Equilibrium transformations of meso-methylated thiacarbocyanine in aqueous solutions

摘要: Equilibrium processes of dimerization and H*- J-aggregation 3,3′-di-(γ-sulfopropyl)-5,5′-dichloro-9-methylthiacarbocyanine (TCC) in aqueous solutions have been investigated, the thermodynamic parameters calculated. At least seven equilibrium forms TCC found solution for first time. The absorption bands dye attributed to various (M, D, H*, J) with allowance existence stereoisomers. aggregation numbers J- H*-aggregates calculated from dependence spectra on concentration solutions. It has shown that aggregates consisting a large number molecules are formed by “block” mechanism via intermediate steps formation dimers, or H*-tetramers, octamers, etc.