Pyrene-tiaraed pillar[5]arene: Strong intramolecular excimer emission applicable for photo-writing

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A pyrene-tiaraed pillar[5]arene derivative was synthesized, which showed a concentration-independent intensive excimer emission. Photolysis of the pyrene-tiaraed pillar[5]arene led to a switch from excimer to monomer emission, applicable to photo-writing.
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