Article
Chemistry, Multidisciplinary
Benon P. Maliszewski, Tahani A. C. A. Bayrakdar, Perrine Lambert, Lama Hamdouna, Xavier Trivelli, Luigi Cavallo, Albert Poater, Marek Belis, Olivier Lafon, Kristof Van Hecke, Dominic Ormerod, Catherine S. J. Cazin, Fady Nahra, Steven P. Nolan
Summary: In this study, the catalytic activity of a series of platinum(II) pre-catalysts with N-heterocyclic carbene (NHC) ligands in the alkene hydrosilylation reaction is reported. The structural and electronic properties of these catalysts are fully characterized using X-ray diffraction analysis and nuclear magnetic resonance spectroscopy (NMR). A structure-activity relationship within this group of pre-catalysts is established, and mechanistic insights into the catalyst activation step are provided. One of the complexes shows exceptional catalytic performance, achieving a turnover number (TON) of 970,000 and a turnover frequency (TOF) of 40,417 h(-1) at 1 ppm catalyst loading. Furthermore, a solvent-free and open-to-air alkene hydrosilylation protocol with efficient platinum removal (reducing residual Pt from 582 ppm to 5.8 ppm) is disclosed.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Xin Li, Yi-Lin Wang, Can Chen, Ying-Feng Han
Summary: In this study, a series of carbene-triphenylamine hybrids with tunable emission were synthesized. These hybrids can be converted to carbon-centered luminescent radicals with blue-to-cyan emissions or nitrogen-centered luminescent radicals with orange emissions through chemical reduction or oxidation, respectively. The nitrogen-centered radicals exhibited good stability in atmospheric air.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Thomas Scattolin, Giovanni Tonon, Eleonora Botter, Sebastien G. Guillet, Nikolaos V. Tzouras, Steven P. Nolan
Summary: The review focuses on the design of gold-based synthons that enable the synthesis of target complexes through simple steps under mild conditions. Mechanistic aspects of their synthesis and reactivity, as well as applications as efficient pre-catalysts, antitumor agents, and photo-emissive materials, are discussed.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Silvano R. Valandro, Ru He, James D. Bullock, Hadi Arman, Kirk S. Schanze
Summary: This study investigates the femto- and picosecond excited-state dynamics of a series of N-heterocyclic carbene ligand-containing platinum complexes, revealing ultrafast singlet to triplet intersystem crossing and subsequent relaxation processes influenced by ligand torsional modes and solvent viscosity. Experimental findings show that different conformers can be photoselected by varying excitation wavelengths, while density functional theory calculations suggest the impact of geometry and steric hindrance on the ground-state energy surface.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Julien Montagu, Geoffrey Gontard, J. A. Gareth Williams, Jamal Moussa
Summary: A series of cyclometallated platinum(II) complexes incorporating a rare and unique NC-chelating, pyridyl-pyridylidene ligand have been prepared through an unusual protodemethylation reaction. These complexes can incorporate acetylacetonate (acac) or 2-picolinate (pic) or 8-hydroxyquinolate as auxiliary ligands, and display unusual dual emission in a frozen glass.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Miguel Aller Pellitero, Isabel M. Jensen, Nathaniel L. Dominique, Lilian Chinenye Ekowo, Jon P. Camden, David M. Jenkins, Netzahualcoyotl Arroyo-Curras
Summary: N-Heterocyclic carbenes (NHCs) are promising monolayer-forming ligands that can overcome limitations of thiol-based monolayers in terms of stability, surface functionality, and reactivity across a variety of transition-metal surfaces. However, important questions remain regarding the stability of these monolayers when subjected to voltage perturbations, which is needed for applications with electrochemical platforms.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Maria Ines P. S. Leitao, Giulia Francescato, Clara S. B. Gomes, Ana Petronilho
Summary: The derivatization of nucleosides with organometallic compounds is a promising strategy for improving their therapeutic properties. In this study, metalated adenosine with deprotected ribose moiety was synthesized with platinum(II) N-heterocyclic carbene complexes, which showed different reactivities towards various reagents. The influence of different complexes on the cis-configuration was examined by NMR spectroscopy, revealing varying degrees of cis-influence based on the N-heterocyclic carbene ligands.
