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Esteruelas MA, Moreno-Blázquez S, Oliván M, Oñate E. N,C,N-Pincers in Platinum Bimetallic Complexes: Influence of the Pincer and Bridging Ligands on the Metal-Metal Bond and the Photophysical Properties. Inorg Chem 2024; 63:14482-14494. [PMID: 39028899 DOI: 10.1021/acs.inorgchem.4c01712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/21/2024]
Abstract
Precursors PtCl{κ3-N,C,N-[py-C6HMe2-py]} (1), PtCl{κ3-N,C,N-[py-O-C6H3-O-py]} (2), Pt(OH){κ3-N,C,N-[py-C6HMe2-py]} (3), and Pt(OH){κ3-N,C,N-[py-O-C6H3-O-py]} (4) were used to prepare d8-platinum bimetallic complexes. Precursors 1 and 2 react with AgBF4 and 7-azaindole (Haz) to give [Pt{κ3-N,C,N-[py-C6HMe2-py]}{κ1-N-[Haz]}]BF4 (5) and [Pt{κ3-N,C,N-[py-O-C6H3-O-py]}{κ1-N-[Haz]}]BF4 (6) and 3 and 4 with indolo[2,3-b]indole (H2ii) to generate Pt{κ1-N-[Hii]}{κ3-N,C,N-[py-C6HMe2-py]} (7) and Pt{κ1-N-[Hii]}{κ3-N,C,N-[py-O-C6H3-O-py]} (8). Subsequent addition of 3 and 4 to 5-7 affords bimetallic derivatives [{Pt[κ3-N,C,N-(py-C6HMe2-py)]}2{μ-N,N-[az]}]BF4 (9), [{Pt[κ3-N,C,N-(py-O-C6H3-O-py)]}2{μ-N,N-[az]}]BF4 (10), and {Pt[κ3-N,C,N-(py-C6HMe2-py)]}2{μ-N,N-[ii]} (11). X-ray structures of 9-11 reveal separations between the metals in sequence 9 (3.0515(4) Å) < 10 (3.2689(9) Å) < 11 (3.2949(2) Å). DFT calculations support σ overlap of the dz2 orbitals of platinum atoms, for 9 and 10. Accordingly, their absorption spectra show a MMLCT transition. Complex 9 is a red emitter. The excited state has 3MMLCT characteristics and a Pt-Pt separation of 2.763 Å. Complex 11 is a dual emitter in the red and NIR regions, in solid. Both excited states have a 3LC/LMCT characteristic and platinum-platinum separations of 3.290 and 3.202 Å. Intermediate 5 is a green emitter that achieves quantum yields close to unity, when diluted in PMMA and 1,2-dichloroethane at low concentrations.
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Affiliation(s)
- Miguel A Esteruelas
- Departamento de Química Inorgánica - Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) - Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Zaragoza - CSIC, Zaragoza 50009, Spain
| | - Sonia Moreno-Blázquez
- Departamento de Química Inorgánica - Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) - Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Zaragoza - CSIC, Zaragoza 50009, Spain
| | - Montserrat Oliván
- Departamento de Química Inorgánica - Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) - Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Zaragoza - CSIC, Zaragoza 50009, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica - Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) - Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Zaragoza - CSIC, Zaragoza 50009, Spain
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2
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Abramov VM, Tokhtueva MD, Melekhin VV, Eltsov OS. Acetonyl C^N^N platinum(II) complexes of arylbipyridines. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2024. [PMID: 38982634 DOI: 10.1002/mrc.5475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 06/21/2024] [Accepted: 06/25/2024] [Indexed: 07/11/2024]
Abstract
This paper presents the first example of the formation of acetonyl tridentate CˆNˆN complexes of arylbipyridines in the reaction of chloroplatinum complexes with acetone in the presence of alkali. The chemical structure of obtained substances was established by means of 1H,13C NMR, COSY, HSQC, and HMBC techniques. The attribution of all proton and carbon signals in NMR spectra was performed using 1D and 2D NMR experiments for the synthesized acetonyl cycloplatinated complexes. A comparative analysis of the values of the C-Pt spin-spin coupling constants of the same order was carried out, which showed a significant difference in bond lengths and valence angles inthe cyclic fragments of the arylbipyridine ligand.
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Affiliation(s)
- Vladislav M Abramov
- Chemical Technology Institute, Ural Federal University, Yekaterinburg, Russian Federation
| | - Maria D Tokhtueva
- Chemical Technology Institute, Ural Federal University, Yekaterinburg, Russian Federation
| | - Vsevolod V Melekhin
- Chemical Technology Institute, Ural Federal University, Yekaterinburg, Russian Federation
| | - Oleg S Eltsov
- Chemical Technology Institute, Ural Federal University, Yekaterinburg, Russian Federation
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3
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Shilov RA, Podkorytov IS, Kisel KS, Galenko EE, Karpitskaya DO, Rodionov IA, Shakirova JR, Tunik SP. DPPM-Bridged Binuclear Pt(II) Pincer Complexes: Chemistry, Structure, and Photophysics in Solution Revisited. Inorg Chem 2024; 63:11194-11208. [PMID: 38836300 DOI: 10.1021/acs.inorgchem.4c00984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
A series of luminescent binuclear ([dppm{Pt(NNC)}2]2+) and mononuclear ([PPh3Pt(NNC)]+) complexes containing pincer ligands were synthesized and characterized. Photophysical characteristics of both types of complexes were studied in dichloromethane solution. In the solid phase, the binuclear compounds adopt a syn configuration where the {Pt(NNC)} fragments are held together due to intramolecular Pt-Pt bonding and π-stacking of the pincer ligand aromatic systems. Analysis of the complexes' molecular structure in solution by multinuclear NMR spectroscopy showed that the stacked intramolecular configuration is retained in fluid media, which is in complete agreement with a considerable red shift of the emission wavelength due to formation of the intramolecular Pt-Pt bond, leading to the transformation of an emissive excited state to 3MMLCT. It was also found that triethylamine quenches the emission of both types of complexes; the mechanism of quenching is a combination of dynamic and static channels of excited-state deactivation. In the case of binuclear complexes, deprotonation of the dppm methylene bridge by triethylamine also contributes to the chromophore quenching. To explain the observed chemistry of binuclear complex interactions with Et3N, a chemical equilibrium scheme was suggested, which was confirmed by quantitative monitoring of the 31P signal variations as a function of triethylamine concentration.
