1
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Nguyen YH, Wu Y, Dang VQ, Jiang C, Teets TS. Combined Nucleophilic and Electrophilic Functionalization to Optimize Blue Phosphorescence in Cyclometalated Platinum Complexes. J Am Chem Soc 2024; 146:9224-9229. [PMID: 38517326 DOI: 10.1021/jacs.4c00203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Ligand-based functionalization strategies have emerged as powerful approaches to tune and optimize blue phosphorescence, which can involve nucleophilic addition to coordinated ligands or electrophilic functionalization via the coordination of exogenous Lewis acids. Whereas both have been used separately to enhance the photophysical properties of organometallic compounds with high-energy triplet states, in this work, we show that these two strategies can be used together on the same platform. Isocyanide-supported cyclometalated platinum compounds undergo nucleophilic addition with diethylamine to form a strong σ-donor acyclic diaminocarbene-supporting ligand. In a subsequent step, a cyanide ancillary ligand is converted into a more strongly π-acidic isocyanoborate via the coordination of a borane Lewis acid. Importantly, both of these ligand-based functionalization steps improve the quantum yields and lifetimes of the blue-phosphorescent complexes. This synergy results in complexes with photoluminescence quantum yields up to 0.40 for deep blue and 0.75 for sky blue regions and PL lifetimes on the order of 10-5 s.
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Affiliation(s)
- Yennie H Nguyen
- Department of Chemistry, University of Houston, 3585 Cullen Blvd. Room 112, Houston, Texas 77204-5003, United States
| | - Yanyu Wu
- Department of Chemistry, University of Houston, 3585 Cullen Blvd. Room 112, Houston, Texas 77204-5003, United States
| | - Vinh Q Dang
- Department of Chemistry, University of Houston, 3585 Cullen Blvd. Room 112, Houston, Texas 77204-5003, United States
| | - Chenggang Jiang
- Department of Chemistry, University of Houston, 3585 Cullen Blvd. Room 112, Houston, Texas 77204-5003, United States
| | - Thomas S Teets
- Department of Chemistry, University of Houston, 3585 Cullen Blvd. Room 112, Houston, Texas 77204-5003, United States
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2
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McNicholas BJ, Nie C, Jose A, Oyala PH, Takase MK, Henling LM, Barth AT, Amaolo A, Hadt RG, Solomon EI, Winkler JR, Gray HB, Despagnet-Ayoub E. Boronated Cyanometallates. Inorg Chem 2023; 62:2959-2981. [PMID: 36534001 DOI: 10.1021/acs.inorgchem.2c03066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Thirteen boronated cyanometallates [M(CN-BR3)6]3/4/5- [M = Cr, Mn, Fe, Ru, Os; BR3 = BPh3, B(2,4,6,-F3C6H2)3, B(C6F5)3] and one metalloboratonitrile [Cr(NC-BPh3)6]3- have been characterized by X-ray crystallography and spectroscopy [UV-vis-near-IR, NMR, IR, spectroelectrochemistry, and magnetic circular dichroism (MCD)]; CASSCF+NEVPT2 methods were employed in calculations of electronic structures. For (t2g)5 electronic configurations, the lowest-energy ligand-to-metal charge-transfer (LMCT) absorptions and MCD C-terms in the spectra of boronated species have been assigned to transitions from cyanide π + B-C borane σ orbitals. CASSCF+NEVPT2 calculations including t1u and t2u orbitals reproduced t1u/t2u → t2g excitation energies. Many [M(CN-BR3)6]3/4- complexes exhibited highly electrochemically reversible redox couples. Notably, the reduction formal potentials of all five [M(CN-B(C6F5)3)6]3- anions scale with the LMCT energies, and Mn(I) and Cr(II) compounds, [K(18-crown-6)]5[Mn(CN-B(C6F5)3)6] and [K(18-crown-6)]4[Cr(CN-B(C6F5)3)6], are surprisingly stable. Continuous-wave and pulsed electron paramagnetic resonance (EPR; hyperfine sublevel correlation) spectra were collected for all Cr(III) complexes; as expected, 14N hyperfine splittings are greater for (Ph4As)3[Cr(NC-BPh3)6] than for (Ph4As)3[Cr(CN-BPh3)6].