Article
Chemistry, Multidisciplinary
Arne Merschel, Dennis Rottschaefer, Beate Neumann, Hans-Georg Stammler, Mark Ringenberg, Maurice Van Gastel, T. Ilgin Demirer, Diego M. M. Andrada, Rajendra S. S. Ghadwal
Summary: In this study, we have successfully synthesized and isolated two stable anions K[SIPrBp] (4 a-K) and K[IPrBp] (4 b-K). These anions, derived from classical N-heterocyclic carbenes (NHCs), exist as violet crystalline solids.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Bastiaan Kooij, Zhaowen Dong, Paul Varava, Farzaneh Fadaei-Tirani, Rosario Scopelliti, Laura Piveteau, Kay Severin
Summary: This study reports the preparation and structural characterization of vanadium complexes with N-heterocyclic vinylidene ligands, enabled by utilizing diazoolefins as ligand precursors. Structural and theoretical analysis show that N-heterocyclic vinylidenes can act as strong 6e(-) donor ligands, forming strong metal-carbon interactions.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Runxia Nan, Yiwen Li, Zhouli Zhu, Fan Qi, Xu-Qiong Xiao
Summary: This study focused on the synthesis and transformation of functional groups in metallacarboranes, and investigated their impact on the structure and properties of the metallacarborane framework.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Carmela De Risi, Arianna Brandolese, Graziano Di Carmine, Daniele Ragno, Alessandro Massi, Olga Bortolini
Summary: Oxidative N-heterocyclic carbene (NHC) catalysis has the potential to achieve oxidative and oxygenative transformations, generating various NHC-bound intermediates and enabling non-umpolung processes through the activation of carbon atoms and heteroatoms. This review aims to discuss the recent developments in the field of oxidative NHC catalysis since 2014, with a focus on pivotal intermediates and their mechanistic involvement. More details can be found in the review article by C. De Risi and co-workers.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Carmela De Risi, Arianna Brandolese, Graziano Di Carmine, Daniele Ragno, Alessandro Massi, Olga Bortolini
Summary: Oxidative N-heterocyclic carbene (NHC) catalysis enables oxidative and oxygenative transformations, producing various NHC-bound intermediates and facilitating non-umpolung processes by activating carbon atoms and heteroatoms. This review discusses the developments in the literature on oxidative NHC catalysis since 2014, with a specific focus on pivotal intermediates and their mechanistic involvement.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Iris Berg, Einav Amit, Lillian Hale, F. Dean Toste, Elad Gross
Summary: In this study, a N-heterocyclic carbene (NHC) nanolayer was successfully anchored on the surface of a copper electrode using an electrochemical method, resulting in improved oxidation resistance of copper.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Qin Gao, Fei Peng, Chuanfei Wang, Jinqiang Lin, Xiaoyong Chang, Chao Zou, Wei Lu
Summary: The study synthesized and characterized several zwitterionic and cationic N-heterocyclic allenylidene platinum(II) complexes, and investigated their photophysical properties and intermolecular interactions. The results showed that these complexes exhibit stable luminescent properties in solution and high phosphorescent emission efficiency in the solid state. Additionally, zwitterionic N-heterocyclic allenylidene complexes can self-assemble into oligomers, with the phosphorescent emission being variable and controllable during the self-assembly process.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Review
Chemistry, Physical
Sourav Sekhar Bera, Michal Szostak
Summary: This comprehensive review presents catalytic methods utilizing cobalt-NHC complexes, focusing on catalyst structure, the role of the NHC ligand, properties of the catalytic system, mechanism, and synthetic utility. The survey suggests that well-defined cobalt-NHC catalysts have great potential in the design and application of catalytic reactions using more abundant 3d transition metals.