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Affiliation(s)
- Roman A Shilov
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
| | - Ivan S Podkorytov
- Biomolecular NMR Laboratory, St. Petersburg State University, 7-9 Universitetskaya Emb., 199034 Saint Petersburg, Russia
| | - Kristina S Kisel
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
| | - Ekaterina E Galenko
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
| | - Daria O Karpitskaya
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
| | - Ivan A Rodionov
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
| | - Julia R Shakirova
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
| | - Sergey P Tunik
- Institute of Chemistry, St. Petersburg State University, Universitetskii av., 26, 198504 Saint Petersburg, Russia
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4
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Poveda D, Vivancos Á, Bautista D, González-Herrero P. Luminescent Platinum(II) Complexes with Terdentate N∧C∧C Ligands. Inorg Chem 2023; 62:20987-21002. [PMID: 38051299 PMCID: PMC10751801 DOI: 10.1021/acs.inorgchem.3c02399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 11/17/2023] [Accepted: 11/22/2023] [Indexed: 12/07/2023]
Abstract
The synthesis, structure, and luminescence of Pt(II) complexes of the type [Pt(N∧C∧C)(L)] are reported, where N∧C∧C is a terdentate ligand resulting from the cycloplatination of 2-(3,5-diphenoxyphenyl)pyridine or 2-(4,4″-dimethyl-[1,1':3',1″-terphenyl]-5'-yl)pyridine, and L represents a monodentate ancillary ligand, which can be γ-picoline, 4-pyridinecarboxaldehyde, PPh3, n-butyl or 2,6-dimethylphenyl isocyanide, CO, or the N-heterocyclic carbenes 1-butyl-3-methylimidazol-2-ylidene or 4-butyl-3-methyl-1-phenyl-1H-1,2,3-triazol-5-ylidene. Derivatives bearing CO, isocyanides, or carbenes showed the highest stabilities in solution, whereas the pyridine and PPh3 derivatives establish ligand-exchange equilibria in acetonitrile. Different supramolecular structures are observed in the solid state, which largely depend on the nature of the ancillary ligand. Isocyanides and CO favor π interactions between the aromatic rings, metallophilic Pt···Pt contacts, or a combination of both. In contrast, pyridine ligands may lead to bimolecular assemblies driven by C-H···O, C-H···Pt, or C-H/π hydrogen bonds. Luminescence was examined in fluid solution, poly(methyl methacrylate) matrices, and the solid state at 298 K, and in 2-methyltetrahydrofuran glasses at 77 K. The majority of derivatives show highly efficient emissions from 3ILCT/MLCT or 3ILCT/MLCT/LLCT excited states of monomeric species. The formation of excimers and different types of emissive aggregates are demonstrated, which lead to red-shifted emissions of different origins and characteristics depending on the involved noncovalent interactions.
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Affiliation(s)
- Dionisio Poveda
- Departamento
de Química Inorgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 19, 30100 Murcia, Spain
| | - Ángela Vivancos
- Departamento
de Química Inorgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 19, 30100 Murcia, Spain
| | - Delia Bautista
- Área
Científica y Técnica de Investigación, Universidad de Murcia, Campus de Espinardo, 21, 30100 Murcia, Spain
| | - Pablo González-Herrero
- Departamento
de Química Inorgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 19, 30100 Murcia, Spain
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Poveda D, Vivancos Á, Bautista D, González-Herrero P. Photochemically Induced Cyclometalations at Simple Platinum(II) Precursors. Inorg Chem 2023; 62:6207-6213. [PMID: 37043617 PMCID: PMC10131227 DOI: 10.1021/acs.inorgchem.3c00688] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Photochemical cycloplatinations of 2-arylpyridines and related C∧N ligands, as well as terdentate heteroaromatic N∧N∧C, N∧C∧N, and N∧C∧C compounds, are demonstrated using (Bu4N)2[Pt2Cl6] or [PtCl2(NCPh)2] as precursors at room temperature. Mono- or bis-cyclometalated Pt(II) complexes with C∧N ligands are obtained depending on excitation wavelength and precursor. Monitoring experiments show that photoexcitation enables both the N-coordination and the subsequent C-H metalation. Photochemical synthetic protocols have been developed, which are advantageous with respect to the established thermal procedures and have allowed the synthesis of the first Pt(II) complexes with N∧C∧C ligands.
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Affiliation(s)
- Dionisio Poveda
- Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 19, 30100 Murcia, Spain
| | - Ángela Vivancos
- Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 19, 30100 Murcia, Spain
| | - Delia Bautista
- Área Científica y Técnica de Investigación, Universidad de Murcia, Campus de Espinardo, 21, 30100 Murcia, Spain
| | - Pablo González-Herrero
- Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 19, 30100 Murcia, Spain
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6
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Tanase T, Nakamae K, Ura Y, Nakajima T. Fine tunable metal assemblies constrained by multidentate phosphine ligands. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214581] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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7
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McCarthy JS, McCormick MJ, Zimmerman JH, Hambrick HR, Thomas WM, McMillen CD, Wagenknecht PS. Role of the Trifluoropropynyl Ligand in Blue-Shifting Charge-Transfer States in Emissive Pt Diimine Complexes and an Investigation into the PMMA-Imposed Rigidoluminescence and Rigidochromism. Inorg Chem 2022; 61:11366-11376. [PMID: 35820113 DOI: 10.1021/acs.inorgchem.2c01564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Square-planar PtII complexes are of interest as dopants for the emissive layer of organic light-emitting diodes. Herein, the photophysics of three Pt bipyridyl complexes with the strongly e- withdrawing, high-field, 3,3,3-trifluoropropynyl ligand has been investigated. One complex, (phbpy)PtC2CF3 (phbpy = 6-phenyl-2,2'-dipyridyl), has also been characterized by single-crystal X-ray diffraction. All complexes reported are emissive in both RT CH2Cl2 solution (ΦPL = 0.007 to 0.027) and PMMA film (ΦPL = 0.25 to 0.42). The trifluoropropynyl ligand elevates the energy of the MLCT and LL'CT states above that of the IL π-π* state, resulting in IL emission in all cases. The emission energies of the trifluoropropynyl compounds are also blue-shifted relative to the analogous pentafluorophenylethynyl compounds, suggesting that the trifluoropropynyl ligand is one of the most electron-withdrawing alkynyl ligands. Rate constants for radiative and nonradiative deactivation were determined from experimentally determined values of ΦPL and excited-state lifetimes in both solution and PMMA films. The increase in ΦPL upon incorporation into PMMA film (rigidoluminescence) results from a decrease in the rate constant for non-radiative relaxation. Experimental activation energies for excited-state decay in combination with TDDFT are consistent with the rigidoluminescence resulting from an increase in the energy of the non-emissive triplet metal-centered state. Two of the complexes investigated, (Ph2bpy)Pt(C2CF3)2 and (t-Bu2bpy)Pt(C2CF3)2, where t-Bu2bpy = 4,4'-di-tert-butyl-2,2'-dipyridyl and Ph2bpy = 4,4'-diphenyl-2,2'-dipyridyl, exhibit concentration-dependent excimer emission (orange) along with monomer emission (blue), enabling fine-tuning of the emission color. However, excimer emission was absent in cured PMMA films up to the solubility limit for solution processing of (Ph2bpy)Pt(C2CF3)2 in CH2Cl2, demonstrating the diffusional nature of excimer formation.
