Versatile Room‐Temperature‐Phosphorescent Materials Prepared from N‐Substituted Naphthalimides: Emission Enhancement and Chemical Conjugation. Issue 34 (7th July 2016)

• Record Type: Journal Article
• Authors: Chen, Xiaofeng; Xu, Cheng; Wang, Tao; Zhou, Cao; Du, Jiajun; Wang, Zhongping; Xu, Hangxun; Xie, Tongqing; Bi, Guoqiang; Jiang, Jun; Zhang, Xuepeng; Demas, James N.; Trindle, Carl O.; Luo, Yi; Zhang, Guoqing
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 34(2016)
• Page Start: 9872
• Page End: 9876
• Publication Date: 2016-07-07
• Subjects: charge transfer -- fluorescence -- naphthalimides -- organic dyes -- phosphorescence; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201601252
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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 ( 3 π‐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 1 π‐π* and 3 π‐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. Abstract : Purely organic : N‐Substituted naphthalimides (NNIs) are purely organic materials that may show room‐temperature phosphorescence (RTP). The relatively large energy gap between the NNI‐localized 1 π‐π* and 3 π‐π* states can be bridged by intramolecular charge transfer (CT) states when the NNI is chemically modified with an electron donor.