The Interaction Between 4-Dicyanovinyl-N,N-dimethylaniline with Surfactants

doi:10.7517/j.issn.1674-0475.2007.05.333

Abstract

Abstract: Since 4-dicyanovinyl-N,N-dimethylaniline (DCVA) is a prototype class of organic donor-acceptor compound, which is sensitive to microenvironmental properties such as polarity, viscosity and hydrogen bonding capacity. Interactions of DCVA with sodium dodecylsulphate (SDS), dodecyltrimethylammonium bromide (DTAB) ,and polyoxythylene (23) laurylether (BRIJ35) have been investigated by measuring the fluorescent spectra of DCVA in aqueous solutions of varying concentrations surfactants. The fluorescent intensities of DCVA are enhanced approximately 5.1-fold, 5.4-fold,and 3.3-fold by DTAB, BRIJ 35 ,and SDS micelles compared with that in aqueous solution, as well as the emission maximum wavelengths of DCVA blue-shift 5, 11,and 9 nm, respectively. In addition, according to the emission maximum wavelengths of DCVA in micelles, the microenvironment polarities of binding sites of DCVA in DTAB and BRIJ 35 micelles are similar, but that of DCVA in SDS micelle is obviously higher. The binding constants are calculated by the fluorescence intensities of DCVA in the three kinds of micelles to be 1.7×10³,1.4×10³,and 8.8×10²,respectively.

Key words: surfactant, fluorescence, micelles, 4-dicyanovinyl-N,N-dimethylaniline, probe

CLC Number:

O648

WANG Jin-ling, GUO Xiang-feng, JIA Li-hua. The Interaction Between 4-Dicyanovinyl-N,N-dimethylaniline with Surfactants[J]. Imaging Science and Photochemistry, 2007, 25(5): 333-339.

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