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Affiliation(s)
- Jackson S McCarthy
- Department of Chemistry, Furman University, Greenville, South Carolina 29609, United States
| | - Mary Jo McCormick
- Department of Chemistry, Furman University, Greenville, South Carolina 29609, United States
| | - John H Zimmerman
- Department of Chemistry, Furman University, Greenville, South Carolina 29609, United States
| | - H Rhodes Hambrick
- Department of Chemistry, Furman University, Greenville, South Carolina 29609, United States
| | - Wilson M Thomas
- Department of Chemistry, Furman University, Greenville, South Carolina 29609, United States
| | - Colin D McMillen
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States
| | - Paul S Wagenknecht
- Department of Chemistry, Furman University, Greenville, South Carolina 29609, United States
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8
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Poh WC, Au-Yeung HL, Chan AKW, Hong EYH, Cheng YH, Leung MY, Lai SL, Low KH, Yam VWW. Cyclometalated Platinum(II) Complexes with Donor-Acceptor-Containing Bidentate Ligands and Their Application Studies as Organic Resistive Memories. Chem Asian J 2021; 16:3669-3676. [PMID: 34569719 DOI: 10.1002/asia.202100897] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/06/2021] [Indexed: 11/10/2022]
Abstract
A series of heteroleptic cyclometalated platinum(II) complexes, [Pt(C^N)(O^O)], (1-10) with various donors and acceptors has been synthesized and characterized by 1 H NMR spectroscopy, elemental analyses, infrared spectroscopy and mass spectrometry. The X-ray structure of 2 has also been determined. The electrochemical and photophysical properties of the platinum(II) complexes were studied. These experimental results have been supported by computational studies. Furthermore, two of the complexes have been employed as the active material in the fabrication of resistive memory devices, exhibiting stable binary memory performance with low operating voltage, high ON/OFF ratio and long retention time.
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Affiliation(s)
- Wei Church Poh
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Ho-Leung Au-Yeung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Alan Kwun-Wa Chan
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Eugene Yau-Hin Hong
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Yat-Hin Cheng
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Ming-Yi Leung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Shiu-Lun Lai
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Kam-Hung Low
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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9
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Platinum and palladium complexes with tetrazole ligands: Synthesis, structure and applications. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214132] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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10
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Kozina DO, Shakirova JR, Galenko EE, Porsev VV, Gurzhiy VV, Khlebnikov AF, Tunik SP. Unusual Reactivity and Photophysical Properties of Platinum(II) Pincer Complexes Containing 6,6'‐Diphenyl‐2,2'‐bipyridine Ligands. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202000827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Daria O. Kozina
- Institute of Chemistry St. Petersburg State University Universitetskii pr. 26 198504 St. Petersburg Russia
| | - Julia R. Shakirova
- Institute of Chemistry St. Petersburg State University Universitetskii pr. 26 198504 St. Petersburg Russia
| | - Ekaterina E. Galenko
- Institute of Chemistry St. Petersburg State University Universitetskii pr. 26 198504 St. Petersburg Russia
| | - Vitaly V. Porsev
- Institute of Chemistry St. Petersburg State University Universitetskii pr. 26 198504 St. Petersburg Russia
| | - Vladislav V. Gurzhiy
- Institute of Earth Sciences St. Petersburg State University University emb. 7/9 199034 St. Petersburg Russia
| | - Alexander F. Khlebnikov
- Institute of Chemistry St. Petersburg State University Universitetskii pr. 26 198504 St. Petersburg Russia
| | - Sergey P. Tunik
- Institute of Chemistry St. Petersburg State University Universitetskii pr. 26 198504 St. Petersburg Russia
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11
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Solid-state spectroscopic properties of dinuclear cyclometalated Pt(II) complexes with different bridging ligands and anions. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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12
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Munín‐Cruz P, Reigosa F, Rúa‐Sueiro M, Ortigueira JM, Pereira MT, Vila JM. Chemistry of Tetradentate [ C, N : C, N] Iminophosphorane Palladacycles: Preparation, Reactivity and Theoretical Calculations. ChemistryOpen 2020; 9:1190-1194. [PMID: 33235825 PMCID: PMC7670630 DOI: 10.1002/open.202000253] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 10/20/2020] [Indexed: 01/05/2023] Open
Abstract
A theoretical and experimental study of tetradentate [C,N : C,N] iminophosphorane palladacycles was carried out for the purpose of elucidating their behavior as compared to the parent Schiff base analogues to determine the prospect of encountering new A-frame structures for the iminophosphorane derivatives. The DFT calculations were in agreement with the experimental results regarding the performance of these ligands. New insights into the chemistry of the related dinuclear species have been obtained.
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Affiliation(s)
- Paula Munín‐Cruz
- Departamento de Química InorgánicaUniversidad de Santiago de Compostela15782Santiago de CompostelaSpain
| | - Francisco Reigosa
- Departamento de Química InorgánicaUniversidad de Santiago de Compostela15782Santiago de CompostelaSpain
| | - Marcos Rúa‐Sueiro
- Departamento de Química InorgánicaUniversidad de Santiago de Compostela15782Santiago de CompostelaSpain
| | - Juan M. Ortigueira
- Departamento de Química InorgánicaUniversidad de Santiago de Compostela15782Santiago de CompostelaSpain
| | - M. Teresa Pereira
- Departamento de Química InorgánicaUniversidad de Santiago de Compostela15782Santiago de CompostelaSpain
| | - José M. Vila
- Departamento de Química InorgánicaUniversidad de Santiago de Compostela15782Santiago de CompostelaSpain
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13
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Chen WC, Cheng YC. Elucidating the Magnitude of Internal Reorganization Energy of Molecular Excited States from the Perspective of Transition Density. J Phys Chem A 2020; 124:7644-7657. [PMID: 32864966 DOI: 10.1021/acs.jpca.0c06482] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Quantifying vibronic couplings in molecular excited states is crucial for the elucidation of a broad range of photophysical phenomena. In this study, we compare different theoretical approaches for the calculation of reorganization energy, a measure of vibronic coupling strength, and provide a rigorous derivation to show that molecular transition density characterizing electron-hole excitation could be used to quantify the magnitude of reorganization energy. The theory enables a descriptor based on molecular-orbital coefficients and atomic transition densities to quantify the magnitude of reorganization energies in molecular excited states. Applying the approach to low-lying excited states of polyacenes, we demonstrate that transition density distribution explains the difference in the magnitude of the reorganization energy of different excited states. Furthermore, to clarify the applicability of the transition density descriptor in molecular design for small-reorganization energy molecules, we investigate a broad range of molecular chromophores to show the effectiveness of the proposed theory. With this perspective on the relationship between reorganization energy and transition density, we successfully provide a quantitative rule to identify π-conjugated systems with small reorganization energy in the excited state, which should be useful for the development of novel optoelectronic materials.
