Article
Polymer Science
Menghe Xu, Yongzheng Liu, Wenmin Pang, Yao Pan, Min Chen, Chen Zou, Chen Tan
Summary: Two alpha-diimine nickel dimethyl complexes with different steric hindrance effects were synthesized and characterized. Organoboron cocatalysts B(C6F5)3 or [Ph3C][B(C6F5)4] can activate these complexes for ethylene polymerization without the need for any organoaluminium cocatalysts or scavengers. B1 exhibits higher catalytic activity than B2, resulting in polyethylenes with slightly lower molecular weight, higher branching densities, and lower melting temperatures. The resulting polyolefins also display good tensile and elastic properties. DFT calculations suggest that the counter anion derived from B1 contributes to increased stability and activity.
Article
Biochemistry & Molecular Biology
Hui Wang, Weiqing Lu, Mingmin Zou, Shengyu Dai
Summary: Recently, polyolefin thermoplastic elastomers can be directly obtained via alpha-diimine nickel-catalyzed ethylene chain walking polymerization using ethylene as a single feedstock. A range of new bulky acenaphthene-based alpha-diimine nickel complexes were constructed and applied to ethylene polymerization. The activated nickel complexes exhibited good activity and produced polyethylene with high molecular weight and proper branching densities.
Article
Polymer Science
Ding-ding Zhao, Yan-Hui Hou, Ke-Ning Zong, Mi-Mi Cui, Bin-Yuan Liu, Min Yang
Summary: By synthesizing a novel catalytic system, the development of linear/branched block polyethylenes has been promoted successfully. The molecular weight, branching degree, and melting behavior of polyethylene can be controlled by adjusting the catalyst ratio and reaction conditions.
CHINESE JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
You Ge, Shuaikang Li, Weigang Fan, Shengyu Dai
Summary: In this study, novel α-diiminenickel and -palladium complexes containing flexible 8-alkylnaphthyl were investigated for their catalytic performance in ethylene polymerization. The nickel complexes displayed high activity and generated branched polyethylenes with broad or bimodal molecular weight distributions, while the palladium complexes showed moderate activity, producing highly branched polyethylenes with narrow molecular weight distributions. Additionally, the palladium complexes achieved highly branched E-MA copolymers with considerable MA incorporations, indicating their potential in copolymerization reactions. Compared to their rigid 8-arylnaphthyl counterparts, the flexible 8-alkylnaphthyl complexes exhibited significantly improved activity and produced lower or comparable molecular weight polyethylenes or E-MA copolymers.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Igor E. Soshnikov, Nina V. Semikolenova, Anna A. Bryliakova, Artem A. Antonov, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: A new room-temperature stable diamagnetic nickel complex has been discovered. Through H-1, H-2, and C-13 NMR spectroscopy and DFT calculations, this species has been identified as an antiferromagnetically coupled homodinuclear complex. Its behavior in the reaction solution is analogous to the resting state of nickel catalyzed ethylene polymerization.
Article
Chemistry, Applied
Jie Wu, Pei Li, Juan Zhang, Zhengquan Dong, Wu Li, Muhammad Sohail Bashir, Yougui Li, Fuzhou Wang
Summary: A class of nickel (II) complexes with variable electronic nature were synthesized and characterized. X-ray crystallography analysis showed that these complexes have a distorted tetrahedral geometry and can be used for chain-walking polymerization to obtain highly active and high molecular weight branched polymers.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Weiqing Lu, Hui Wang, Weigang Fan, Shengyu Dai
Summary: In this study, a bulky hybrid catalyst was designed and synthesized, which exhibited high activity and efficient copolymerization performance in the polymerization of ethylene. The hybrid catalyst generated highly branched polyethylenes with high molecular weights, showing advantages over the corresponding symmetrical catalysts.
