Transition of H- and J-aggregate of a cyanine dye based on cation embedded in aggregation

J-aggregate of a cyanine dye induced by potassium ions from H-aggregate in solution, form a hypochromic complex by the addition of a nonionic ligand (18-crown-6 ether), and the spectral studies and NMR measurements indicate that the transition from J-aggregate to H-aggregate has been achieved.