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Affiliation(s)
- Wei-Chih Chen
- Department of Chemistry and Center for Quantum Science and Engineering, National Taiwan University, Taipei City 106, Taiwan, R.O.C
| | - Yuan-Chung Cheng
- Department of Chemistry and Center for Quantum Science and Engineering, National Taiwan University, Taipei City 106, Taiwan, R.O.C
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Chen X, Li Y, Chen L, Zhu Z, Li B, Huang Y, Zhang M. Synthesis of N-Biheteroarenes via Acceptorless Dehydrogenative Coupling of Benzocyclic Amines with Indole Derivatives. J Org Chem 2019; 84:3559-3565. [DOI: 10.1021/acs.joc.9b00200] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Xiuwen Chen
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Yibiao Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Lu Chen
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Zhongzhi Zhu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Bin Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Yubing Huang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Min Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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15
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Binuclear luminescent Pt(II) complexes based on substituted 3,6-diphenylpyridazines; synthesis and photophysical study. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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16
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Cebrián C, Mauro M. Recent advances in phosphorescent platinum complexes for organic light-emitting diodes. Beilstein J Org Chem 2018; 14:1459-1481. [PMID: 30013674 PMCID: PMC6037003 DOI: 10.3762/bjoc.14.124] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 05/23/2018] [Indexed: 01/30/2023] Open
Abstract
Phosphorescent organometallic compounds based on heavy transition metal complexes (TMCs) are an appealing research topic of enormous current interest. Amongst all different fields in which they found valuable application, development of emitting materials based on TMCs have become crucial for electroluminescent devices such as phosphorescent organic light-emitting diodes (PhOLEDs) and light-emitting electrochemical cells (LEECs). This interest is driven by the fact that luminescent TMCs with long-lived excited state lifetimes are able to efficiently harvest both singlet and triplet electro-generated excitons, thus opening the possibility to achieve theoretically 100% internal quantum efficiency in such devices. In the recent past, various classes of compounds have been reported, possessing a beautiful structural variety that allowed to nicely obtain efficient photo- and electroluminescence with high colour purity in the red, green and blue (RGB) portions of the visible spectrum. In addition, achievement of efficient emission beyond such range towards ultraviolet (UV) and near infrared (NIR) regions was also challenged. By employing TMCs as triplet emitters in OLEDs, remarkably high device performances were demonstrated, with square planar platinum(II) complexes bearing π-conjugated chromophoric ligands playing a key role in such respect. In this contribution, the most recent and promising trends in the field of phosphorescent platinum complexes will be reviewed and discussed. In particular, the importance of proper molecular design that underpins the successful achievement of improved photophysical features and enhanced device performances will be highlighted. Special emphasis will be devoted to those recent systems that have been employed as triplet emitters in efficient PhOLEDs.
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Affiliation(s)
| | - Matteo Mauro
- Université de Strasbourg, CNRS - Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, 23 rue du Loess, F-67000 Strasbourg, France
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Yang X, Jiao B, Dang JS, Sun Y, Wu Y, Zhou G, Wong WY. Achieving High-Performance Solution-Processed Orange OLEDs with the Phosphorescent Cyclometalated Trinuclear Pt(II) Complex. ACS APPLIED MATERIALS & INTERFACES 2018; 10:10227-10235. [PMID: 29504742 DOI: 10.1021/acsami.7b18330] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cyclometalated Pt(II) complexes can show intense phosphorescence at room temperature. Their emission properties are determined by both the organic ligand and the metal center. Whereas most of the related studies focus on tuning the properties by designing different types of organic ligands, only several reports investigate the key role played by the metal center. To address this issue, phosphorescent Pt(II) complexes with one, two, and three Pt(II) centers are designed and synthesized. With more Pt(II) centers, the cyclometalated multinuclear Pt(II) complexes display red-shifted emissions with increased photoluminescence quantum yields. Most importantly, solution-processed organic light-emitting diodes (OLEDs) with the conventional device structure using the multinuclear Pt(II) complexes as emitters show excellent performance. The controlled device based on the conventional mononuclear Pt(II) complex shows a peak external quantum efficiency, current efficiency, and power efficiency of 6.4%, 14.4 cd A-1, and 12.1 lm W-1, respectively. The efficiencies are dramatically improved to 10.5%, 21.4 cd A-1, and 12.9 lm W-1 for the OLED based on the dinuclear Pt(II) complex and to 17.0%, 35.4 cd A-1, and 27.2 lm W-1 for the OLED based on the trinuclear Pt(II) complex, respectively. To the best of our knowledge, these efficiencies are among the highest ever reported for the multinuclear Pt(II) complex-based OLEDs.
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Affiliation(s)
| | | | | | | | | | | | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology , The Hong Kong Polytechnic University , Hung Hom, Hong Kong , P. R. China
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19
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Zhang Y, Luo Q, Zheng W, Wang Z, Lin Y, Zhang E, Lü S, Xiang J, Zhao Y, Wang F. Luminescent cyclometallated platinum(ii) complexes: highly promising EGFR/DNA probes and dual-targeting anticancer agents. Inorg Chem Front 2018. [DOI: 10.1039/c7qi00346c] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Cyclometallated platinum complexes bearing 4-anilinoquinazolines exhibit high potential as luminescent probes for EGFR/DNA in living cells and dual-targeting anticancer agents.
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20
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Gao Z, Korevaar PA, Zhong R, Wu Z, Wang F. Two-component supramolecular metallogels with the presence of Pt–Pt metal–metal interactions. Chem Commun (Camb) 2018; 54:9857-9860. [DOI: 10.1039/c8cc05575k] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Two-component supramolecular metallogels have been successfully constructed with the involvement of heteromeric Pt(ii)⋯Pt(ii) metal–metal interactions, which display low-energy emissions in the near-infrared region.
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Affiliation(s)
- Zongchun Gao
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Peter A. Korevaar
- Institute for Molecules and Materials
- Radboud University
- 6525 AJ Nijmegen
- The Netherlands
| | - Ruolei Zhong
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Zehong Wu
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Feng Wang
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
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21
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Marcos I, Ojea V, Vázquez-García D, Fernández JJ, Fernández A, López-Torres M, Lado J, Vila JM. Preparation and characterization of terdentate [C,N,N] acetophenone and acetylpyridine hydrazone platinacycles: a DFT insight into the reaction mechanism. Dalton Trans 2017; 46:16845-16860. [PMID: 29171854 DOI: 10.1039/c7dt03418k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of N-ortho-chlorophenyl-substituted acetylpyridine hydrazones (a and d) with K2[PtCl4] (n-butanol/water, 100 °C) gave mononuclear complexes 1a and 1d with the ligands as [N,N] bidentate. In contrast, the reaction of N-phenyl or N-meta-chlorophenyl hydrazones (b and c, respectively) under analogous reaction conditions gave the cycloplatinated species 2b and 2c with the ligand as [C,N,N] terdentate. The treatment of the mononuclear complexes 1a and 1d with NaOAc (n-butanol, 100 °C) gave the corresponding cycloplatinated complexes 2a and 2d. Acetophenone hydrazone platinacycle 2e was prepared in a similar fashion and its reaction with tertiary mono- and triphosphines gave mono- or trinuclear species depending on the reaction conditions. The X-ray crystal structures of some of these complexes showed interesting π-π slipped stacking interactions between metallacyclic rings which, according to NCI analyses, showed an aromatic character. With an aim to rationalize the different reactivities shown by acetylpyridine hydrazones and the precise role of the acetate anion, the energy profiles for the three main steps of cycloplatination (iminoplatinum complex formation, chelation and cyclometallation) have been determined by using the DFT (M06) methods. Calculations indicate that the cycloplatination of 1b proceeds via electrophilic substitution, involving the direct replacement of the chloride anion at the Pt(ii) centre with the N-phenyl moiety as the rate-determining step, to give an agostic intermediate 5b+ that, subsequently, leads to the elimination of a proton as hydrogen chloride. When present as an "external" base, acetate enters the coordination sphere around the Pt(ii) centre and facilitates hydrazone N-H deprotonation and electrophilic C-H activation through a dissociative route, leading to a Wheland-type σ-complex intermediate 9ac.