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Affiliation(s)
- Brendon J McNicholas
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Cherish Nie
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Anex Jose
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California94305, United States
| | - Paul H Oyala
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Michael K Takase
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Larry M Henling
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Alexandra T Barth
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Alessio Amaolo
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Ryan G Hadt
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Edward I Solomon
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California94305, United States
| | - Jay R Winkler
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Harry B Gray
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States
| | - Emmanuelle Despagnet-Ayoub
- Department of Chemistry, Occidental College, 1600 Campus Road, Los Angeles, California90041, United States
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3
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Schmid L, Chábera P, Rüter I, Prescimone A, Meyer F, Yartsev A, Persson P, Wenger OS. Borylation in the Second Coordination Sphere of Fe II Cyanido Complexes and Its Impact on Their Electronic Structures and Excited-State Dynamics. Inorg Chem 2022; 61:15853-15863. [PMID: 36167335 PMCID: PMC9554916 DOI: 10.1021/acs.inorgchem.2c01667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
![]()
Second coordination sphere interactions
of cyanido complexes with hydrogen-bonding solvents and Lewis acids
are known to influence their electronic structures, whereby the non-labile
attachment of B(C6F5)3 resulted in
several particularly interesting new compounds lately. Here, we investigate
the effects of borylation on the properties of two FeII cyanido complexes in a systematic manner by comparing five different
compounds and using a range of experimental techniques. Electrochemical
measurements indicate that borylation entails a stabilization of the
FeII-based t2g-like orbitals by up to 1.65 eV,
and this finding was confirmed by Mössbauer spectroscopy. This
change in the electronic structure has a profound impact on the UV–vis
absorption properties of the borylated complexes compared to the non-borylated
ones, shifting their metal-to-ligand charge transfer (MLCT) absorption
bands over a wide range. Ultrafast UV–vis transient absorption
spectroscopy provides insight into how borylation affects the excited-state
dynamics. The lowest metal-centered (MC) excited states become shorter-lived
in the borylated complexes compared to their cyanido analogues by
a factor of ∼10, possibly due to changes in outer-sphere reorganization
energies associated with their decay to the electronic ground state
as a result of B(C6F5)3 attachment
at the cyanido N lone pair. Borylation
in the second coordination sphere of two well-known
FeII cyanido complexes leads to isocyanoborato complexes.
The effects of borylation on their electronic structure and photophysical
properties are thoroughly investigated with a range of experimental
techniques.
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Affiliation(s)
- Lucius Schmid
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Pavel Chábera
- Department of Chemical Physics, Lund University, P.O. Box 12 4, 22100 Lund, Sweden
| | - Isabelle Rüter
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Alessandro Prescimone
- Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Franc Meyer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Arkady Yartsev
- Department of Chemical Physics, Lund University, P.O. Box 12 4, 22100 Lund, Sweden
| | - Petter Persson
- Theoretical Chemistry Division, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | - Oliver S Wenger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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4
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Zheng Z, Zhu ZL, Ho CL, Yiu SM, Lee CS, Suramitr S, Hannongbua S, Chi Y. Stepwise Access of Emissive Ir(III) Complexes Bearing a Multi-Dentate Heteroaromatic Chelate: Fundamentals and Applications. Inorg Chem 2022; 61:4384-4393. [PMID: 35243862 DOI: 10.1021/acs.inorgchem.1c03794] [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
Three multi-dentate coordinated chelates LnH2 (n = 1, 2, and 3), comprising a linked 1-(pyridin-2-yl)ethylbenzene and one pyrazolyl pyridine unit and showing either tridentate or tetradentate coordination modes, are successfully designed and synthesized. Dinuclear Ir(III) complexes [Ir(κ4-Ln)(μ-Cl)]2 bearing tetradentate coordinated κ4-Ln chelate (2a, n = 1; 2b, n = 2; 2c, n = 3) were next obtained en route from the respective intermediate [Ir(κ3-LnH)Cl(μ-Cl)]2 bearing the tridentate coordinated κ3-LnH chelate (1a, n = 1; 1b, n = 2; 1c, n = 3). Next, mononuclear Ir(III) complexes Ir(κ4-Ln)(thd) (3a, n = 1; 3b, n = 2; 3c, n = 3) with the tetradentate chelate were obtained upon treatment of 2 with 2,2,6,6-tetramethyl-3,5-heptanedione (thd)H in the presence of K2CO3. Concurrently, methylation of 2c in the presence of MeI and nBu4NCl afforded tridentate Ir(κ3-L3HMe)Cl3 (4) and, next, can be converted to tetradentate Ir(κ4-L3Me)Cl2 (5) by further cyclometalation and HCl elimination in refluxing diethylene glycol monoethyl ether solution. The Ir(III) complexes 3a, 4, and 5 were unambiguously identified using spectroscopic methods, together with single-crystal X-ray structural analyses on Ir(III) derivatives 3a, 4, and 5. Their photophysical and ,electrochemical properties and device fabrication properties were also investigated and compared with results from theoretical studies.
