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Article Abstract
An acridine unit entangled into a macrocyclic derivative forms a very efficient fluorophore featuring the confinements of a 7.6.6 defect. The designed and unoccupied internal cavity in the significantly rigidified environment changes the optical properties, serving as a switch between on and off states. The observed behaviour unequivocally confirms a dominating influence of the hydrogen-like interaction for quenching the emission properties within organic chromophores.
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