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Affiliation(s)
- Ismael Marcos
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - Vicente Ojea
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - Digna Vázquez-García
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - Jesús J Fernández
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - Alberto Fernández
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - Margarita López-Torres
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - Jorge Lado
- Departamento de Química & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, E-15008 La Coruña, Spain.
| | - José M Vila
- Departamento de Química Inorgánica, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
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Krause M, Kourkoulos D, González-Abradelo D, Meerholz K, Strassert CA, Klein A. Luminescent PtII
Complexes of Tridentate Cyclometalating 2,5-Bis(aryl)-pyridine Ligands. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700792] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Maren Krause
- Department für Chemie; Institut für Anorganische Chemie; Universität zu Köln; Greinstraße 6 50939 Köln Germany
| | - Dimitrios Kourkoulos
- Department für Chemie; Institut für Physikalische Chemie; Universität zu Köln; Luxemburger Str. 116 50939 Köln Germany
| | - Darío González-Abradelo
- Institute of Physics and Center for Nanotechnology; Westfälische Wilhelms-Universität Münster; Heisenbergstr. 11 48149 Münster Germany
| | - Klaus Meerholz
- Department für Chemie; Institut für Physikalische Chemie; Universität zu Köln; Luxemburger Str. 116 50939 Köln Germany
| | - Cristian A. Strassert
- Institute of Physics and Center for Nanotechnology; Westfälische Wilhelms-Universität Münster; Heisenbergstr. 11 48149 Münster Germany
| | - Axel Klein
- Department für Chemie; Institut für Anorganische Chemie; Universität zu Köln; Greinstraße 6 50939 Köln Germany
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23
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Organophosphines in organoplatinum complexes: structural aspects of PtPCX2 (X = OL, NL, Cl, SL, SeL, SiL, Br or I) derivatives. TRANSIT METAL CHEM 2017. [DOI: 10.1007/s11243-017-0173-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Chan AKW, Ng M, Wong YC, Chan MY, Wong WT, Yam VWW. Synthesis and Characterization of Luminescent Cyclometalated Platinum(II) Complexes with Tunable Emissive Colors and Studies of Their Application in Organic Memories and Organic Light-Emitting Devices. J Am Chem Soc 2017; 139:10750-10761. [DOI: 10.1021/jacs.7b04952] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Alan Kwun-Wa Chan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
| | - Maggie Ng
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
| | - Yi-Chun Wong
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
| | - Mei-Yee Chan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
| | - Wing-Tak Wong
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
| | - Vivian Wing-Wah Yam
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
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25
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Chen D, Li K, Guan X, Cheng G, Yang C, Che CM. Luminescent Iridium(III) Complexes Supported by a Tetradentate Trianionic Ligand Scaffold with Mixed O, N, and C Donor Atoms: Synthesis, Structures, Photophysical Properties, and Material Applications. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00038] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Daqing Chen
- State
Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional
Materials, HKU-CAS Joint Laboratory on New Materials, and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Kai Li
- State
Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional
Materials, HKU-CAS Joint Laboratory on New Materials, and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Xiangguo Guan
- State
Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional
Materials, HKU-CAS Joint Laboratory on New Materials, and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Gang Cheng
- State
Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional
Materials, HKU-CAS Joint Laboratory on New Materials, and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Chen Yang
- State
Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional
Materials, HKU-CAS Joint Laboratory on New Materials, and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Chi-Ming Che
- State
Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional
Materials, HKU-CAS Joint Laboratory on New Materials, and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
- HKU Shenzhen Institute of Research and Innovation, Shenzhen 518053, People’s Republic of China
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26
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Hebenbrock M, Stegemann L, Kösters J, Doltsinis NL, Müller J, Strassert CA. Phosphorescent Pt(ii) complexes bearing a monoanionic C^N^N luminophore and tunable ancillary ligands. Dalton Trans 2017; 46:3160-3169. [DOI: 10.1039/c7dt00393e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A new monoanionic pincer luminophore is presented, yielding phosphorescent Pt(ii) complexes bearing a neutral 1,2,3-triazole ring introduced via click chemistry. The overall charge, intermolecular interactions and excited state properties can be manipulated and controlled.
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Affiliation(s)
- Marian Hebenbrock
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Linda Stegemann
- Physikalisches Institut and Center for Nanotechnology
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Jutta Kösters
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Nikos L. Doltsinis
- Institut für Festkörpertheorie and Center for Multiscale Theory and Computation
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Jens Müller
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Cristian A. Strassert
- Physikalisches Institut and Center for Nanotechnology
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
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27
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Solomatina AI, Aleksandrova IO, Karttunen AJ, Tunik SP, Koshevoy IO. Dibenzothiophene-platinated complexes: probing the effect of ancillary ligands on the photophysical performance. Dalton Trans 2017; 46:3895-3905. [DOI: 10.1039/c7dt00349h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Alteration of the ancillary mono- and bidentate ligands was used to influence the photoemission behaviour of a family of cyclometalated platinum complexes.
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Affiliation(s)
| | | | | | | | - Igor O. Koshevoy
- University of Eastern Finland
- Department of Chemistry
- Joensuu
- Finland
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28
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Sangari MS, Haghighi MG, Nabavizadeh SM, Kubicki M, Rashidi M. Photophysical study on unsymmetrical binuclear cycloplatinated(ii) complexes. NEW J CHEM 2017. [DOI: 10.1039/c7nj03034g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A general synthetic method has been designed to prepare a new series of unsymmetrical binuclear cyclometalated organoplatinum(ii) complexes and the effect of each part on their luminescence properties were investigated.
