Formation of premicellar clusters of 2-p-toluidinonaphthalene-6-sulfonate with cationic detergents

Journal Article · Fri May 01 04:00:00 EDT 1992 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00041a007· OSTI ID:5526098

Niu, S; Gopidas, K R; Turro, N J ^[1]; Gabor, G ^[2]

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1. Columbia Univ., New York, NY (United States)
2. Israel Inst. for Biological Research, Ness-Ziona (Israel)

2-p-toluidinonaphthalene-6-sulfonate (TNS), a well-known fluorescent probe, forms premicellar aggregates with detergents such as cetyltrimethylammonium bromide (CTAB) at concentrations just below their critical micelle concentration. A narrow fluorescent band, very small Stokes shift, and very high quantum yield are the characteristics of the hydrophobic environment provided by the premicellar aggregates. Studies of the temperature dependence of fluorescence indicated that these species exist in solution as a separate microheterogeneous phase. These results are corroborated by results obtained from fluorescence polarization studies. The length of the alkyl chain is very critical in this case, and no such phenomenon is observed when the chain length is less than 14 carbon atoms. We propose that these species are formed by the enwrapment of TNS by the alkyl chains of CTAB molecules. 12 refs., 7 figs., 3 tabs.

• OSTI ID: 5526098
• Journal Information: Langmuir; (United States), Journal Name: Langmuir; (United States) Vol. 8:5; ISSN LANGD5; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ADDITIVES
AGGLOMERATION
DETERGENTS
DYES
EMULSIFIERS
FLUORESCENCE
LUMINESCENCE
MICELLAR SYSTEMS
SURFACTANTS
WETTING AGENTS