کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
175583 | 458914 | 2015 | 9 صفحه PDF | دانلود رایگان |
• Pyrenyl-substituted “push–pull” 4-RO-thiazoles were synthesized.
• They exhibits fluorescence in solution at 598–626 nm with quantum yields 0.19–0.29.
• Large Stokes shifts (up to 8500 cm−1) were observed.
• Solid-state fluorescence at ∼590–640 nm with quantum yields 0.04–0.15 was observed.
• Time-resolved fluorescence, (TD)DFT and X-ray-diffraction studies were performed.
4-Hydroxy-5-nitrophenyl-2-(pyren-1-yl)thiazole and a series of its O-substituted derivatives were synthesised. These compounds are fluorescent in solution, emitting light in the region 598–626 nm with quantum yields 0.19–0.29. Large Stokes shifts, approaching 8500 cm−1, were explained by the intramolecular charge transfer character of the lowest excited state, confirmed by TD DFT calculations. The O-substituted compounds also exhibited fluorescence in the solid state. The lack of solid-state emissive properties of the parent hydroxythiazole and the emission of its O-acetyl derivative are discussed in terms of their crystal packings.
Figure optionsDownload as PowerPoint slide
Journal: Dyes and Pigments - Volume 121, October 2015, Pages 290–298