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Triplet Emitting C^N^C Cyclometalated Dibenzo[c,h]Acridine Pt(II) Complexes. Molecules 2022; 27:molecules27228054. [PMID: 36432153 PMCID: PMC9697690 DOI: 10.3390/molecules27228054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/11/2022] [Accepted: 11/15/2022] [Indexed: 11/22/2022] Open
Abstract
In a series of Pt(II) complexes [Pt(dba)(L)] containing the very rigid, dianionic, bis-cyclometalating, tridentate C^N^C2− heterocyclic ligand dba2− (H2dba = dibenzo[c,h]acridine), the coligand (ancillary ligand) L = dmso, PPh3, CNtBu and Me2Imd (N,N’-dimethylimidazolydene) was varied in order to improve its luminescence properties. Beginning with the previously reported dmso complex, we synthesized the PPh3, CNtBu and Me2Imd derivatives and characterized them by elemental analysis, 1H (and 31P) NMR spectroscopy and MS. Cyclic voltammetry showed partially reversible reduction waves ranging between −1.89 and −2.10 V and increasing along the series Me2Imd < dmso ≈ PPh3 < CNtBu. With irreversible oxidation waves ranging between 0.55 (L = Me2Imd) and 1.00 V (dmso), the electrochemical gaps range between 2.65 and 2.91 eV while increasing along the series Me2Imd < CNtBu < PPh3 < dmso. All four complexes show in part vibrationally structured long-wavelength absorption bands peaking at around 530 nm. TD-DFT calculated spectra agree quite well with the experimental spectra, with only a slight redshift. The photoluminescence spectra of all four compounds are very similar. In fluid solution at 298 K, they show broad, only partially structured bands, with maxima at around 590 nm, while in frozen glassy matrices at 77 K, slightly blue-shifted (~580 nm) bands with clear vibronic progressions were found. The photoluminescence quantum yields ΦL ranged between 0.04 and 0.24, at 298 K, and between 0.80 and 0.90 at 77 K. The lifetimes τ at 298 K ranged between 60 and 14040 ns in Ar-purged solutions and increased from 17 to 43 µs at 77 K. The TD-DFT calculated emission spectra are in excellent agreement with the experimental findings. In terms of high ΦL and long τ, the dmso and PPh3 complexes outperform the CNtBu and Me2Imd derivatives. This is remarkable in view of the higher ligand strength of Me2Imd, compared with all other coligands, as concluded from the electrochemical data.
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Stück R, Krause M, Brünink D, Buss S, Doltsinis NL, Strassert CA, Klein A. Luminescent Pd(II) Complexes with Tridentate
−
Aryl‐pyridine‐(benzo)thiazole Ligands. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- René Stück
- Universität zu Köln Mathematisch-Naturwissenschaftliche Fakultät Department für Chemie Institut für Anorganische Chemie Greinstraße 6 D-50939 Köln
| | - Maren Krause
- Universität zu Köln Mathematisch-Naturwissenschaftliche Fakultät Department für Chemie Institut für Anorganische Chemie Greinstraße 6 D-50939 Köln
| | - Dana Brünink
- Westfälische Wilhelms-Universität Münster Institut für Festkörpertheorie and Center for Multiscale Theory and Computation Wilhelm-Klemm-Straße 10 D-48149 Münster Germany
| | - Stefan Buss
- Westfälische Wilhelms-Universität Münster Institut für Anorganische und Analytische Chemie, CiMIC, CeNTech Heisenbergstraße 11 D-48149 Münster Germany
| | - Nikos L. Doltsinis
- Westfälische Wilhelms-Universität Münster Institut für Festkörpertheorie and Center for Multiscale Theory and Computation Wilhelm-Klemm-Straße 10 D-48149 Münster Germany
| | - Cristian A. Strassert
- Westfälische Wilhelms-Universität Münster Institut für Anorganische und Analytische Chemie, CiMIC, CeNTech Heisenbergstraße 11 D-48149 Münster Germany
| | - Axel Klein
- Universität zu Köln Mathematisch-Naturwissenschaftliche Fakultät Department für Chemie Institut für Anorganische Chemie Greinstraße 6 D-50939 Köln
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Cheung WM, Chong MC, Sung HHY, Cheng SC, Williams ID, Ko CC, Leung WH. Synthesis, structure and reactivity of iridium complexes containing a bis-cyclometalated tridentate C^N^C ligand. Dalton Trans 2021; 50:8512-8523. [PMID: 34060573 DOI: 10.1039/d1dt01269j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In an effort to synthesize cyclometalated iridium complexes containing a tridentate C^N^C ligand, transmetallation of [Hg(HC^N^C)Cl] (1) (H2C^N^C = 2,6-bis(4-tert-butylphenyl)pyridine) with various organoiridium starting materials has been studied. The treatment of 1 with [Ir(cod)Cl]2 (cod = 1,5-cyclooctadiene) in acetonitrile at room temperature afforded a hexanuclear Ir4Hg2 complex, [Cl(κ2C,N-HC^N^C)(cod)IrHgIr(cod)Cl2]2 (2), which features Ir-Hg-Ir and Ir-Cl-Ir bridges. Refluxing 2 with sodium acetate in tetrahydrofuran (thf) resulted in cyclometalation of the bidentate HC^N^C ligand and formation of trinuclear [(C^N^C)(cod)IrHgIr(cod)Cl2] (3). On the other hand, refluxing [Ir(cod)Cl]2 with 1 and sodium acetate in thf yielded [Ir(C^N^C)(cod)(HgCl)] (4). Chlorination of 4 with PhICl2 gave [Ir(C^N^C)(cod)Cl]·HgCl2 (5·HgCl2) that reacted with tricyclohexylphosphine to yield Hg-free [Ir(C^N^C)(cod)Cl] (5). Chloride