Study on the Substituent Effects on the Spectroscopic Analysis of 3-Benzothiazoylcoumarins

• Main Authors: Chen, Chien-Chih, 陳建智
• Other Authors: Lin, Shaw-Tao
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/42408984360982631522

碩士 === 靜宜大學 === 應用化學系 === 103 === 3-Benzothiazolylcoumarins possess good luminescence properties, such as coumarin 6 (7-diethylamino-3-benzothiazolylcoumarin) is a commercial laser dye been used in the Organic Light-Emitting Diode. We prepared a series of 3-benzothiazolylcoumarins by condensation of 2-hydroxybenzaldehyde and 2-cyanomethylbenzothiazole via a base- catalytic cyclization for study the substituent effects on the spectroscopic analysis. All of the new compounds have been confirmed by MS and NMR analysis. The UV/Vis and fluorescence spectroscopic analysis reveal that the substituents at C-7 and C-6’ of 3-benzothiazolylcoumarins has the greatest influence. The presence of a methoxy group and a nitro group substituents at the titled compound demonstrated a bathochromic shift of 154 nm when they located at C-7 and C-6’, respectively. However its fluorescence is too weak to be measured because of the nitro group has an electron- withdrawing effect.