Synthesis of highly fluorescent coumarinyl chalcones derived from 8-acetyl-1,4-diethyl-1,2,3,4-tetrahydro-7H-pyrano[2,3-g]quinoxalin-7-one and their spectral characteristics

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• 作者：Amit R. Jagtap^a ; Vijay S. Satam^a ; Rajkumar N. Rajule^a ; Vinod R. Kanetkar ; ^a ; ^{vrkanetkar@gmail.com"" rel=""nofollow}
• 关键词：Coumarin ; 8-Acetyl-1 ; 4-diethyl-1 ; 2 ; 3 ; 4-tetrahydro-7H-pyrano[2 ; 3-g]quinoxalin-7-one ; Benzaldehyde ; Chalcones ; Fluorescence ; Thermal stability
• 刊名：Dyes and Pigments
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：91
• 期：1
• 页码：20-25
• 全文大小：874 K

文摘

A series of novel coumarin based chalcones were synthesized by the classical crossed aldol condensation reaction of 8-acetyl-1,4-diethyl-1,2,3,4-tetrahydro-7H-pyrano[2,3-g]quinoxalin-7-one and various substituted benzaldehydes. These novel ketocoumarin derivatives having a 1,4-diethyl-1,2,3,4-tetrahydroquinoxaline framework exhibited brilliant fluorescence. The novel chalcones absorbed in the range of 458–523 nm in various solvents. The wavelength of maximum absorption of these chalcones was found to be significantly longer than their simple acyl derivative known in the literature. The dyes displayed longer wavelength of absorption in the high polarity solvents compared to non-polar solvents. Thermogravimetric analysis of the chalcones revealed that the chalcones possess good thermal stability.