INORGANIC CHEMISTRY
(2022)
Article
Polymer Science
Cheng Wang, Dan Wang, Tao Xu, Qisheng Zhang, Zhisheng Fu
Summary: The effects of N-aryl para-benzhydryl substitutes on the thermal stability of catalysts were investigated in this study. The factors affecting thermal stability, such as steric effect, electronic effect, stability of five-membered coordination ring, and N-aryl bond rotation, were systematically analyzed. The results showed that the introduction of large steric hindrance groups at the N-aryl para-position hindered the rotation of the N-aryl bond, leading to improved catalyst thermal stability. The obstacle effect weakened with the increase of ortho-substituent size.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Dan Li, Fengmin Ma, Lijun Guo, Jin Huang, Yu Zhang, Feng Li, Cuiqin Li
Summary: The newly synthesized polynuclear (alpha-diimine) nickel(II) complex (PS-Ni complex) shows good catalytic activity and selectivity for ethylene oligomerization, with higher activity compared to the corresponding mononuclear (alpha-diimine) nickel(II) complex.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Applied
Qiuyue Zhang, Ming Liu, Yanping Ma, Zhibin Ye, Tongling Liang, Wen-Hua Sun
Summary: A series of nickel bromide complexes containing rigid bidentate bis(arylimino)camphane ligands have been synthesized and characterized. These complexes exhibit good catalytic activity and thermal stability in ethylene polymerization, producing high molecular weight polyethylenes. The branching content and type of the resulting polyethylenes are influenced by the N-aryl substituents in the ligands.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jingshuang Yang, Xiaoqiang Hu, Zhongbao Jian
Summary: This study prepared photoresponsive catalysts by introducing azobenzene moieties into Ni(II) complexes, and modulated ethylene polymerization and copolymerization reactions through the trans-cis isomerization of azobenzene-functionalized Ni(II) catalysts, resulting in changes in the properties of the polymers.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Xiaohua Wang, Bo Dong, Qi Yang, Heng Liu, Yanming Hu, Xuequan Zhang
Summary: A new family of alpha-diimine palladium complexes was developed to promote norbornene polymerization at high temperatures, achieving high catalytic activities and producing polymers with high molecular weights. The conformational restriction caused by increasing bulkiness and intraligand hydrogen bonds effectively prevented deactivation of the active species at high temperatures, showing promising applications in olefin polymerization.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Weiqing Lu, Guoyong Xu, Guanru Chang, Hui Wang, Shengyu Dai
Summary: The types and sizes of N-o-aryl substituents strongly influence the activity of α-diimine Pd(II) catalysts; unsymmetrical acenaphthene-based α-diimine Pd(II) catalysts significantly enhance the branching of polyethylene and copolymerization ratio of E-MA copolymers in ethylene polymerization reactions.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2021)
Article
Polymer Science
Zahra Issaabadi, Hassan Arabi, Majid Karimi
Summary: In this study, a series of a-diimine Ni(II) complexes with camphyl backbone and various electron-donating and withdrawing substituents were synthesized and examined as catalysts for ethylene polymerization. The synthesized camphyl-based ligands were characterized by various spectroscopic techniques. The formation of the Ni(II) complexes was confirmed by spectroscopic analysis. The ligand electronic effect on the catalytic activity of Ni(II) complexes in ethylene polymerization was systematically investigated. All synthesized complexes exhibited high activity in ethylene polymerization.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Chemistry, Inorganic & Nuclear
Igor E. Soshnikov, Nina Semikolenova, Konstantin P. Bryliakov, Artem A. Antonov, Wen-Hua Sun, Evgenii P. Talsi
Summary: The nature of Ni(I) species formed upon the activation of N,N-alpha-diimine Ni(II) ethylene polymerization precatalyst with AlMe3 and MMAO has been studied in detail, showing the presence of neutral paramagnetic heterobinuclear complexes in toluene solutions. The impact of the cocatalyst/catalyst ratio on the relative concentrations of these complexes and their role in ethylene polymerization has been discussed.
Article
Chemistry, Physical
Tiago F. C. Cruz, Karina Shimizu, Jose M. S. S. Esperanca, Vania Andre, M. Teresa Duarte, Luis P. N. Rebelo, Pedro T. Gomes, Jose N. Canongia Lopes
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Chemistry, Physical
Marwa Belkhiria, Melek Hajji, Ali Mechria, Tiago F. C. Cruz, Clara S. B. Gomes, Pedro T. Gomes, Taha Guerfel, Moncef Msaddek
JOURNAL OF MOLECULAR STRUCTURE
(2020)
Article
Chemistry, Inorganic & Nuclear
Tiago F. C. Cruz, Claudia A. Figueira, Luis F. Veiros, Pedro T. Gomes
Summary: A family of benzyl nickel(II) complexes of S-aryl-2-iminopyrrolyl ligands has been synthesized and characterized, demonstrating their behavior as aluminum-free catalysts for the oligo-/polymerization of ethylene. The complexes showed different catalytic activities and product characteristics in the polymerization of ethylene, with varying molecular weights and branching degrees.
