Dye–Surfactant Interaction: Role of an Alkyl Chain in the Localization of Styrylpyridinium Dyes in a Hydrophobic Force Field of a Cationic Surfactant (CTAB)

The interaction of a number of cationic dyes (I) with a varying number of methylene groups (Cn) in the alkyl chain attached to pyridyl nitrogen with a cationic surfactant (CTAB) assembly is reported. The binding constant of the dyes (C5 to C18) with the micelle have been calculated, and are found to increase with increasing carbon chain. A plot of the binding constant vs. the chain length shows a curve with a maximum for C16, which is attributed to a compatibility factor. From studies of the electronic and emission spectra it is proposed that a micelle has a hydrophobic force field and that the dyes are localized in various pockets of the field.

[1]  M. Abe.  Macro- and microemulsions , 1998 .

[2]  M. Miguel,et al.  Oligomerization of cationic pyrene derivatives in the presence of sodium dodecyl sulfate: a route to nanoaggregate formation , 1995 .

[3]  D. F. Evans,et al.  Spectroscopic determination of the effective dielectric constant of micelle-water interfaces between 15 and 85.degree.C , 1988 .

[4]  Anunay Samanta,et al.  Polarity of the micelle-water interface as seen by 4-aminophthalimide, a solvent sensitive fluorescence probe , 1995 .

[5]  C. A. Bunton,et al.  Micellar-catalyzed hydrolysis of nitrophenyl phosphates , 1968 .

[6]  L. White,et al.  Theoretical study of the role of head-group interactions in the micellization of non-ionic surfactants , 1985 .

[7]  B. Kozankiewicz,et al.  Investigation of micelles, microemulsions, and phospholipid bilayers with the pyridinium N-phenolbetaine et(30), a polarity probe for aqueous interfaces , 1981 .

[8]  D. Shah.  Macro- and Microemulsions: Theory and Applications , 1985 .

[9]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[10]  F. Wilkinson,et al.  Photochemistry on surfaces: fluorescence emission quantum yield evaluation of dyes adsorbed on microcrystalline cellulose , 1992 .

[11]  A. Samanta,et al.  Photophysical studies on a fluorescence probe labelled fatty acid: chain folding in a micellar environment , 1996 .

[12]  I. Khmelinskii,et al.  Photochemistry on Surfaces: Matrix Isolation Mechanisms Study of Interactions of Benzophenone Adsorbed on Microcrystalline Cellulose Investigated by Diffuse Reflectance and Luminescence Techniques , 1995 .

[13]  G. D. Darling,et al.  Effect of temperature and viscosity on intramolecular charge-transfer fluorescence of a 4-p-dimethylaminostyrylpyridinium salt in protic solvents , 1995 .