Abstract
The influence of anionic sodium dodecyl sulphate (SDS) on aggregation behavior of squaraine dye Sq-2Me has been studied in dimethylformamide–water (95%) (DMF–W) binary solutions by optical spectroscopy. The addition of surfactants at concentrations above the critical micelle concentration into a DMF–W (95%) solution is found to promote the dye ordered aggregation. The structure of Sq-2Me aggregates formed is analyzed using the exciton theory. In solutions with SDS micelles, formation of Sq-2Me J-type dimers of co-planar inclined geometry with an angle between the chromophore long axes and chromophore center-to-center line ( θ) of 47 ° and center-to-center distance ( R) of 5 Å has been revealed. The interaction of Sq-2Me with other hydrophobic molecules (carbocyanine dye DiI) solubilized at equal concentrations in SDS micelles is revealed to prevent the Sq-2Me dimer formation. In such a solution, fluorescent resonance energy transfer between donor dye DiI and acceptor Sq-2Me is observed.
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