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Affiliation(s)
| | | | | | - Maciej Kubicki
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznan
- Poland
| | - Mehdi Rashidi
- Department of Chemistry
- College of Sciences
- Shiraz University
- Shiraz 71467-13565
- Iran
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29
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Ai Y, Li Y, Ma H, Su CY, Yam VWW. Cyclometalated Platinum(II) Complexes of 1,3-Bis(1-n-butylpyrazol-3-yl)benzenes: Synthesis, Characterization, Electrochemical, Photophysical, and Gelation Behavior Studies. Inorg Chem 2016; 55:11920-11929. [DOI: 10.1021/acs.inorgchem.6b02033] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yeye Ai
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
- Institute of Molecular Functional Materials
[Areas of Excellence Scheme, University Grants Committee (Hong Kong)]
and Department of Chemistry, The University of Hong Kong, Pokfulam
Road, Hong Kong, P. R. China
| | - Yongguang Li
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Huiqing Ma
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Cheng-Yong Su
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Vivian Wing-Wah Yam
- Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
- Institute of Molecular Functional Materials
[Areas of Excellence Scheme, University Grants Committee (Hong Kong)]
and Department of Chemistry, The University of Hong Kong, Pokfulam
Road, Hong Kong, P. R. China
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30
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Chan MHY, Wong HL, Yam VWW. Synthesis and Photochromic Studies of Dithienylethene-Containing Cyclometalated Alkynylplatinum(II) 1,3-Bis(N-alkylbenzimidazol-2′-yl)benzene Complexes. Inorg Chem 2016; 55:5570-7. [DOI: 10.1021/acs.inorgchem.6b00619] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael Ho-Yeung Chan
- Institute of Molecular Functional Materials (Areas of
Excellence Scheme, University Grants Committee (Hong Kong)) and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Hok-Lai Wong
- Institute of Molecular Functional Materials (Areas of
Excellence Scheme, University Grants Committee (Hong Kong)) and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials (Areas of
Excellence Scheme, University Grants Committee (Hong Kong)) and Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong
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31
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Synthesis, photophysical characterization and DFT studies on fluorine-free deep-blue emitting Pt(II) complexes. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2016. [DOI: 10.1515/znb-2015-0229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Herein we show that cyclometalated, square planar Pt(II) complexes can be tuned to achieve deep-blue phosphorescent emitters. For this purpose, the introduction of an electron-donating moiety on two different bidentate NˆN and NˆO fluorine-free luminophores, namely 2-(1H-tetrazol-5-yl)pyridine and picolinic acid, was carried out. The remaining two coordination sites of the Pt(II) metal center were filled by a sterically demanding cyclometallating unit, namely a tertiary phosphite CˆP ligand. This ancillary ligand avoids aggregation and provides high solubility in organic solvents. Based on this approach, we were able to blue-shift the emission of the complexes down to 411 nm, and to achieve a maximal photoluminescence quantum yield of 56% in the solid state.
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32
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Fleischmann M, Dütsch L, Elsayed Moussa M, Balázs G, Kremer W, Lescop C, Scheer M. Self-Assembly of Reactive Linear Cu3 Building Blocks for Supramolecular Coordination Chemistry and Their Reactivity toward En Ligand Complexes. Inorg Chem 2016; 55:2840-54. [DOI: 10.1021/acs.inorgchem.5b02641] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Mehdi Elsayed Moussa
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | | | | | - Christophe Lescop
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
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33
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Li K, Ming Tong GS, Wan Q, Cheng G, Tong WY, Ang WH, Kwong WL, Che CM. Highly phosphorescent platinum(ii) emitters: photophysics, materials and biological applications. Chem Sci 2016; 7:1653-1673. [PMID: 30155012 PMCID: PMC6090519 DOI: 10.1039/c5sc03766b] [Citation(s) in RCA: 331] [Impact Index Per Article: 41.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 11/27/2015] [Indexed: 01/06/2023] Open
Abstract
In recent years a blossoming interest in the synthesis, photophysics and application of phosphorescent Pt(ii) complexes, particularly on their uses in bioimaging, photocatalysis and phosphorescent organic light-emitting diodes (OLEDs), has been witnessed. The superior performance of phosphorescent Pt(ii) complexes in these applications is linked to their diverse spectroscopic and photophysical properties, which can be systematically modulated by appropriate choices of auxiliary ligands. Meanwhile, an important criterion for the practical application of phosphorescent metal complexes is their stability which is crucial for biological utilization and industrial OLED applications. Taking both the luminescence properties and stability into consideration, chelating ligands having rigid scaffolds and with strong σ-donor atoms are advantageous for the construction of highly robust phosphorescent Pt(ii) complexes. The square-planar coordination geometry endows Pt(ii) complexes with the intriguing spectroscopic and photophysical properties associated with their intermolecular interactions in both the ground and excited states. In this article, we discuss the design and synthesis of phosphorescent Pt(ii) complexes with elaboration on the effects of ligands on the structure and luminescence properties. Based on their photophysical and emission properties, we intend to shed light on the great promise of highly robust phosphorescent Pt(ii) emitters in an array of applications from molecular materials to biosensors.
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Affiliation(s)
- Kai Li
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
- HKU Shenzhen Institute of Research and Innovation , Shenzhen 518053 , China
| | - Glenna So Ming Tong
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
| | - Qingyun Wan
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
| | - Gang Cheng
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
- HKU Shenzhen Institute of Research and Innovation , Shenzhen 518053 , China
| | - Wai-Yip Tong
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
| | - Wai-Hung Ang
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
| | - Wai-Lun Kwong
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry , Institute of Molecular Functional Materials , HKU-CAS Joint Laboratory on New Materials and Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong , China .
- HKU Shenzhen Institute of Research and Innovation , Shenzhen 518053 , China
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Juliá F, González-Herrero P. Spotlight on the ligand: luminescent cyclometalated Pt(iv) complexes containing a fluorenyl moiety. Dalton Trans 2016; 45:10599-608. [DOI: 10.1039/c6dt01722c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A family of Pt(iv) complexes with 2-(9,9-dimethylfluoren-2-yl)pyridine is reported, including bis- and tris-cyclometalated derivatives, which exhibit intense 3LC phosphorescent emissions in fluid solution.