Article
Chemistry, Multidisciplinary
Jinfan Xiong, Kai Li, Teng Teng, Xiaoyong Chang, Yaxiong Wei, Chao Wu, Chuluo Yang
CHEMISTRY-A EUROPEAN JOURNAL
(2020)
Article
Chemistry, Inorganic & Nuclear
Ayuk M. Ako, Amal Cherian Kathalikkattil, Rory Elliott, Joaquin Soriano-Lopez, Ian M. McKeogh, Muhammad Zubair, Nianyong Zhu, Max Garcia-Melchor, Paul E. Kruger, Wolfgang Schmitt
INORGANIC CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Chao Wu, Weiqiang Liu, Kai Li, Gang Cheng, Jinfan Xiong, Teng Teng, Chi-Ming Che, Chuluo Yang
Summary: Intramolecular through-space charge-transfer (TSCT) excited states are utilized for developing thermally activated delayed fluorescence (TADF) emitters, with a series of precisely controlled TSCT emitters designed through alignment optimization of donor and acceptor segments. By increasing intramolecular pi-pi interactions, radiative decay rate of the lowest singlet excited state (S-1) is progressively enhanced with suppression of nonradiative decay, leading to significantly improved photoluminescence quantum yields of up to 0.99 in doped thin films. A high-efficiency electroluminescence device achieves a maximum external quantum efficiency (EQE) of 23.96% and maintains >20% at a brightness of 1000 cd m(-2), highlighting the importance of conformation control for high-efficiency intramolecular exciplex emitters.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Biochemistry & Molecular Biology
Teng Teng, Jinfan Xiong, Gang Cheng, Changjiang Zhou, Xialei Lv, Kai Li
Summary: A new series of tetrahedral heteroleptic copper(I) complexes have been developed, showing efficient thermally-activated delayed fluorescence with high PLQYs and a wide range of lifetimes. DFT calculations reveal the lowest-lying intraligand charge-transfer excited states, and OLEDs based on one of the new emitters achieved a maximum EQE of 7.96%.
Review
Chemistry, Inorganic & Nuclear
Kai Li, Yong Chen, Jian Wang, Chuluo Yang
Summary: The luminescence properties of transition metal complexes have been harnessed for various applications, with recent reports revealing novel emission behaviors and mechanisms. These findings suggest the potential for further exploration and exploitation of the photophysical properties of transition metal complexes.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Biochemistry & Molecular Biology
Rory Elliott, Aoife A. Ryan, Aviral Aggarwal, Nianyong Zhu, Friedrich W. Steuber, Mathias O. Senge, Wolfgang Schmitt
Summary: Metal-organic frameworks (MOFs) are a rapidly expanding class of materials with diverse potential applications, with 'rod MOFs' representing an underexplored subclass. In this study, two new 2D porphyrinic rod MOFs, PROD-1 and PROD-2, were prepared using a Cu-II complex, showcasing promising structural attributes for future photocatalytic investigations.
