Synthesis and characterization of new rhodamine dyes with large Stokes shift

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• 作者：Zhidan Tian ; Baozhu Tian ; Jinlong Zhang
• 关键词：Rhodamine ; 1 ; 4-Diethyl-1 ; 2 ; 3 ; 4-tetrahydroquinoxaline ; Fluorescence ; Stokes shift ; Synthesis ; Intramolecular charge transfer
• 刊名：Dyes and Pigments
• 出版年：December, 2013
• 年：2013
• 卷：99
• 期：3
• 页码：1132-1136
• 全文大小：1070 K

文摘

Two new rhodamine dyes (Rh Q-H, Rh Q-Me) containing 1, 4-diethyl-1, 2, 3, 4-tetrahydroquinoxaline as an effective electron donor are designed and synthesized. The structures of the novel compounds are聽confirmed by ¹H NMR, ¹³C NMR and ESI. Due to an excited-state intramolecular charge transfer (ICT),聽the new dyes exhibit longer absorption (>580聽nm) and emission (>640聽nm) compared with the model compounds, rhodamine 101 and rhodamine 6G. The new rhodamine dyes show large Stokes shift of 40-50聽nm in commonly used solvents. Notably, when measured in a mixture of H₂O/EtOH solution, significant stokes shift of 65-68聽nm are achieved, which is among the largest Stokes shifts ever reported for rhodamine dyes.