abstraction of 5 with silver(i) triflate (AgOTf) gave [Ir(C^N^C)(cod)(H2O)](OTf) (6) that can catalyze the cyclopropanation of styrene with ethyl diazoacetate. Reaction of 1 and [Ir(CO)2Cl(py)] (py = pyridine) with sodium acetate in refluxing thf afforded [Ir(C^N^C)(HgCl)(py)(CO)] (7), in which the carbonyl ligand is coplanar with the C^N^C ligand. On the other hand, refluxing 1 with (PPh4)[Ir(CO)2Cl2] and sodium acetate in acetonitrile gave [Ir(C^N^C)(κ2C,N-HC^N^C)(CO)] (8), the carbonyl ligand of which is trans to the pyridyl ring of the bidentate HC^N^C ligand. Upon irradiation with UV light 8 in thf was isomerized to 8', in which the carbonyl is trans to a phenyl group of the bidentate HC^N^C ligand. The isomer pair 8 and 8' exhibited emission at 548 and 514 nm in EtOH/MeOH at 77 K with lifetime of 84.0 and 64.6 μs, respectively. Protonation of 8 with p-toluenesulfonic acid (TsOH) afforded the bis(bidentate) tosylate complex [Ir(κ2C,N-HC^N^C)2(CO)(OTs)] (9) that could be reconverted to 8 upon treatment with sodium acetate. The electrochemistry of the Ir(C^N^C) complexes has been studied using cyclic voltammetry. Reaction of [Ir(PPh3)3Cl] with 1 and sodium acetate in refluxing thf led to isolation of the previously reported compound [Ir(κ2P,C-C6H4PPh2)2(PPh3)Cl] (10). The crystal structures of 2-5, 8, 8', 9 and 10 have been determined.
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Affiliation(s)
- Wai-Man Cheung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - Man-Chun Chong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - Herman H-Y Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - Shun-Cheung Cheng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
| | - Ian D Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - Chi-Chiu Ko
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
| | - Wa-Hung Leung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
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Krause M, von der Stück R, Brünink D, Buss S, Doltsinis NL, Strassert CA, Klein A. Platinum and palladium complexes of tridentate −C^N^N (phen-ide)-pyridine-thiazol ligands – A case study involving spectroelectrochemistry, photoluminescence spectroscopy and TD-DFT calculations. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120093] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Qin S, Chong M, Cheung W, H.‐Y. Sung H, Williams ID, Leung W. Synthesis and Reactivity of Heterotrinuclear Platinum Cyclometalated Complexes Containing Bridging Nitrido Ligands. ChemistrySelect 2020. [DOI: 10.1002/slct.202002319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shiwei Qin
- Department of ChemistryThe Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
| | - Man‐Chun Chong
- Department of ChemistryThe Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
| | - Wai‐Man Cheung
- Department of ChemistryThe Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
| | - Herman H.‐Y. Sung
- Department of ChemistryThe Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
| | - Ian D. Williams
- Department of ChemistryThe Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
| | - Wa‐Hung Leung
- Department of ChemistryThe Hong Kong University of Science and Technology Clear Water Bay Kowloon, Hong Kong P. R. China
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Garbe S, Krause M, Klimpel A, Neundorf I, Lippmann P, Ott I, Brünink D, Strassert CA, Doltsinis NL, Klein A. Cyclometalated Pt Complexes of CNC Pincer Ligands: Luminescence and Cytotoxic Evaluation. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00015] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Simon Garbe
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, D-50939 Köln, Germany
| | - Maren Krause
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, D-50939 Köln, Germany
| | - Annika Klimpel
- Universität zu Köln, Department für Chemie, Institut für Biochemie, Zülpicher Strasse 47a, D-50674 Köln, Germany
| | - Ines Neundorf
- Universität zu Köln, Department für Chemie, Institut für Biochemie, Zülpicher Strasse 47a, D-50674 Köln, Germany
| | - Petra Lippmann
- Institute of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstraβe 55, D-38106 Braunschweig, Germany
| | - Ingo Ott
- Institute of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstraβe 55, D-38106 Braunschweig, Germany
| | - Dana Brünink
- Westfälische Wilhelms-Universität Münster, Institut für Festkörpertheorie and Center for Multiscale Theory and Computation, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Cristian A. Strassert
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie, CiMIC, CeNTech, Heisenbergstraße 11, D-48149 Münster, Germany
| | - Nikos L. Doltsinis
- Westfälische Wilhelms-Universität Münster, Institut für Festkörpertheorie and Center for Multiscale Theory and Computation, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Axel Klein
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, D-50939 Köln, Germany
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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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