Self-assembly of tartrazine molecules in water- dimethylsulphaxide solution
Abstract
Abstract Spectroscopic and theoretical calculations have shown that the self-aggregation of tartrazine molecules occurs in an aqueous and water-dimethylsulphaxide solution with a hypochromic effect in their electronic spectra. The deformation of the absorption spectra is accompanied by long-wave broadening. The absorption band of the dye E102 self-aggregates corresponds to the maxima λ max =463nm and λ max =483nm. Studies of the linear dichroism spectra have established that tartrazine self-aggregates, which have a needle-like structure, have optical activity. These data are the passport characteristics of self-assembled tartrazine molecules and they can be used to determine the nativity of dye self-aggregates. It is established that by selecting the concentration and ratios of binary solvent mixtures, it is possible to regulate the number of molecules in the self-aggregated dye molecules. The integration of tartrazine molecules into self-aggregates occurs by Van der Waals forces.