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• W3033520646 endingPage "8542" @default.
• W3033520646 startingPage "8532" @default.
• W3033520646 abstract "Extending the bandwidth of triplet excited-state absorption in transition-metal complexes is appealing for developing broadband reverse saturable absorbers. Targeting this goal, five bis-terdentate iridium(III) complexes (Ir1-Ir5) bearing trans-bis-cyclometalating (C^N^C) and 4′-R-2,2′:6′,2″-terpyridine (4′-R-tpy) ligands were synthesized. The effects of the structural variation in cyclometalating ligands and substituents at the tpy ligand on the photophysics of these complexes have been systematically explored using spectroscopic methods (i.e., UV–vis absorption, emission, and transient absorption spectroscopy) and time-dependent density functional theory (TDDFT) calculations. All complexes exhibited intensely structured 1π,π* absorption bands at <400 nm and broad charge transfer (1CT)/1π,π* transitions at 400–600 nm. Ligand structural variations exerted a very small effect on the energies of the 1CT/1π,π* transitions; however, they had a significant effect on the molar extinction coefficients of these absorption bands. All complexes emitted featureless deep red phosphorescence in solutions at room temperature and gave broad-band and strong triplet excited-state absorption ranging from the visible to the near-infrared (NIR) spectral regions, with both originating from the 3π,π*/3CT states. Although alteration of the ligand structures influenced the emission energies slightly, these changes significantly affected the emission lifetimes and quantum yields, transient absorption spectral features, and the triplet excited-state quantum yields of the complexes. Except for Ir3, the other four complexes all manifested reverse saturable absorption (RSA) upon nanosecond laser pulse excitation at 532 nm, with the decreasing trend of RSA following Ir2 ≈ Ir4 > Ir1 > Ir5 > Ir3. The RSA trend corresponded well with the strength of the excited-state and ground-state absorption differences (ΔOD) at 532 nm for these complexes." @default.
• W3033520646 created "2020-06-12" @default.
• W3033520646 creator A5033717610 @default.
• W3033520646 creator A5071822893 @default.
• W3033520646 creator A5087381063 @default.
• W3033520646 creator A5087398030 @default.
• W3033520646 date "2020-06-04" @default.
• W3033520646 modified "2023-10-17" @default.
• W3033520646 title "Synthesis, Photophysics, and Reverse Saturable Absorption of <i>trans</i>-Bis-cyclometalated Iridium(III) Complexes (C^N^C)Ir(R-tpy)⁺ (tpy = 2,2′:6′,2″-Terpyridine) with Broadband Excited-State Absorption" @default.
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• W3033520646 doi "https://doi.org/10.1021/acs.inorgchem.0c00961" @default.
• W3033520646 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32497429" @default.
• W3033520646 hasPublicationYear "2020" @default.
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