Influence of 1,3,5-triazine Core and Electron Donor Group in Photophysical Properties of BODIPY Dyes
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The relationship between the number of BODIPY in a compound and the increase on its fluorescence has been established such as an aggregation induced by multiple BODIPY. We aimed to determine the influence of an electron donor substituent in the BODIPY-triazine system. In this sense, as a first step, we collected data such as photophysical characteristics about BODIPY without substituent and meso-triazine-BODIPY system. Then, three more meso-triazine-BODIPY were synthetized by Lyndsey method. In addition, absorption and emission spectra, fluorescence quantum yields and time-resolved fluorescence data were obtained. Furthermore, solvatochromism was determined by solvent descriptors and photophysical parameters. Finally, the results showed that the triazine core stabilized the system and we observed that the number of BODIPY increased fluorescence mainly in polar solvents. While electron donation maintained the conjugation that reduced the influence of the solvent on the photophysical characteristics.
Keywords1,3,5-triazine BODIPY Solvatochromism Fluorescence
The authors gratefully acknowledge the financial support of Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Grants numbers 165417/2014-5 and 168073/2017-0) and CAPES (This work was carried out with the support of the Coordination of Improvement of Higher Education Personnel - Brazil (CAPES)- Financing code 001). We also would like to acknowledge the Analytical Centre of NPPNS (FCFRP-USP, Brazil) for the Mass Spectrometry analysis.
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