Abstract
The aggregation of some 7H-indolo[1,2-a]quinolinium dyes in aqueous solution was investigated based on UV–vis spectroscopy. The influence of pH, dye concentration, ionic strength and the addition of organic solvents on the process was studied. The aggregation took place in alkaline solution and was strongly affected by ionic strength and the presence of organic solvents. The existence of aggregates in the solution was manifested in a new band appearance which exhibited bathochromic shift with respect to the monomer band. For all studied dyes the band was assigned to the dimer and the equilibrium constants for dimer formation were calculated. The dye tendency to aggregate was determined by its structure and was enhanced by the presence of naphthalene moiety in comparison to that of benzene ring as well as electron-rich substituents such as halogens.
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