Article
Chemistry, Inorganic & Nuclear
Tiago F. C. Cruz, Luis F. Veiros, Pedro T. Gomes
Summary: A well-defined single-component manganese(II) catalyst system for the hydrosilylation of aldehydes and ketones is presented. Complexes 1 and 2 were synthesized and characterized, with complex 2 proving to be highly active for the hydrosilylation of various aldehydes and ketones under mild conditions.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tiago F. C. Cruz, Patricia S. Lopes, Pedro T. Gomes
Summary: In this study, a series of allyl nickel complexes were synthesized and characterized by NMR spectroscopy, elemental analysis, and single crystal X-ray diffraction. Further investigation revealed that the presence of excess pyridine in the substrate led to a pyridine-assisted cis-trans isomerization process, indicating a specific molecular conformational change in these complexes.
Article
Chemistry, Inorganic & Nuclear
Tiago F. C. Cruz, Patricia S. Lopes, M. Amelia N. D. A. Lemos, Luis F. Veiros, Pedro T. Gomes
Summary: This study synthesized five dinuclear copper(I) complexes and analyzed their structure and electronic properties through NMR spectroscopy, elemental analysis, X-ray diffraction, DFT calculations, and cyclic voltammetry. It was found that these copper(I) complexes can serve as catalysts for azide-alkyne cycloaddition reactions, producing products with high yields and turnover frequencies.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Carina B. Fialho, Tiago F. C. Cruz, Ana I. Rodrigues, Maria Jose Calhorda, Luis F. Vieira Ferreira, Piotr Pander, Fernando B. Dias, Jorge Morgado, Antonio L. Macanita, Pedro T. Gomes
Summary: Six new four-coordinate tetrahedral boron complexes with 9-borafluoren-9-yl and diphenylboron cores attached to 8-quinolinolato ligand chromophores have been synthesized and characterized. These complexes exhibit delayed fluorescence (DF) in solid films, originating from triplet-triplet annihilation (TTA). Density functional theory (DFT) and time-dependent density functional theory (TDDFT) studies provide insights into the physical properties and electronic structures of these new luminophores. Furthermore, these compounds have been successfully applied as emitters in organic light-emitting diodes (OLEDs), achieving green-blue electroluminescence with good external quantum efficiency (EQE) and high luminance.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Applied
Henrique T. de Matos, Tiago F. C. Cruz, M. Amelia N. D. A. Lemos, Pedro T. Gomes
Summary: The role of 2-iminopyrrolyl copper(I) complexes in the Reversible-Deactivation Radical Polymerization (RDRP) of methyl methacrylate (MMA) is described. A family of mononuclear and binuclear 2-iminopyrrolyl copper(I) complexes with phosphine ligands were synthesized and characterized. Complex 7 achieved the best results, operating via the interplay of Atom Transfer Radical Polymerization/Organometallic Mediated Radical Polymerization (ATRP/OMRP) mechanisms.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Patricia S. Ferreira, Jose F. Malta, Nuno A. G. Bandeira, Alexander Allgaier, Joris van Slageren, Jose A. Paixao, Manuel Almeida, Laura C. J. Pereira, Pedro T. Gomes
Summary: A new homoleptic Co(ii) complex with two highly sterically congested 2-formiminopyrrolyl N,N'-chelating ligands is reported, showing slow relaxation of magnetization at zero static field. This compound has a large zero-field splitting parameter D of -42.6(4) cm(-1), resulting in a spin-reversal energy barrier U-eff of 85 cm(-1).