Article
Chemistry, Multidisciplinary
Youming Zhang, Jingsheng Miao, Jinfan Xiong, Kai Li, Chuluo Yang
Summary: This research developed dinuclear platinum(II) complexes using N-deprotonated alpha-carboline as bridging ligands for efficient red to NIR emission in doped thin films. The red OLEDs demonstrated high maximum external quantum efficiency (EQE), while the NIR OLEDs showed unprecedented EQE and radiance, with both red and NIR devices exhibiting very small efficiency roll-off at high brightness and appealing operational lifetimes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Jian-Gong Yang, Xiu-Fang Song, Jian Wang, Kai Li, Xiaoyong Chang, Li-Ying Tan, Chu-Xuan Liu, Fei-Hu Yu, Ganglong Cui, Gang Cheng, Wai-Pong To, Chuluo Yang, Chi-Ming Che, Yong Chen
Summary: Metal-based thermally activated delayed fluorescence (TADF) involving Au(I) emitters with carbazole and pyrazine-fused nitrogen-heterocyclic carbene (NHC) ligands exhibit efficient and short-lived green emissions. Computational studies reveal the key reverse intersystem crossing (RISC) pathway and suggest an alternative molecular design for OLED application. The coplanar orientation and proper separation of HOMO and LUMO contribute to the charge-transfer excited state with significant oscillator strength.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Jian-Gong Yang, Xiu-Fang Song, Gang Cheng, Siping Wu, Xingyu Feng, Ganglong Cui, Wai-Pong To, Xiaoyong Chang, Yong Chen, Chi-Ming Che, Chuluo Yang, Kai Li
Summary: In this study, a new class of carbene-Au-carbazolate complexes with twisted D-A conformation were developed. The presence of large aromatic substituents restricted the rotation of the Au-N bond, resulting in a twisted orientation. The twisted conformation decreased the energy gap between the lowest singlet excited state and the triplet manifold, and accelerated the reverse intersystem crossing rate, leading to improved delayed fluorescence efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Xingyu Feng, Jian-Gong Yang, Jingsheng Miao, Cheng Zhong, Xiaojun Yin, Nengquan Li, Chao Wu, Qizheng Zhang, Yong Chen, Kai Li, Chuluo Yang
Summary: This study demonstrates a strategy to improve the stability of gold(I) complexes by using a highly rigid and groove-like ligand to form dual Au⋅⋅⋅H-C hydrogen bonds. The complex exhibits appealing emission properties and improved stability. OLEDs show promising electroluminescence and operational stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Junjie Wang, Jingsheng Miao, Chenglin Jiang, Sai Luo, Chuluo Yang, Kai Li
Summary: This study found that by confining rigid and planar N- and B-centered donor and acceptor in sandwich-type structures, high-efficiency and improved color purity green TADF emissions can be achieved. Strong noncovalent pi-stacking interactions reduce intramolecular motions and enhance electronic coupling, further enhancing emission performance.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Fei-Hu Yu, Xiu-Fang Song, Guan-Hao Liu, Xiaoyong Chang, Kai Li, Ying Wang, Ganglong Cui, Yong Chen
Summary: A series of green to yellow TADF gold(I) complexes with alkynyl ligands have been developed for the first time, showing high photoluminescence quantum yields. By modifying the alkynyl ligands with electron-donating amino groups and using electron-deficient carbene ligands, the excited-state properties have been tuned to achieve TADF emission, leading to high external quantum efficiency in OLEDs.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Danwen Zhang, Chenglin Jiang, Zhenhua Wen, Xingyu Feng, Kai Li
Summary: This study reports the design and synthesis of a new type of through-space charge transfer emitters, which offers a way to enhance the thermally activated delayed fluorescence (TADF) of organic luminescent materials. The research found that the introduction of heavy atoms has adverse effects on the emission properties, resulting in lower photoluminescence quantum yields and longer delayed fluorescence lifetimes for the new emitters.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Junjie Wang, Nengquan Li, Cheng Zhong, Jingsheng Miao, Zhongyan Huang, Mingxin Yu, Yu Xuan Hu, Sai Luo, Yang Zou, Kai Li, Chuluo Yang
Summary: A high-performance MR-TADF emitter with high PLQY, short delayed fluorescence lifetime, and high color purity is achieved through coordination of Au with B/N-embedded polycyclic ligand. Vacuum-deposited OLEDs exhibit high-performance electroluminescence and the solution-processed OLED also achieves excellent performance.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhao Chen, Songwut Suramitr, Nianyong Zhu, Cheuk-Lam Ho, Supa Hannongbua, Shuming Chen, Wai-Yeung Wong
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
