Versatile Room-Temperature-Phosphorescent Materials Prepared from N-Substituted Naphthalimides: Emission Enhancement and Chemical Conjugation

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• 作者：Xiaofeng Chen ; Dr. Cheng Xu ; Tao Wang ; Cao Zhou ; Jiajun Du ; Prof. Zhongping Wang ; Prof. Hangxun Xu ; Tongqing Xie ; Prof. Guoqiang Bi ; Prof. Jun Jiang ; Dr. Xuepeng Zhang ; Prof. James N. Demas ; Prof. Carl O. Trindle ; Prof. Yi Luo and Prof. Guoqing Zhang
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 16, 2016
• 年：2016
• 卷：55
• 期：34
• 页码：9872-9876
• 全文大小：3764K
• ISSN：1521-3773

文摘

Purely organic materials with room-temperature phosphorescence (RTP) are currently under intense investigation because of their potential applications in sensing, imaging, and displaying. Inspired by certain organometallic systems, where ligand-localized phosphorescence (³π-π*) is mediated by ligand-to-metal or metal-to-ligand charge transfer (CT) states, we now show that donor-to-acceptor CT states from the same organic molecule can also mediate π-localized RTP. In the model system of N-substituted naphthalimides (NNIs), the relatively large energy gap between the NNI-localized ¹π-π* and ³π-π* states of the aromatic ring can be bridged by intramolecular CT states when the NNI is chemically modified with an electron donor. These NNI-based RTP materials can be easily conjugated to both synthetic and natural macromolecules, which can be used for RTP microscopy.