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

来源：Science China Chemistry, 2011, 54(11): 1750-1758.

DOI：10.1007/s11426-011-4359-y

• F(-) sensor
• iridium(III) complex
• NIR-infrared
• phosphorescent
• triarylboron

In this work, a near-infrared (NIR) phosphorescent probe for F(-) based on a cationic Ir(III) complex [Ir(Bpq)(2)(quqo)]PF(6) (1) with dimesitylboryl (Mes2B) groups on the cyclometalated Ca N ligands (Bpq) and 2-(quinolin-2-yl)quinoxaline (quqo) as Na N 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.

• 出版日期2011-11
• 单位南京邮电大学