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Affiliation(s)
- Zhong Zheng
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Ze-Lin Zhu
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Cheuk-Lam Ho
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, 999077, P.R. China.,PolyU Shenzhen Research Institute, Shenzhen 518057, P.R. China
| | - Shek-Man Yiu
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Chun-Sing Lee
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Songwut Suramitr
- Department of Chemistry, and Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
| | - Supa Hannongbua
- Department of Chemistry, and Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
| | - Yun Chi
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, 999077, China
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5
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Schmid L, Glaser F, Schaer R, Wenger OS. High Triplet Energy Iridium(III) Isocyanoborato Complex for Photochemical Upconversion, Photoredox and Energy Transfer Catalysis. J Am Chem Soc 2022; 144:963-976. [PMID: 34985882 DOI: 10.1021/jacs.1c11667] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cyclometalated Ir(III) complexes are often chosen as catalysts for challenging photoredox and triplet-triplet-energy-transfer (TTET) catalyzed reactions, and they are of interest for upconversion into the ultraviolet spectral range. However, the triplet energies of commonly employed Ir(III) photosensitizers are typically limited to values around 2.5-2.75 eV. Here, we report on a new Ir(III) luminophore, with an unusually high triplet energy near 3.0 eV owing to the modification of a previously reported Ir(III) complex with isocyanoborato ligands. Compared to a nonborylated cyanido precursor complex, the introduction of B(C6F5)3 units in the second coordination sphere results in substantially improved photophysical properties, in particular a high luminescence quantum yield (0.87) and a long excited-state lifetime (13.0 μs), in addition to the high triplet energy. These favorable properties (including good long-term photostability) facilitate exceptionally challenging organic triplet photoreactions and (sensitized) triplet-triplet annihilation upconversion to a fluorescent singlet excited state beyond 4 eV, unusually deep in the ultraviolet region. The new Ir(III) complex photocatalyzes a sigmatropic shift and [2 + 2] cycloaddition reactions that are unattainable with common transition metal-based photosensitizers. In the presence of a sacrificial electron donor, it furthermore is applicable to demanding photoreductions, including dehalogenations, detosylations, and the degradation of a lignin model substrate. Our study demonstrates how rational ligand design of transition-metal complexes (including underexplored second coordination sphere effects) can be used to enhance their photophysical properties and thereby broaden their application potential in solar energy conversion and synthetic photochemistry.
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Affiliation(s)
- Lucius Schmid
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Felix Glaser
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Raoul Schaer
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Oliver S Wenger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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6
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Zhang M, Zhang SW, Wu C, Li W, Wu Y, Yang C, Meng Z, Xu W, Tang MC, Xie R, Meng H, Wei G. Fine Emission Tuning from Near-Ultraviolet to Saturated Blue with Rationally Designed Carbene-Based [3 + 2 + 1] Iridium(III) Complexes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:1546-1556. [PMID: 34978413 DOI: 10.1021/acsami.1c19127] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We designed and synthesized a new class of six phosphorescent [3 + 2 + 1] iridium(III) complexes [(pbib)Ir(C^C)CN] bearing a tridentate 1,3-bis(1-butylimidazolin-2-ylidene) phenyl N-heterocyclic carbene (NHC)-based pincer ligand (pbib), bidentate imidazole-based NHC ligands (C^C), and a monodentate cyano group and investigated their photophysical, electrochemical, and thermal stabilities and electroluminescent properties. The extended π-conjugation of the imidazole-based C^C ligand is found to be the key to fine-tune the emission energies from ultraviolet blue (λ = 378 nm) to saturated blue (λ = 482 nm), as shown by electrochemical and photophysical studies, which is also revealed by the density functional theory (DFT) and time-dependent DFT calculations. Vacuum-deposited organic light-emitting diode devices have been fabricated with these newly synthesized emitters and exhibited the best external quantum efficiency of 6.4% and Commission International de L'Éclairage (CIE) coordinates of (0.163, 0.096), where the CIE y is very similar to the National Television System Committee standard blue CIE (x, y) coordinates of (0.149, 0.085). These results indicate that the novel [3 + 2 + 1] coordinated iridium(III) complexes [(pbib)Ir(C^C)CN], having a saturated blue emission, not only could alleviate the photodegradation of the emitters when compared to [(pbib)Ir(pmi)CN] but also provide new design strategies of saturated-blue-emitting iridium(III) complexes.
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Affiliation(s)
- Meng Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Si-Wei Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Chengcheng Wu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Wansi Li
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Yuan Wu
- PURI Materials, Shenzhen 518133, China
| | - Chen Yang
- PURI Materials, Shenzhen 518133, China
| | - Zhimin Meng
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Wenzhan Xu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Man-Chung Tang
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Rongjun Xie
- College of Materials, Xiamen University, Xiamen 361005, China
| | - Hong Meng
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Guodan Wei
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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7
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Xu S, Yang D, Zhao J, Wang B, Qu J. Formation of thiolate-bridged diiron complexes featuring anionic isocyanide originating from the activation of counterions in the outer sphere. Dalton Trans 2021; 50:18027-18035. [PMID: 34825913 DOI: 10.1039/d1dt03482k] [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
Transition metal isocyanide complexes have attracted increasing attention owing to their versatile applications in catalytic organic transformations. Compared with metal complexes with neutral isocyanide ligands, those featuring anionic isocyanide groups are relatively rare and poorly understood. So far, there has been no report on structurally characterized metal anionic isocyanopentafluorophosphate complexes that may have potential for the development of some unique polymerization reactions. In this paper, we adopt a dicationic thiolate-bridged diiron complex as the reaction platform for the coordination activation and functionalization of cyanide. When treating with KCN, a facile salt metathesis with hexafluorophosphate anions occurred to generate monocyanide or dicyanide species. However, using trimethylsilyl cyanide as the substrate, an unsymmetrical diiron complex bearing a terminal [CNSiMe3] ligand and an anionic [NCPF5]- group derived from the activation of one non-coordinating anion PF6- was obtained in a high yield. Interestingly, due to the lability of the N-Si bond in the [CNSiMe3] ligand, it can play the role of an active site for the interaction with counter anions in the outer sphere. On one hand, this labile ligand can facilitate the activation of the P-F bond in PF6- and the C-B bond in BPh4- to afford structurally characterized thiolate-bridged diiron anionic isocyanopentafluorophosphate and isocyanotriphenylborate complexes, respectively. On the other hand, it can also interact with Lut·HCl to convert into a cyanide ligand stabilized by a hydrogen bonding interaction. This work represents a new synthetic pathway to furnish metal anionic isocyanide complexes.
