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Abstract Two cyanyl-carboxylic derivatives (PYCZA and TPYCZA) have been designed and synthesized with flexible or rigid substituents, respectively. The persistent phosphorescence mechanism was studied through temperature-dependent Raman spectroscopy, and single/powder… Click to show full abstract
Abstract Two cyanyl-carboxylic derivatives (PYCZA and TPYCZA) have been designed and synthesized with flexible or rigid substituents, respectively. The persistent phosphorescence mechanism was studied through temperature-dependent Raman spectroscopy, and single/powder X-ray diffraction. The low temperature shortened intermolecular distance and enhanced intermolecular interactions, fluorescence emission (1.5 fold for TPYCZA, 1.6 fold for PYCZA) and the luminescent lifetime (1.23 × 107 fold for TPYCZA, 1.43 × 109 fold for PYCZA). The results provide a fundamental basis for the design of organic molecules with extended luminescence lifetimes, which broadens the scope for phosphorescent materials with thermochromic properties.
Journal Title: Dyes and Pigments
Year Published: 2020
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