NDLI: Synthesis, One- and Two-Photon Photophysical and Excited-State Properties, and Sensing Application of a New Phosphorescent Dinuclear Cationic Iridium(III) Complex

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Synthesis, One- and Two-Photon Photophysical and Excited-State Properties, and Sensing Application of a New Phosphorescent Dinuclear Cationic Iridium(III) Complex

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Synthesis, One- and Two-Photon Photophysical and Excited-State Properties, and Sensing Application of a New Phosphorescent Dinuclear Cationic Iridium(III) Complex

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yu, Xiao-qiang Liu, Shu-juan Zhao, Qiang Zhao, Ning Xu, Wen-juan Zhao, Xin Huang, Wei Xu, Hang Liu, Zhi-qiang Liang, Hua
Description	Author Affiliation: Xu WJ ( Key Laboratory for Organic Electronics and Information, Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, PR China.)
Abstract	A new phosphorescent dinuclear cationic iridium(III) complex (Ir1) with a donor–acceptor–π-bridge–acceptor–donor (DAπAD)-conjugated oligomer (L1) as a N^N ligand and a triarylboron compound as a C^N ligand has been synthesized. The photophysical and excited-state properties of Ir1 and L1 were investigated by UV/Vis absorption spectroscopy, photoluminescence spectroscopy, and molecular-orbital calculations, and they were compared with those of the mononuclear iridium(III) complex $[Ir(Bpq)_{2}(bpy)]^{+}PF_{6}^{−}$ (Ir0). Compared with Ir0, complex Ir1 shows a more-intense optical-absorption capability, especially in the visible-light region. For example, complex Ir1 shows an intense absorption band that is centered at λ=448 nm with a molar extinction coefficient (ε) of about $10^{4},$ which is rarely observed for iridium(III) complexes. Complex Ir1 displays highly efficient orange–red phosphorescent emission with an emission wavelength of 606 nm and a quantum efficiency of 0.13 at room temperature. We also investigated the two-photon-absorption properties of complexes Ir0, Ir1, and L1. The free ligand (L1) has a relatively small two-photon absorption cross-section $(δ_{max}=195 GM),$ but, when complexed with iridium(III) to afford dinuclear complex Ir1, it exhibits a higher two-photon-absorption cross-section than ligand L1 in the near-infrared region and an intense two-photon-excited phosphorescent emission. The maximum two-photon-absorption cross-section of Ir1 is 481 GM, which is also significantly larger than that of Ir0. In addition, because the strong BF interaction between the dimesitylboryl groups and $F^{−}$ ions interrupts the extended π-conjugation, complex Ir1 can be used as an excellent one- and two-photon-excited “ON–OFF” phosphorescent probe for $F^{−}$ ions.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	2
Volume Number	19
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2013-01-07
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Iridium Chemistry Luminescent Agents Chemical Synthesis Organometallic Compounds Photons Absorption Chemistry Techniques, Synthetic Fluorine Models, Molecular Molecular Conformation Optical Phenomena Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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