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Affiliation(s)
- Sunlin Xu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Jinfeng Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
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8
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Schmid L, Kerzig C, Prescimone A, Wenger OS. Photostable Ruthenium(II) Isocyanoborato Luminophores and Their Use in Energy Transfer and Photoredox Catalysis. JACS AU 2021; 1:819-832. [PMID: 34467335 PMCID: PMC8395604 DOI: 10.1021/jacsau.1c00137] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Indexed: 05/28/2023]
Abstract
Ruthenium(II) polypyridine complexes are among the most popular sensitizers in photocatalysis, but they face some severe limitations concerning accessible excited-state energies and photostability that could hamper future applications. In this study, the borylation of heteroleptic ruthenium(II) cyanide complexes with α-diimine ancillary ligands is identified as a useful concept to elevate the energies of photoactive metal-to-ligand charge-transfer (MLCT) states and to obtain unusually photorobust compounds suitable for thermodynamically challenging energy transfer catalysis as well as oxidative and reductive photoredox catalysis. B(C6F5)3 groups attached to the CN - ligands stabilize the metal-based t2g-like orbitals by ∼0.8 eV, leading to high 3MLCT energies (up to 2.50 eV) that are more typical for cyclometalated iridium(III) complexes. Through variation of their α-diimine ligands, nonradiative excited-state relaxation pathways involving higher-lying metal-centered states can be controlled, and their luminescence quantum yields and MLCT lifetimes can be optimized. These combined properties make the respective isocyanoborato complexes amenable to photochemical reactions for which common ruthenium(II)-based sensitizers are unsuited, due to a lack of sufficient triplet energy or excited-state redox power. Specifically, this includes photoisomerization reactions, sensitization of nickel-catalyzed cross-couplings, pinacol couplings, and oxidative decarboxylative C-C couplings. Our work is relevant in the greater context of tailoring photoactive coordination compounds to current challenges in synthetic photochemistry and solar energy conversion.
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Affiliation(s)
- Lucius Schmid
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Christoph Kerzig
- Department
of Chemistry, Johannes Gutenberg University
Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Alessandro Prescimone
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Oliver S. Wenger
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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9
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Wu Y, Yang C, Liu J, Zhang M, Liu W, Li W, Wu C, Cheng G, Yang Q, Wei G, Che CM. Phosphorescent [3 + 2 + 1] coordinated Ir(iii) cyano complexes for achieving efficient phosphors and their application in OLED devices. Chem Sci 2021; 12:10165-10178. [PMID: 34377406 PMCID: PMC8336439 DOI: 10.1039/d1sc01426a] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 06/21/2021] [Indexed: 11/29/2022] Open
Abstract
A series of neutral [3 + 2 + 1] coordinated iridium complexes bearing tridentate bis-NHC carbene chelates (2,6-bisimidazolylidene benzene), bidentate chelates (C^N ligands, e.g. derivatives of 2-phenylpridine), and monodentate ions (halides and pseudo-halides, such as Br, I, OCN and CN ions) have been systematically designed and synthesized. X-ray single crystal structure characterization revealed that the nitrogen atom in C^N ligands is located trans to the carbon atom in the benzene ring in tridentate chelates, while the coordinating carbon atom in C^N ligands is located trans to the monodentate ligands. Photophysical studies reveal that the C^N ligands play a vital role in tuning the UV absorption and emission properties, while the tridentate bis-NHC carbene chelates influence the lowest absorption band and emission energy when compared to heteroleptic Ir(ppy)2(acac) [i.e. molar absorptivities at ∼450 nm for ppy-OCN and Ir(ppy)2(acac) are 350 M−1 cm−1 and 1520 M−1 cm−1 and emission maximum peaks are at 465 nm and 515 nm respectively]. Among monodentate ligands that the complexes bear, the group containing the cyanide ligand displays higher emission energy, higher photophysical quantum yields, longer triplet lifetimes and better electrochemical and thermal stabilities than those of cyanate and bromide. Particularly, a blue organic light-emitting diode (OLED) based on dfppy-CN exhibited a maximum external quantum efficiency of 22.94% with CIE coordinates of (0.14, 0.24). Furthermore, a small efficiency roll-off of 5.7% was observed for this device at 1000 cd m−2. Construction of [3 + 2 + 1] coordinated iridium(iii) cyano complexes for achieving high-efficiency phosphors and their application in blue OLEDs with low efficiency roll-off.![]()
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Affiliation(s)
- Yuan Wu
