A spectral approach to determine location and orientation of azo dyes within surfactant aggregates

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Kerry K KarukstisGeorge K Korir

Abstract

The UV-vis absorption properties of azo dyes are known to exhibit a variation with the polarity and acidity of the dye environment. The spectral properties of a series of anionic azo dyes were characterized to further probe the interaction of these dyes with two types of surfactant aggregates: (1) the spherical micelles formed in aqueous solution by alkyltrimethylammonium bromide (C(n)TAB) surfactants with n=10-16 and (2) the unilamellar vesicles spontaneously formed in water from binary mixtures of the oppositely-charged double-tailed surfactants cationic didodecyldimethylammonium bromide (DDAB) and anionic sodium dioctylsulfosuccinate (Aerosol OT or AOT). The observed dye spectra reflect the solvatochromic behavior of the dyes and suggest the location and orientation of the dye within the surfactant aggregates. Deconvolution of the overall spectra into sums of Gaussian curves more readily displays any contributions of tautomeric forms of the azo dyes resulting from intramolecular hydrogen bonding. The rich variation in UV/vis absorption properties of these anionic azo dyes supports their use as sensitive tools to explore the nanostructures of surfactant aggregates.

References

Aug 28, 1984·Biochemistry·N E Gabriel, M F Roberts
Nov 23, 2000·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·B B LuokkalaR M Suter
Jun 15, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Kerry K Karukstis, James R McDonough

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Citations

Mar 27, 2012·Journal of Colloid and Interface Science·A R Tehrani-BaghaK Holmberg
Aug 25, 2016·Journal of Molecular Modeling·Moisés Domínguez, Marcos Caroli Rezende

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