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Li H, Liu S, Lystrom L, Kilina S, Sun W. Improving triplet excited-state absorption and lifetime of cationic iridium(III) complexes by extending π-conjugation of the 2-(2-quinolinyl)quinoxaline ligand. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112609] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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2
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Zhu S, Hu L, Gu L, Liu R, Zhu H. Heteroleptic Ir(iii) complexes with varied π-conjugated diimine ligands: synthesis, tunable triplet states and nonlinear absorption properties. Dalton Trans 2020; 49:7945-7951. [PMID: 32495779 DOI: 10.1039/d0dt01207f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Four heteroleptic Ir(iii) complexes (Ir-1-Ir-4) with varied π-conjugated diimine ligands were synthesized. Their optical properties were investigated systematically via spectroscopic methods, in order to elucidate the influence of the extended π-conjugation on the singlet and triplet states of the molecules. All these Ir(iii) complexes exhibit ligand localized 1π,π* transitions below 370 nm, and broad metal-to-ligand and ligand-to-ligand charge transfer (MLCT/LLCT) absorption bands in the visible region. Extending the π-conjugation in diimine ligands influences the electron distribution of the triplet state. The 3π,π* dominated Ir(iii) complexes (Ir-3 and Ir-4) exhibit long-lived triplet states and low phosphorescence quantum yields, compared with the charge transfer dominated Ir(iii) complexes (Ir-1 and Ir-2). Complexes Ir-3 and Ir-4 exhibit broadband transient absorption spectra from 420 to 750 nm, between which the nonlinear absorption could be observed by virtue of reverse saturable absorption. The results of nonlinear transmission measurements using 532 nm laser pulses further elucidate that selected complexes Ir-3 and Ir-4 are promising candidates for optical limiting applications.
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Affiliation(s)
- Senqiang Zhu
- School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China.
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Liu B, Jabed MA, Kilina S, Sun W. Synthesis, Photophysics, and Reverse Saturable Absorption of trans-Bis-cyclometalated Iridium(III) Complexes (C^N^C)Ir(R-tpy) + (tpy = 2,2':6',2″-Terpyridine) with Broadband Excited-State Absorption. Inorg Chem 2020; 59:8532-8542. [PMID: 32497429 DOI: 10.1021/acs.inorgchem.0c00961] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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.
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Affiliation(s)
- Bingqing Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota58108-6050, United States
| | - Mohammed A Jabed
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota58108-6050, United States
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota58108-6050, United States
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota58108-6050, United States
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Ma XF, Luo XF, Yan ZP, Wu ZG, Zhao Y, Zheng YX, Zuo JL. Syntheses, Crystal Structures, and Photoluminescence of a Series of Iridium(III) Complexes Containing the Pentafluorosulfanyl Group. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00392] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao-Feng Ma
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Xu-Feng Luo
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Zhi-Ping Yan
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Zheng-Guang Wu
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Yue Zhao
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - You-Xuan Zheng
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
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Liu B, Lystrom L, Cameron CG, Kilina S, McFarland SA, Sun W. Monocationic Iridium(III) Complexes with Far‐Red Charge‐Transfer Absorption and Near‐IR Emission: Synthesis, Photophysics, and Reverse Saturable Absorption. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900156] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Bingqing Liu
- Department of Chemistry and Biochemistry North Dakota State University Fargo North Dakota 58108‐6050 USA
| | - Levi Lystrom
- Department of Chemistry and Biochemistry North Dakota State University Fargo North Dakota 58108‐6050 USA
| | - Colin G. Cameron
- Department of Chemistry and Biochemistry University of North Carolina at Greensboro Greensboro North Carolina 27402‐6170 USA
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry North Dakota State University Fargo North Dakota 58108‐6050 USA
| | - Sherri A. McFarland
- Department of Chemistry and Biochemistry University of North Carolina at Greensboro Greensboro North Carolina 27402‐6170 USA
| | - Wenfang Sun
- Department of Chemistry and Biochemistry North Dakota State University Fargo North Dakota 58108‐6050 USA
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Tang M, Zhu S, Liu R, Wang J, Zhang Z, Zhu H. Synthesis, characterization and optical properties of novel Ir(III) complexes bearing N-heterocycle substituents. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.11.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Liu R, Zhu S, Shi H, Hu J, Shu M, Liu J, Zhu H. Synthesis, structural characterization, opto-electrical properties of Ir(III) complexes with imidazolium-based carbene ligands. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.10.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Dragonetti C, Colombo A, Fontani M, Marinotto D, Nisic F, Righetto S, Roberto D, Tintori F, Fantacci S. Novel Fullerene Platinum Alkynyl Complexes with High Second-Order Nonlinear Optical Properties as a Springboard for NLO-Active Polymer Films. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00094] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Claudia Dragonetti
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
- ISTM-CNR, Via Golgi
19, I-20133 Milano, Italy
| | - Alessia Colombo
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Mattia Fontani
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
| | | | - Filippo Nisic
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Stefania Righetto
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Dominique Roberto
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
- ISTM-CNR, Via Golgi
19, I-20133 Milano, Italy
| | - Francesco Tintori
- Dipartimento
di Chimica and Centro SmartMatLab dell’Università degli
Studi di Milano, UdR INSTM di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Simona Fantacci
- Computational
Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di
Sotto 8, I-06213 Perugia, Italy
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Lu T, Wang C, Lystrom L, Pei C, Kilina S, Sun W. Effects of extending the π-conjugation of the acetylide ligand on the photophysics and reverse saturable absorption of Pt(ii) bipyridine bisacetylide complexes. Phys Chem Chem Phys 2016; 18:28674-28687. [DOI: 10.1039/c6cp02628a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Extending the acetylide ligand π-conjugation diminishes the terminal substituent effect on the lowest excited states, but expands the triplet excited-state absorption to the near-IR region.
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Affiliation(s)
- Taotao Lu
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Chengzhe Wang
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Levi Lystrom
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Chengkui Pei
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
| | - Wenfang Sun
- Department of Chemistry and Biochemistry
- North Dakota State University
- Fargo
- USA
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