Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, College of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Mar;104:419-22. doi: 10.1016/j.saa.2012.11.102. Epub 2012 Dec 7.
Five pyridyl-β-diketones were synthesized by Claisen condensation of ethyl nicotinate with various aryl methyl ketones in benzene in the presence of sodium amide as the base, and then reacted with boron trifluoride diethyl etherate in dichloromethane to afford some new boron difluoride pyridyl-β-diketonate derivatives. The compounds obtained were characterized using FTIR, (1)H NMR, elemental analysis and mass spectrometry. Their optical properties were studied in DMF by UV-vis absorption and fluorescence spectroscopy. The results showed that these boron complexes exhibited intense fluorescence in the blue-green region (420-490 nm) under UV radiation with a relatively high quantum yield. Especially, compounds 4b and 5b displayed much higher quantum yield as compared to compounds 1b, 2b and 3b.
五种吡啶-β-二酮通过在苯中用烟酸钠作为碱，使烟酸乙酯与各种芳基甲基酮进行克莱森缩合反应合成，然后与二氯甲烷中的三氟化硼乙醚反应，得到一些新的硼酸二氟吡啶-β-二酮衍生物。用 FTIR、(1)H NMR、元素分析和质谱对所得到的化合物进行了表征。它们的光学性质在 DMF 中通过紫外-可见吸收和荧光光谱进行了研究。结果表明，这些硼配合物在紫外辐射下在蓝绿色区域（420-490nm）显示出强烈的荧光，具有较高的量子产率。特别是化合物 4b 和 5b 的量子产率明显高于化合物 1b、2b 和 3b。