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Affiliation(s)
- Fabio Juliá
- Departamento de Química Inorgánica
- Facultad de Química
- Universidad de Murcia
- 30071 Murcia
- Spain
| | - Pablo González-Herrero
- Departamento de Química Inorgánica
- Facultad de Química
- Universidad de Murcia
- 30071 Murcia
- Spain
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35
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Phanopoulos A, Long NJ, Miller PW. Triphosphine Ligands: Coordination Chemistry and Recent Catalytic Applications. THE CHEMICAL BOND III 2016. [DOI: 10.1007/430_2015_211] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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36
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Naya L, Vázquez-García D, Fernández A, López-Torres M, Ojea V, Marcos I, Vila JM, Fernández JJ. Preparation of Imidazol-2-ylidene Carbene Palladacycles with Bi- and Tridentate Schiff Bases - Analyses of the Spectroscopic, Molecular Structure, and DFT Calculation Data. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Yoshida M, Yashiro N, Shitama H, Kobayashi A, Kato M. A Redox-Active Dinuclear Platinum Complex Exhibiting Multicolored Electrochromism and Luminescence. Chemistry 2015; 22:491-5. [DOI: 10.1002/chem.201504478] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 11/10/2022]
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38
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Huo S, Carroll J, Vezzu DAK. Design, Synthesis, and Applications of Highly Phosphorescent Cyclometalated Platinum Complexes. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500246] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shouquan Huo
- Department of Chemistry; East Carolina University; Greenville North Carolina 27858 USA
| | - Jeffrey Carroll
- Department of Chemistry; East Carolina University; Greenville North Carolina 27858 USA
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39
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Yam VWW, Au VKM, Leung SYL. Light-Emitting Self-Assembled Materials Based on d8 and d10 Transition Metal Complexes. Chem Rev 2015; 115:7589-728. [DOI: 10.1021/acs.chemrev.5b00074] [Citation(s) in RCA: 1065] [Impact Index Per Article: 118.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vivian Wing-Wah Yam
- Institute of Molecular Functional
Materials (Areas of Excellence Scheme, University Grants Committee
(Hong Kong)) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Vonika Ka-Man Au
- Institute of Molecular Functional
Materials (Areas of Excellence Scheme, University Grants Committee
(Hong Kong)) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Sammual Yu-Lut Leung
- Institute of Molecular Functional
Materials (Areas of Excellence Scheme, University Grants Committee
(Hong Kong)) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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40
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Turning-On of Coumarin Phosphorescence in Acetylacetonato Platinum Complexes of Cyclometalated Pyridyl-Substituted Coumarins. INORGANICS 2015. [DOI: 10.3390/inorganics3020055] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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41
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Henwood AF, Lesieur M, Bansal AK, Lemaur V, Beljonne D, Thompson DG, Graham D, Slawin AMZ, Samuel IDW, Cazin CSJ, Zysman-Colman E. Palladium(0) NHC complexes: a new avenue to highly efficient phosphorescence. Chem Sci 2015; 6:3248-3261. [PMID: 29142691 PMCID: PMC5657412 DOI: 10.1039/c4sc03914a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 04/02/2015] [Indexed: 11/21/2022] Open
Abstract
We report the first examples of highly luminescent di-coordinated Pd(0) complexes. Five complexes of the form [Pd(L)(L')] were synthesized, where L = IPr, SIPr or IPr* NHC ligands and L' = PCy3, or IPr and SIPr NHC ligands. The photophysical properties of these complexes were determined in degassed toluene solution and in the solid state and contrasted to the poorly luminescent reference complex [Pd(IPr)(PPh3)]. Organic light-emitting diodes were successfully fabricated but attained external quantum efficiencies of between 0.3 and 0.7%.
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Affiliation(s)
- Adam F Henwood
- Organic Semiconductor Centre , EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , UK . ; http://www.zysman-colman.com ; ; Tel: +44-(0)1334-463826
| | - Mathieu Lesieur
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , UK . ; ; Tel: +44-(0)1334-464808
| | - Ashu K Bansal
- Organic Semiconductor Centre , SUPA School of Physics and Astronomy , University of St Andrews , North Haugh , St Andrews , Fife KY16 9SS , UK .
| | - Vincent Lemaur
- Service de Chimie des Matériaux Nouveaux & Centre d'Innovation et de Recherche en Matériaux Polymères , Université de Mons - UMONS/Materia Nova , Place du Parc, 20 , B-7000 MONS , Belgium
| | - David Beljonne
- Service de Chimie des Matériaux Nouveaux & Centre d'Innovation et de Recherche en Matériaux Polymères , Université de Mons - UMONS/Materia Nova , Place du Parc, 20 , B-7000 MONS , Belgium
| | - David G Thompson
- WestCHEM Department of Pure and Applied Chemistry and Centre for Molecular Nanometrology , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK
| | - Duncan Graham
- WestCHEM Department of Pure and Applied Chemistry and Centre for Molecular Nanometrology , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK
| | - Alexandra M Z Slawin
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , UK . ; ; Tel: +44-(0)1334-464808
| | - Ifor D W Samuel
- Organic Semiconductor Centre , SUPA School of Physics and Astronomy , University of St Andrews , North Haugh , St Andrews , Fife KY16 9SS , UK .
| | - Catherine S J Cazin
- EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , UK . ; ; Tel: +44-(0)1334-464808
| | - Eli Zysman-Colman
- Organic Semiconductor Centre , EaStCHEM School of Chemistry , University of St Andrews , St Andrews , Fife KY16 9ST , UK . ; http://www.zysman-colman.com ; ; Tel: +44-(0)1334-463826
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42
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Sanning J, Ewen PR, Stegemann L, Schmidt J, Daniliuc CG, Koch T, Doltsinis NL, Wegner D, Strassert CA. Rastertunnelspektroskopisch gesteuertes Design maßgeschneiderter tiefblauer Triplettemitter. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201407439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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43
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Chow PK, Cheng G, Tong GSM, To WP, Kwong WL, Low KH, Kwok CC, Ma C, Che CM. Luminescent pincer platinum(II) complexes with emission quantum yields up to almost unity: photophysics, photoreductive C-C bond formation, and materials applications. Angew Chem Int Ed Engl 2015; 54:2084-9. [PMID: 25581564 DOI: 10.1002/anie.201408940] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Indexed: 12/21/2022]
Abstract
Luminescent pincer-type Pt(II) complexes supported by C-deprotonated π-extended tridentate RC^N^NR' ligands and pentafluorophenylacetylide ligands show emission quantum yields up to almost unity. Femtosecond time-resolved fluorescence measurements and time-dependent DFT calculations together reveal the dependence of excited-state structural distortions of [Pt(RC^N^NR')(CC-C6 F5 )] on the positional isomers of the tridentate ligand. Pt complexes [Pt(R-C^N^NR')(CC-Ar)] are efficient photocatalysts for visible-light-induced reductive CC bond formation. The [Pt(R-C^N^NR')(CC-C6 F5 )] complexes perform strongly as phosphorescent dopants for green- and red-emitting organic light-emitting diodes (OLEDs) with external quantum efficiency values over 22.1 %. These complexes are also applied in two-photon cellular imaging when incorporated into mesoporous silica nanoparticles (MSNs).
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Affiliation(s)
- Pui-Keong Chow
- State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P.R. China)
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44
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Chow PK, Cheng G, Tong GSM, To WP, Kwong WL, Low KH, Kwok CC, Ma C, Che CM. Luminescent Pincer Platinum(II) Complexes with Emission Quantum Yields up to Almost Unity: Photophysics, Photoreductive CC Bond Formation, and Materials Applications. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201408940] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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45
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Geist F, Jackel A, Winter RF. Dual ligand-based fluorescence and phosphorescence emission at room temperature from platinum thioxanthonyl complexes. Dalton Trans 2015; 44:3974-87. [DOI: 10.1039/c4dt02410a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Platinum complexes with σ-bonded thioxanthonyl (Tx) ligands exhibit, on irradiation into the Tx π→π* band, dual Tx-based fluorescence and phosphorescence emission with phosphorescence quantum yields of up to 19% in fluid solution at room temperature.
