Abstract
Two novel quinacridone (QA) cyclophanes with intrinsic intramolecular dye-dye interactions have been designed and synthesized. X-ray crystal structures as well as detailed photophysical properties have been well demonstrated. These two dyes have a major advantage that efficient fluorescence quenching can be observed even in their dilute solutions. A comparison of photophysical properties between the dimeric QA cyclophane and its reference monomeric counterpart indicates that the dimerization is predominant for the fluorescence quenching of QA dyes in solution. This study provided some model QA derivatives with dimeric structures for understanding the fluorescence quenching of QA dyes in solutions.
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