3 years ago

Rational design of slightly twisted coumarin molecules with remarkable solution and solid dual efficient luminescence

Rational design of slightly twisted coumarin molecules with remarkable solution and solid dual efficient luminescence
Endowing slightly twisted molecules highly emissive in both solution and solid state is of great importance for understanding the principle of maximizing the luminescent efficiency of luminophores. To this end, a series of slightly twisted coumarin luminophores CMs with different alkoxyl substituents at the 7-positions were synthesized. The effect of the substitutes on the diversity photophysical properties of the four compounds in solution, THF/H2O mixtures and solid state were investigated. Comparing to the referenced compound CM (3-p-tolyl-2H-chromen-2-one) that without a substitute, the introduced electron-rich alkoxyl substitutes not only enhanced the intramolecular charge transfer (ICT) effect, but also significantly modified their molecular packing patterns in the crystals. The combined effect of increasing the radiative and suppressing the nonradiactive pathways boosted the luminescence efficiency of CM1-CM3 in solution and the solid state simultaneously. Eventually, compound CM2 with an ethoxyl substitute exhibited the strongest blue emission with fluorescence quantum yields as high as 73.2% and 96.7% in solution and the solid state, respectively. This work presents an efficient strategy towards dual strong fluorescent luminophores in both solution and the solid state.

Publisher URL: www.sciencedirect.com/science

DOI: S014372081731625X

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