- PURI Materials 6F, Block A, Jiazhaoye Xindong Kechuang Park, 71st Zone Xindong, Baoan District Shenzhen 518133 China
| | - Chen Yang
- PURI Materials 6F, Block A, Jiazhaoye Xindong Kechuang Park, 71st Zone Xindong, Baoan District Shenzhen 518133 China .,School of Chemical Engineering and Light Industry, Guangdong University of Technology Guangzhou 510006 China
| | - Jie Liu
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University Xi'an 710049 China
| | - Meng Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 China
| | - Weiqiang Liu
- State Key Laboratory of Synthetic Chemistry, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong Pokfulam Road Hong Kong SAR China
| | - Wansi Li
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 China
| | - Chengcheng Wu
- PURI Materials 6F, Block A, Jiazhaoye Xindong Kechuang Park, 71st Zone Xindong, Baoan District Shenzhen 518133 China
| | - Gang Cheng
- State Key Laboratory of Synthetic Chemistry, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong Pokfulam Road Hong Kong SAR China .,HKU Shenzhen Institute of Research and Innovation Shenzhen 518053 China
| | - Qingdan Yang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology Guangzhou 510006 China
| | - Guodan Wei
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 China
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong Pokfulam Road Hong Kong SAR China .,HKU Shenzhen Institute of Research and Innovation Shenzhen 518053 China
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10
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Cañada LM, Kölling J, Wen Z, Wu JIC, Teets TS. Cyano-Isocyanide Iridium(III) Complexes with Pure Blue Phosphorescence. Inorg Chem 2021; 60:6391-6402. [PMID: 33844525 DOI: 10.1021/acs.inorgchem.1c00103] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In this paper, we report a series of six neutral, blue-phosphorescent cyclometalated iridium complexes of the type Ir(C^Y)2(CNAr)(CN). The cyclometalating ligands in these compounds (C^Y) are either aryl-substituted 1,2,4-triazole or NHC ligands, known to produce complexes with blue phosphorescence. These cyclometalating ligands are paired with π-acidic, strongly σ-donating cyano and aryl isocyanide (CNAr) ancillary ligands, the hypothesis being that these ancillary ligands would destabilize the higher-lying ligand-field (d-d) excited states, allowing efficient blue photoluminescence. The compounds are prepared by substituting the cyanide ancillary ligand onto a chloride precursor and are characterized by NMR, mass spectrometry, infrared spectroscopy, and, for five of the compounds, by X-ray crystallography. Cyclic voltammetry establishes that these compounds have large HOMO-LUMO gaps. The mixed cyano-isocyanide compounds are weakly luminescent in solution, but they phosphoresce with moderate to good efficiency when doped into poly(methyl methacrylate) films, with Commission Internationale de L'Eclairage coordinates that indicate deep blue emission for five of the six compounds. The photophysical studies show that the photoluminescence quantum yields are greatly enhanced in the cyano complexes relative to the chloride precursors, affirming the benefit of strong-field ancillary ligands in the design of blue-phosphorescent complexes. Density functional theory calculations confirm that this enhancement arises from a significant destabilization of the higher-energy ligand-field states in the cyanide complexes relative to the chloride precursors.
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Affiliation(s)
- Louise M Cañada
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
| | - Johanna Kölling
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
| | - Zhili Wen
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
| | - Judy I-Chia Wu
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
| | - Thomas S Teets
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
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11
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Ngo DX, Del Ciello SA, Barth AT, Hadt RG, Grubbs RH, Gray HB, McNicholas BJ. Electronic Structures, Spectroscopy, and Electrochemistry of [M(diimine)(CN-BR 3) 4] 2- (M = Fe, Ru; R = Ph, C 6F 5) Complexes. Inorg Chem 2020; 59:9594-9604. [PMID: 32584033 DOI: 10.1021/acs.inorgchem.0c00632] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Complexes with the formula [M(diimine)(CN-BR3)4]2-, where diimine = bipyridine (bpy), phenanthroline (phen), 3,5-trifluoromethylbipyridine (flpy), R = Ph, C6F5, and M = FeII, RuII, were synthesized and characterized by X-ray crystal structure analysis, UV-visible spectroscopy, IR spectroscopy, and voltammetry. Three highly soluble complexes, [FeII(bpy)(CN-B(C6F5)3)4]2-, [RuII(bpy)(CN-B(C6F5)3)4]2-, and [RuII(flpy)(CN-B(C6F5)3)4]2-, exhibit electrochemically reversible redox reactions, with large potential differences between the bpy0/- or flpy0/- and MIII/II couples of 3.27, 3.52, and 3.19 V, respectively. CASSCF+NEVPT2 calculations accurately reproduce the effects of borane coordination on the electronic structures and spectra of cyanometallates.