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Affiliation(s)
- Fabian Geist
- Fachbereich Chemie der Universität Konstanz
- D-78457 Konstanz
- Germany
| | - Andrej Jackel
- Fachbereich Chemie der Universität Konstanz
- D-78457 Konstanz
- Germany
| | - Rainer F. Winter
- Fachbereich Chemie der Universität Konstanz
- D-78457 Konstanz
- Germany
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46
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Sanning J, Ewen PR, Stegemann L, Schmidt J, Daniliuc CG, Koch T, Doltsinis NL, Wegner D, Strassert CA. Scanning-Tunneling-Spectroscopy-Directed Design of Tailored Deep-Blue Emitters. Angew Chem Int Ed Engl 2014; 54:786-91. [DOI: 10.1002/anie.201407439] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Indexed: 01/16/2023]
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47
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Zhang S, Pattacini R, Braunstein P, De Cola L, Plummer E, Mauro M, Gourlaouen C, Daniel C. Synthesis, structure, and optical properties of Pt(II) and Pd(II) complexes with oxazolyl- and pyridyl-functionalized DPPM-type ligands: a combined experimental and theoretical study. Inorg Chem 2014; 53:12739-56. [PMID: 25420195 DOI: 10.1021/ic501566u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
New square-planar complexes [Pt(1(-H))2] (2a) [1(-H) = (oxazolin-2-yl)bis(diphenylphosphino)methanide] and [Pd(1(-H))2] (2b), of general formula [M{(Ph2P)2C---C---NCH2CH2O}2] (M = Pt, 2a; M = Pd, 2b), result from deprotonation of 2-{bis(diphenylphosphino)methyl}oxazoline (1) at the PCHP site. The new, functionalized dppm-type ligand 4-{bis(diphenylphosphino)methyl}pyridine, (Ph2P)2CH(4-C5H4N) (4), was prepared by double lithiation and phosphorylation of 4-picoline. In the presence of NEt3, the reactions of 2 equiv of 4 with [PtCl2(NCPh)2] and [Pd(acac)2] (acac = acetylacetonate) afforded [Pt(4(-H))2] (5a) [4(-H) = bis(diphenylphosphino)(pyridin-4-yl)methanide] and [Pd(4(-H))2] (5b), of general formula [M{(Ph2P)2C(4-C5H4N)}2] (M = Pt, 5a; M = Pd, 5b), respectively. In the absence of base, the reactions of 2 equiv of 4 with [PtCl2(NCPh)2] and [PdCl2(NCPh)2] afforded (5a·2HCl) (6a) and (5b·2HCl) (6b), respectively, in which the PCHP proton of 4 has migrated from carbon to nitrogen to give a pyridinium derivative of general formula [M{(Ph2P)2C(4-C5H4NH)}2]Cl2 (M = Pt, 6a; M = Pd, 6b). The complexes 3a, 5a·2MeOH, and 6b·4CH2Cl2 have been structurally characterized by X-ray diffraction. The absorption/emission properties of the Pt(II) complexes 2a and 5a and the Pd(II) complexes 2b and 5b have been investigated by UV-vis spectroscopy and theoretical analysis based on density functional theory. The UV-vis absorption spectra of the neutral complexes recorded in dilute N,N'-dimethylformamide solutions are dominated by intense spin-allowed intraligand transitions in the region below 350 nm. The complexes exhibit charge-transfer bands between 350 and 500 nm. The experimental and theoretical absorption spectra agree qualitatively and point to two low-lying ligand-to-metal charge transfer states that contribute to the bands observed between 350 and 500 nm. The complexes are emissive in frozen solutions at 77 K, in the pure solid state, and when doped into films of poly(methyl methacrylate) but are nonemissive in solution. A red shift is observed when Pt(II) is replaced by Pd(II).
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Affiliation(s)
- Shuanming Zhang
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS/UdS), Université de Strasbourg , 4 rue Blaise Pascal, F-67081 Strasbourg, France
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48
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Naya L, Vázquez-García D, Fernández A, López-Torres M, Marcos I, Lenis OA, Pereira MT, Vila JM, Fernández JJ. Novel palladacycle N-heterocyclic carbene complexes with bidentate [C,N] and terdentate [C,N,N] and [C,N,O] Schiff bases. Synthesis, characterization and crystal structure analysis. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.07.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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49
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Yang C, Lai SL, Chan SLF, Low KH, Cheng G, Yeung KT, Kwok CC, Che CM. Phosphorescent cyclometalated iridium(III) complexes that contain substituted 2-acetylbenzo[b]thiophen-3-olate ligand for red organic light-emitting devices. Chem Asian J 2014; 9:3572-85. [PMID: 25297568 DOI: 10.1002/asia.201402782] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2014] [Indexed: 11/06/2022]
Abstract
We report the synthesis of a new class of thermally stable and strongly luminescent cyclometalated iridium(III) complexes 1-6, which contain the 2-acetylbenzo[b]thiophene-3-olate (bt) ligand, and their application in organic light-emitting diodes (OLEDs). These heteroleptic iridium(III) complexes with bt as the ancillary ligand have a decomposition temperature that is 10-20 % higher and lower emission self-quenching constants than those of their corresponding complexes with acetylacetonate (acac). The luminescent color of these iridium(III) complexes could be fine-tuned from orange (e.g., 2-phenyl-6-(trifluoromethyl)benzo[d]thiazole (cf3 bta) for 4) to pure red (e.g., lpt (Hlpt=4-methyl-2-(thiophen-2-yl)quinolone) for 6) by varying the cyclometalating ligands (C-deprotonated C^N). In particular, highly efficient OLEDs based on 6 as dopant (emitter) and 1,3-bis(carbazol-9-yl)benzene (mCP) as host that exhibit stable red emission over a wide range of brightness with CIE chromaticity coordinates of (0.67, 0.33) well matched to the National Television System Committee (NTSC) standard have been fabricated along with an external quantum efficiency (EQE) and current efficiency of 9 % and 10 cd A(-1) , respectively. A further 50 % increase in EQE (>13 %) by replacing mCP with bis[4-(6H-indolo[2,3-b]quinoxalin-6-yl)phenyl]diphenylsilane (BIQS) as host for 6 in the red OLED is demonstrated. The performance of OLEDs fabricated with 6 (i.e., [(lpt)2Ir(bt)]) was comparable to that of the analogous iridium(III) complex that bore acac (i.e., [(lpt)2 Ir(acac)]; 6a in this work) [Adv. Mater.- 2011, 23, 2981] fabricated under similar conditions. By using ntt (Hnnt=3-hydroxynaphtho[2,3-b]thiophen-2-yl)(thiophen-2-yl)methanone) ligand, a substituted derivative of bt, the [(cf3bta)2Ir(ntt)] was prepared and found to display deep red emission at around 700 nm with a quantum yield of 12 % in mCP thin film.
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Affiliation(s)
- Chen Yang
- HKU-CAS Joint Laboratory on New Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, Fax: (+852) 2915-5176; HKU Shenzhen Institute of Research and Innovation, Shenzhen 518053 (China)
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50
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Wang Z, Niu JL, Zhang LZ, Guo JW, Hao XQ, Song MP. Synthesis, characterization and photophysical properties of the pincer platinum(II) complexes with m-bis(benzimidazol-2′-yl)benzene ligand. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.08.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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