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

被引：27

作者：

Karukstis, Kerry K. ^{[1
]}

Litz, Jonathan P. ^{[1
]}

Garber, Matthew B. ^{[1
]}

Angell, Laura M. ^{[1
]}

Korir, George K. ^{[1
]}

机构：

[1] Harvey Mudd Coll, Dept Chem, Claremont, CA 91711 USA

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2010年 / 75卷 / 04期

基金：

美国国家科学基金会;

关键词：

Micelle; Solvatochromism; Azo dye; Tautomer; Absorbance spectroscopy; HYDROXIDE SURFACTANTS; SPONTANEOUS VESICLES; MOLECULAR-INTERACTIONS; MICELLES; SOLUBILIZATION;

D O I：

10.1016/j.saa.2009.12.087

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

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,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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1354 / 1361

页数：8