous and CTAB Micella Solutions

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