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Affiliation(s)
- Danh X Ngo
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
| | - Sarah A Del Ciello
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
| | - Alexandra T Barth
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
| | - Ryan G Hadt
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
| | - Robert H Grubbs
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
| | - Harry B Gray
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
| | - Brendon J McNicholas
- Beckman Institute, and Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Mail Code 139-74, Pasadena, California 91125, United States
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12
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Xiao Y, Chu WK, Ng CO, Cheng SC, Tse MK, Yiu SM, Ko CC. Design and Synthesis of Luminescent Bis(isocyanoborato) Rhenate(I) Complexes as a Selective Sensor for Cyanide Anion. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00204] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yelan Xiao
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Wing-Kin Chu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Chi-On Ng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Shun-Cheung Cheng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Man-Kit Tse
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Chi-Chiu Ko
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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13
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Eremina AA, Kinzhalov MA, Katlenok EA, Smirnov AS, Andrusenko EV, Pidko EA, Suslonov VV, Luzyanin KV. Phosphorescent Iridium(III) Complexes with Acyclic Diaminocarbene Ligands as Chemosensors for Mercury. Inorg Chem 2020; 59:2209-2222. [DOI: 10.1021/acs.inorgchem.9b02833] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Anzhelika A. Eremina
- Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russian Federation
| | - Mikhail A. Kinzhalov
- Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russian Federation
| | - Evgene A. Katlenok
- Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russian Federation
| | - Andrey S. Smirnov
- Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russian Federation
| | - Elena V. Andrusenko
- TheoMAT Group, ITMO University, Lomonosova 9, St. Petersburg 191002, Russian Federation
| | - Evgeny A. Pidko
- TheoMAT Group, ITMO University, Lomonosova 9, St. Petersburg 191002, Russian Federation
- Inorganic Systems Engineering Group, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Vitalii V. Suslonov
- Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russian Federation
| | - Konstantin V. Luzyanin
- Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russian Federation
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
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14
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Han J, Tang KM, Cheng SC, Ng CO, Chun YK, Chan SL, Yiu SM, Tse MK, Roy VAL, Ko CC. Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01278h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.
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Affiliation(s)
- Jingqi Han
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | - Kin-Man Tang
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | | | - Chi-On Ng
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | - Yuen-Kiu Chun
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | - Shing-Lun Chan
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | - Shek-Man Yiu
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | - Man-Kit Tse
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
| | - Vellaisamy A. L. Roy
- Department of Materials Science and Engineering
- City University of Hong Kong
- Kowloon
- China
| | - Chi-Chiu Ko
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- China
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15
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Cheng S, Chu W, Ko C, Phillips DL. Excited State Dynamics of Isocyano Rhenium(I) Phenanthroline Complexes from Time‐Resolved Spectroscopy. Chemphyschem 2019; 20:1946-1953. [DOI: 10.1002/cphc.201900581] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 06/19/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Shun‐Cheung Cheng
- Department of ChemistryCity University of Hong Kong Tat Chee Avenue, Kowloon Tong Hong Kong SAR China
- Department of Chemistry, TheUniversity of Hong Kong Chong Yuet Ming Chemistry Building Pokfulam Road Hong Kong SAR China
| | - Wing‐Kin Chu
- Department of ChemistryCity University of Hong Kong Tat Chee Avenue, Kowloon Tong Hong Kong SAR China
| | - Chi‐Chiu Ko
- Department of ChemistryCity University of Hong Kong Tat Chee Avenue, Kowloon Tong Hong Kong SAR China
| | - David Lee Phillips
- Department of Chemistry, TheUniversity of Hong Kong Chong Yuet Ming Chemistry Building Pokfulam Road Hong Kong SAR China
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16
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Chakkaradhari G, Eskelinen T, Degbe C, Belyaev A, Melnikov AS, Grachova EV, Tunik SP, Hirva P, Koshevoy IO. Oligophosphine-thiocyanate Copper(I) and Silver(I) Complexes and Their Borane Derivatives Showing Delayed Fluorescence. Inorg Chem 2019; 58:3646-3660. [PMID: 30793896 PMCID: PMC6727211 DOI: 10.1021/acs.inorgchem.8b03166] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
![]()
The series of chelating phosphine
ligands, which contain bidentate P2 (bis[(2-diphenylphosphino)phenyl] ether, DPEphos; 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene,
Xantphos; 1,2-bis(diphenylphosphino)benzene, dppb), tridentate P3 (bis(2-diphenylphosphinophenyl)phenylphosphine),
and tetradentate P4 (tris(2-diphenylphosphino)phenylphosphine)
ligands, was used for the preparation of the corresponding dinuclear
[M(μ2-SCN)P2]2 (M = Cu, 1, 3, 5; M = Ag, 2, 4, 6) and mononuclear
[CuNCS(P3/P4)] (7, 9) and
[AgSCN(P3/P4)] (8, 10) complexes.
