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Formation of J aggregates, that is, one-dimensional supramolecular self-organizations in which the transition moments of individual molecules are aligned parallel to the line joining their centers through a "head-to-tail" arrangement, normally proceed via electrostatic interactions between oppositely charged molecular groups; this is facilitated by an electrolyte medium. [4,5] The question of how one-dimensional (1D) chains of J aggregates grow and remain stable has long interested scientists, who have proposed different models for their formation. The reverse process is also demonstrated by application of light of the correct wavelength to induce excitation of the J aggregates.