A near-infrared phosphorescent probe for F^- based on a cationic iridium(Ⅲ) complex with triarylboron moieties  

作　　者：XU WenJuan LIU ShuJuan ZHAO Qiang MA TingChun SUN Shi ZHAO XinYan HUANG Wei 

机构地区：[1]State Key Laboratory for Organic Electronics&Information Displays(KLOEID),Institute of Advanced Materials(IAM),Nanjing University of Posts and Telecommunications,Nanjing 210046,China

出　　处：《Science China Chemistry》2011年第11期1750-1758,共9页中国科学(化学英文版)

基　　金：financially supported by the National Basic Research Program of China (973 Program, 2009CB930601);National Natural Science Foundation of China (50803028, 20804019 and 61006007);Natural Science Foundation of Jiangsu Province of China (BK2009427);Natural Science Fund for Universities in Jiangsu (10KJB430010);Scien-tific and Technological Activities for Returned Scholars in Nanjing City (NJ209001);Nanjing University of Posts and Telecommunications (NY208045)

摘　　要：In this work, a near-infrared (NIR) phosphorescent probe for F- based on a cationic Ir(III) complex [Ir(Bpq)2(quqo)]PF6 (1) with dimesitylboryl (Mes2B) groups on the cyclometalated CAN ligands (Bpq) and 2-(quinolin-2-yl)quinoxaline (quqo) as NAN ligand was designed and synthesized. The excited state properties of 1 were investigated in detail using molecular orbital calculations and experimental methods. Upon excitation, complex 1 shows NIR phosphorescent emission around 680 nm. Interestingly, the complex can be excited with long wavelength around 610 nm. Such long-wavelength excitation can reduce the background emission interference and improve the signal-to-noise ratio. Furthermore, the selective binding between boron atom and F- can give rise to the quenching of emission and realize the near-infrared phosphorescent sensing for F-. We wish that the results reported herein will be helpful for the further design of excellent near-infrared phosphorescent probes based on heavy-metal complexes.In this work, a near-infrared (NIR) phosphorescent probe for F- based on a cationic Ir(Ⅲ) complex [Ir(Bpq)2(quqo)]PF6 (1) with dimesitylboryl (Mes2B) groups on the cyclometalated C^N ligands (Bpq) and 2-(quinolin-2-yl)quinoxaline (quqo) as N^N ligand was designed and synthesized. The excited state properties of 1 were investigated in detail using molecular orbital cal- culations and experimental methods. Upon excitation, complex 1 shows NIR phosphorescent emission around 680 nm. Inter- estingly, the complex can be excited with long wavelength around 610 nm. Such long-wavelength excitation can reduce the background emission interference and improve the signal-to-noise ratio. Furthermore, the selective binding between boron at- om and F- can give rise to the quenching of emission and realize the near-infrared phosphorescent sensing for F-. We wish that the results reported herein will be helpful for the further design of excellent near-infrared phosphorescent probes based on heavy-metal complexes.

关 键 词：F- sensor iridium(III) complex NIR-infrared PHOSPHORESCENT triarylboron 

分 类 号：O621.2[理学—有机化学]