Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 13, Issue 20, Pages 5775-5782Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ob00607d
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Funding
- Natural Science Foundation of China [21301085]
- Natural Science Foundation of Shandong Province [ZR2011BQ010]
- Liaocheng University Funds for Young Scientists [31805]
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Two pyridine-ketoiminate-based organoboron complexes (2 and 3) were developed. 2 and 3 showed very weak emission in low-viscosity organic solvents because of the intramolecular rotation induced non-radiative process. Their emission can be dramatically enhanced by the increase in solvent viscosity or by molecular aggregation in the solid state. Moreover, 2 and 3 exhibited intense emission with high quantum yield of 0.53 and 0.46, respectively. X-ray crystallographic analysis showed that the weak intermolecular interactions such as C-H center dot center dot center dot F and C-H center dot center dot center dot pi by fixing the molecular conformations of 2 and 3 were responsible for intense luminescence in the solid state. The large Stokes shifts and high efficient solid-state emission of 2 and 3 make them valuable AIE luminophores for further potential applications in the fields of fluorescence imaging and materials science.
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