Me, myself, and dye: Core-unsubstituted perylene bisimide dyes bearing a melamine hydrogen-bonding unit link with cyanurates giving H- (red, see picture) and J-aggregates (green). In solution the aggregates can interconvert on thermal treatment or by changing the stoichiometry. In solid films the green to red color change occurs upon scratching the surface.
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Yagai et al. (2008) studied this question.
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