The reactions of P4 with silver
salts in a 1:2 molar ratio produce tetranuclear clusters [Ag2(μ3-SCN)(t-SCN)(P4)]2 (11) and [Ag2(μ3-SCN)(P4)]22+ (12). Complexes 7–11 bearing terminally coordinated SCN ligands were efficiently
converted into derivatives 13–17 with
the weakly coordinating –SCN:B(C6F5)3 isothiocyanatoborate ligand. Compounds 1 and 5–17 exhibit thermally
activated delayed fluorescence (TADF) behavior in the solid state.
The excited states of thiocyanate species are dominated by the ligand
to ligand SCN → π(phosphine) charge transfer transitions
mixed with a variable contribution of MLCT. The boronation of SCN
groups changes the nature of both the S1 and T1 states to (L + M)LCT d,p(M, P) → π(phosphine). The
localization of the excited states on the aromatic systems of the
phosphine ligands determines a wide range of luminescence energies
achieved for the title complexes (λem varies from
448 nm for 1 to 630 nm for 10c). The emission
of compounds 10 and 15, based on the P4 ligand, strongly depends on the
solid-state packing (λem = 505 and 625 nm for two
crystalline forms of 15), which affects structural reorganizations
accompanying the formation of electronically excited states. Copper(I) and silver(I) thiocyanate complexes containing di-, tri-,
and tetraphosphine ligands show efficient TADF in the solid state,
dominated by the ligand to ligand SCN → π(phosphine)
charge transfer, which is changed to d,p(M, P) → π(phosphine)
transitions for the isothiocyanatoborate derivatives. The wide variation
of the emission color from blue (448 nm) to red-orange (630 nm) is
attributed to the nature of the P-donor ligands and the packing effects,
influencing structural distortions in the excited state.
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Affiliation(s)
| | - Toni Eskelinen
- Department of Chemistry , University of Eastern Finland , 80101 Joensuu , Finland
| | - Cecilia Degbe
- Department of Chemistry , University of Eastern Finland , 80101 Joensuu , Finland
| | - Andrey Belyaev
- Department of Chemistry , University of Eastern Finland , 80101 Joensuu , Finland
| | - Alexey S Melnikov
- Peter the Great St. Petersburg Polytechnic University , Polytechnicheskaya, 29 , 195251 St. Petersburg , Russia
| | - Elena V Grachova
- Institute of Chemistry , St. Petersburg State University , Universitetskiy pr. 26, Petergof , 198504 St. Petersburg , Russia
| | - Sergey P Tunik
- Institute of Chemistry , St. Petersburg State University , Universitetskiy pr. 26, Petergof , 198504 St. Petersburg , Russia
| | - Pipsa Hirva
- Department of Chemistry , University of Eastern Finland , 80101 Joensuu , Finland
| | - Igor O Koshevoy
- Department of Chemistry , University of Eastern Finland , 80101 Joensuu , Finland
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17
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Kinzhalov MA, Parfenova SN, Novikov AS, Katlenok EA, Puzyk MV, Avdontceva MS, Bokach NA. Cyclometalated Iridium(III) Complexes Featuring Disubstituted Cyanamides. ChemistrySelect 2018. [DOI: 10.1002/slct.201802900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Mikhail A. Kinzhalov
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Suzanna N. Parfenova
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Alexander S. Novikov
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Evgeniy A. Katlenok
- Scientific-research laboratory of Ltd “THP”, Moscow highway 13, Saint Petersburg 196158 Russian Federation
| | - Mikhail V. Puzyk
- Herzen State Pedagogical University, Nab. reki Moiki 48 Saint Petersburg 191186 Russian Federation
| | - Margarita S. Avdontceva
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Nadezhda A. Bokach
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
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18
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Chan KC, Tong KM, Cheng SC, Ng CO, Yiu SM, Ko CC. Design of Luminescent Isocyano Rhenium(I) Complexes: Photophysics and Effects of the Ancillary Ligands. Inorg Chem 2018; 57:13963-13972. [DOI: 10.1021/acs.inorgchem.8b02536] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kin-Cheung Chan
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Ka-Ming Tong
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Shun-Cheung Cheng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Chi-On Ng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Chi-Chiu Ko
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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19
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Chan KC, Cheng SC, Lo LTL, Yiu SM, Ko CC. Luminescent Charge-Neutral Copper(I) Phenanthroline Complexes with Isocyanoborate Ligand. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701205] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kin-Cheung Chan
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
| | - Shun-Cheung Cheng
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
| | - Larry Tso-Lun Lo
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
| | - Shek-Man Yiu
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
| | - Chi-Chiu Ko
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
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20
