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

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Abstract

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 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.

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Authors and Affiliations

  1. State Key Laboratory for Organic Electronics & Information Displays (KLOEID); Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, 210046, China

    WenJuan Xu, ShuJuan Liu, Qiang Zhao, TingChun Ma, Shi Sun, XinYan Zhao & Wei Huang

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  1. WenJuan Xu
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  2. ShuJuan Liu
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  3. Qiang Zhao
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  6. XinYan Zhao
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  7. Wei Huang
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Correspondence to Qiang Zhao or Wei Huang.

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Xu, W., Liu, S., Zhao, Q. et al. A near-infrared phosphorescent probe for F− based on a cationic iridium(III) complex with triarylboron moieties. Sci. China Chem. 54, 1750–1758 (2011). https://doi.org/10.1007/s11426-011-4359-y

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