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Silva RC, Canisares FSM, Saraiva LF, Pires AM, Lima SAM. Featuring long-lifetime deep-red emitting iridium III complexes with high colour purity: insights into the excited state dynamics from spectroscopic and theoretical perspectives. Dalton Trans 2024; 53:5466-5477. [PMID: 38414337 DOI: 10.1039/d3dt02531d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The significant attention drawn to IrIII-complexes in recent years has boosted the development of new compounds with advantageous photophysical features. However, obtaining IrIII deep-red-emitting complexes with long lived excited state, high colour purity and high quantum yield (Φ) remains a challenging task. To address this issue, this study reports the synthesis and photophysical investigation of three novel zwitterionic complexes, [Ir(C^N)2bqdc] (C^N = ppy, phq, and bzq), with ppy = 2-phenylpyridine (Ir-pb), phq = 2-phenylquinoline (Ir-qb), bzq = benzo[h]quinoline (Ir-bb), and bqdc = potassium 2,2'-biquinoline-4,4'-dicarboxylate. These complexes exhibit high quantum yields and long emission lifetimes with high colour purity in the deep-red region. The structural characterisation carried out by usual spectroscopic measurements supports the proposed structures, while the photophysical study unveiled the high contribution of the 3MLCT state to the hybrid emitter state, as endorsed by theoretical investigations. The desired correspondence between the calculations and the experimental data set affirmed the accuracy of the theoretical analysis, which enabled us to establish a relationship between the ground-to-excited-state geometry distortion and the lifetime through the nonradiative decay (knr). Furthermore, these newly synthesized complexes exhibit quenching in the presence of molecular oxygen. In deoxygenated DMSO solution the knr values halve, increasing the quantum yields (34.0, 10.6, and 26.6%) and the lifetimes (1.13, 1.11, and 1.72 μs), while leading to quite pure deep-red emission - CIE coordinates: (0.67, 0.33), (0.60, 0.40;), (0.65, 0.35) for Ir-pb, Ir-qb, and Ir-bb, respectively. These complexes display considerable potential for a wide range of applications, such as photodynamic therapy, due to their attractive photophysical properties, and are among the deep-red-emitting complexes reported in the literature with longer lifetimes and higher Φ.
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Affiliation(s)
- Renan C Silva
- São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, SP, Brazil.
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences, São José do Rio Preto, SP, Brazil
| | - Felipe S M Canisares
- São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, SP, Brazil.
- São Paulo State University (Unesp), Institute of Chemistry, Araraquara, SP, Brazil
| | - Leonardo F Saraiva
- São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, SP, Brazil.
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences, São José do Rio Preto, SP, Brazil
| | - Ana M Pires
- São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, SP, Brazil.
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences, São José do Rio Preto, SP, Brazil
- São Paulo State University (Unesp), Institute of Chemistry, Araraquara, SP, Brazil
| | - Sergio A M Lima
- São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, SP, Brazil.
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences, São José do Rio Preto, SP, Brazil
- São Paulo State University (Unesp), Institute of Chemistry, Araraquara, SP, Brazil
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Nguyen TLA, Dao DQ. From green to near-infrared emission of cyclometalated Iridium (III) complexes modified with flavonoids: a theoretical insight. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2026509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Thi Le Anh Nguyen
- Institute of Research and Development, Duy Tan University, Danang, Vietnam
- Faculty of Natural Sciences, Duy Tan University, Danang, Vietnam
| | - Duy Quang Dao
- Institute of Research and Development, Duy Tan University, Danang, Vietnam
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Barroso R, Cabal MP, Jiménez A, Valdés C. Cascade and multicomponent synthesis of structurally diverse 2-(pyrazol-3-yl)pyridines and polysubstituted pyrazoles. Org Biomol Chem 2020; 18:1629-1636. [PMID: 32037410 DOI: 10.1039/c9ob02691f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The cascade reaction between N-tosylhydrazones and 2-alkynylpyridines leads to 2-(pyrazol-3-yl)pyridines, important structural motifs in ligands for transition metals and bioactive molecules. When the reaction is conducted with 2,6-diethynylpyridine, the important 2,6-bis(pyrazolyl)pyridines are obtained, featuring the arrangement of tridentate and also pentadentate ligands. A novel three-component version of the reaction has been designed, which involves the use of α-bromo-N-tosylhydrazones, alkynylpyridines and NH-azoles. The generality of the multicomponent reaction is further illustrated by the preparation of different polysubstituted pyrazoles by employing an array of terminal alkynes. In these multicomponent reactions, complex molecules featuring three different heterocycles are assembled in a single step from commercial materials, enabling the fast generation of molecular diversity.
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Affiliation(s)
- Raquel Barroso
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo, c/ Julián Clavería 8, Oviedo 33006, Spain.
| | - María-Paz Cabal
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo, c/ Julián Clavería 8, Oviedo 33006, Spain.
| | - Azucena Jiménez
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo, c/ Julián Clavería 8, Oviedo 33006, Spain.
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo, c/ Julián Clavería 8, Oviedo 33006, Spain.
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Lee S, Han WS. Cyclometalated Ir(iii) complexes towards blue-emissive dopant for organic light-emitting diodes: fundamentals of photophysics and designing strategies. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00001a] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The fundamental photophysics of cyclometalated Ir(iii) complexes and surveys design strategies for efficient blue phosphorescent Ir(iii) complexes are summarised.
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Affiliation(s)
- Sunhee Lee
- Department of Chemistry
- Seoul Women's University
- Seoul 01797
- Republic of Korea
| | - Won-Sik Han
- Department of Chemistry
- Seoul Women's University
- Seoul 01797
- Republic of Korea
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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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