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Scarpelli F, Ionescu A, Ricciardi L, Plastina P, Aiello I, La Deda M, Crispini A, Ghedini M, Godbert N. A novel route towards water-soluble luminescent iridium(iii) complexes via a hydroxy-bridged dinuclear precursor. Dalton Trans 2016; 45:17264-17273. [PMID: 27722340 DOI: 10.1039/c6dt02976k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The synthesis and photophysical characterization of a new family of luminescent water-soluble ionic iridium(iii) complexes of the general formula [(ppy)2Ir(bpy)]X are reported. The Ir(iii) complexes incorporate a cyclometalated 2-phenylpyridine (ppy), the ancillary ligand 2,2'-bipyridyl (bpy) and different counterions (X- = EtO-, OH-, EtOCH2CO2-, MeOCH2CO2-). These complexes were obtained starting from the cyclometalated Ir(iii) chloro-bridged dimer [(ppy)2Ir(μ-Cl)]2, for the first time synthesized through a new microwave assisted synthetic procedure, and subsequently converted into the corresponding hydroxy-bridged dimer [(ppy)2Ir(μ-OH)]2. The latter was eventually used as a sole reagent for the synthesis of all the reported complexes by simply varying the nature of the reaction solvent from water to alcohols and glycol ethers. This study demonstrates the versatility of the [(ppy)2Ir(μ-OH)]2 complex as a precursor to water soluble ionic Ir(iii) complexes. Indeed, [(ppy)2Ir(μ-OH)]2 has shown its peculiar chemical reactivity due to both a strong base character and an unexpected oxidative ability towards the alcoholic function of glycol ethers. All the synthesized complexes exhibit, in water solution, an orange emission centred at 606 nm. Moreover, all complexes display the ability to give rise to gel phases in water upon increasing their concentration, and the photophysical study evidenced the various interactions governing the gelification process. The water-solubility of these new luminescent Ir(iii) complexes makes them potentially useful in bio-related systems.
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Affiliation(s)
- Francesca Scarpelli
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy.
| | - Andreea Ionescu
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy.
| | - Loredana Ricciardi
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy. and Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia - Nanotec, UOS di Cosenza, Ponte Pietro Bucci Cubo 31/C, 87036 Rende, CS, Italy
| | - Pierluigi Plastina
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy.
| | - Iolinda Aiello
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy. and Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia - Nanotec, UOS di Cosenza, Ponte Pietro Bucci Cubo 31/C, 87036 Rende, CS, Italy
| | - Massimo La Deda
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy. and Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia - Nanotec, UOS di Cosenza, Ponte Pietro Bucci Cubo 31/C, 87036 Rende, CS, Italy
| | - Alessandra Crispini
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy. and Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia - Nanotec, UOS di Cosenza, Ponte Pietro Bucci Cubo 31/C, 87036 Rende, CS, Italy
| | - Mauro Ghedini
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy. and Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia - Nanotec, UOS di Cosenza, Ponte Pietro Bucci Cubo 31/C, 87036 Rende, CS, Italy
| | - Nicolas Godbert
- MAT-INLAB (Laboratorio di Materiali Molecolari Inorganici), LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, CS, Italy. and Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia - Nanotec, UOS di Cosenza, Ponte Pietro Bucci Cubo 31/C, 87036 Rende, CS, Italy
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21
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Barthelmes K, Jäger M, Kübel J, Friebe C, Winter A, Wächtler M, Dietzek B, Schubert US. Efficient Energy Transfer and Metal Coupling in Cyanide-Bridged Heterodinuclear Complexes Based on (Bipyridine)(terpyridine)ruthenium(II) and (Phenylpyridine)iridium(III) Complexes. Inorg Chem 2016; 55:5152-67. [DOI: 10.1021/acs.inorgchem.5b02919] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Kevin Barthelmes
- Laboratory
of Organic and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Center
for Energy and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Michael Jäger
- Laboratory
of Organic and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Center
for Energy and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Joachim Kübel
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute
of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Christian Friebe
- Laboratory
of Organic and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Center
for Energy and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Andreas Winter
- Laboratory
of Organic and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Center
for Energy and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Maria Wächtler
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Benjamin Dietzek
- Center
for Energy and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute
of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Ulrich S. Schubert
- Laboratory
of Organic and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Center
for Energy and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
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Maity A, Le LQ, Zhu Z, Bao J, Teets TS. Steric and Electronic Influence of Aryl Isocyanides on the Properties of Iridium(III) Cyclometalates. Inorg Chem 2016; 55:2299-308. [DOI: 10.1021/acs.inorgchem.5b02691] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Ayan Maity
- Department of Chemistry and ‡Department of Electrical and Computer Engineering, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - Linh Q. Le
- Department of Chemistry and ‡Department of Electrical and Computer Engineering, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - Zhuan Zhu
- Department of Chemistry and ‡Department of Electrical and Computer Engineering, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - Jiming Bao
- Department of Chemistry and ‡Department of Electrical and Computer Engineering, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - Thomas S. Teets
- Department of Chemistry and ‡Department of Electrical and Computer Engineering, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
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