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Patricia S. Ferreira, Ana C. Cerdeira, Tiago F. C. Cruz, Nuno A. G. Bandeira, David Hunger, Alexander Allgaier, Joris van Slageren, Manuel Almeida, Laura C. J. Pereira, Pedro T. Gomes
Summary: In this study, the authors characterized the structure and magnetic properties of four distorted tetrahedral homoleptic Co(II) complexes. These complexes exhibit Single-Ion Magnet (SIM) behavior, with large and negative magnetic anisotropy. Theoretical calculations showed that the axial anisotropy is mainly caused by electronic transitions, and the structural distortion was also explained and reproduced by calculations.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Krishnamoorthy Paramasivam, Carina B. Fialho, Tiago F. C. Cruz, Ana I. Rodrigues, Bruno Ferreira, Clara S. B. Gomes, Diogo Vila-Vicosa, Ana Charas, Jose M. S. S. Esperanca, Luis F. Vieira Ferreira, Maria Jose Calhorda, Antonio L. Macanita, Jorge Morgado, Pedro T. Gomes
Summary: A series of new tetracoordinate mononuclear 2-(N-phenylformimino)pyrrolyl boron chelates were synthesized and evaluated for their luminescent properties, with the complex based on 6 showing the best performance in organic light-emitting diodes.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Marwa Belkhiria, Melek Hajji, Ali Mechria, Salima Moftah H. Elmgirhi, Mohamed A. Habib, Tiago F. C. Cruz, Clara S. B. Gomes, Pedro T. Gomes, Radhouane Bel-Hadj-Tahar, Taha Guerfel, Moncef Msaddek
Summary: A neutral complex, [bis(2,6-dimethyl-N-((thiophen-2-yl)methylene) benzenamine))]nickel(II) dibromide, has been successfully synthesized and characterized, with its molecular structure and crystal assembly maintained by weak non-conventional C-H···Br hydrogen bonding, π···π and C-H···π interactions. The use of Hirshfeld surfaces visualizes intermolecular interactions, while DFT reactivity calculations and molecular electrostatic potential approach predict the most reactive sites in polar organic reactions for the studied system.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Ana Rodrigues, Paramasivam Krishnamoorthy, Clara S. B. Gomes, Nicolas Carmona, Roberto E. Di Paolo, Piotr Pander, Joao Pina, J. Sergio Seixas de Melo, Fernando B. Dias, Maria Jose Calhorda, Antonio L. Macanita, Jorge Morgado, Pedro T. Gomes
DALTON TRANSACTIONS
(2020)
Article
Chemistry, Inorganic & Nuclear
Ana Rodrigues, Claudia A. Figueira, Clara S. B. Gomes, D. Suresh, Bruno Ferreira, Roberto E. Di Paolo, Daniel de Sa Pereira, Fernando B. Dias, Maria Jose Calhorda, Jorge Morgado, Antonio L. Macanita, Pedro T. Gomes
DALTON TRANSACTIONS
(2019)
Article
Chemistry, Physical
Tiago F. C. Cruz, Laura C. J. Pereira, Joao C. Waerenborgh, Luis F. Veiros, Pedro T. Gomes
CATALYSIS SCIENCE & TECHNOLOGY
(2019)
Article
Chemistry, Inorganic & Nuclear
Guojun Hu, Ziyue Deng, Yanwei Wang, Dan Yuan, Yong Zhang, Yingming Yao
Summary: A series of rare-earth metal complexes were synthesized and used as efficient initiators for the polymerization of trimethylene carbonate (TMC) and (L)-lactide ((L)-LA).
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Van Ha Nguyen, John H. K. Yip
Summary: In this study, eight PtII-azulene complexes were synthesized to investigate the effect of metalation on the electronic structures, spectroscopy, and luminescence of organic chromophores. The results showed that the attachment of Pt substituents to azulene affected the HOMOs, LUMOs, and luminescence properties. The study provides insights into the role of metalation in modifying the properties of organic chromophores.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Moon Kedia, Virender Singh, Bhaskaran Shankar, Malaichamy Sathiyendiran
Summary: This study synthesized two types of neutral binuclear metallocycles using a one-pot solvothermal method and characterized their structures. The analysis revealed that these complexes adopt a binuclear heteroleptic cyclic architecture and belong to phosphine oxide donor (P=O)-based supramolecular coordination cyclic complexes.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Radhey S. Srivastava
Summary: This study demonstrates the effectiveness of zero-valent elements as reductants for the deoxydehydration reaction of polyols catalyzed by ONO-pincer ligated molybdenum dioxo. The insolubility and easy separability of the reductants and their oxidized products during the reaction are emphasized. Additionally, the choice of ligand has an impact on the catalytic performance of the reaction.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Hao Zhou, Yajun Sun, Li Deng, Weiran Yang, Yuehui Li
Summary: Efficient Ru-catalyzed hydrogenation of aldehydes was achieved using carbazole-derived phosphine ligands, with the crucial role of N-H moiety in promoting the catalytic reaction. The method was successfully applied in the Co/Ru-catalyzed hydroformylation process, resulting in the production of long-chain alcohols with excellent yields.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Theodor Danescu, Alexandru Lupan, Radu Silaghi-Dumitrescu, R. Bruce King
Summary: The structures and energies of complexes containing (Me2C2N2P)2Ru2(CO)n and (Me2C2N2P)2Fe2(CO)n have been studied. Low-energy structures are characterized by the presence of bridging diazaphospholyl rings, while higher-energy structures involve different ligand structures.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Savannah C. Kapper, Aamani Ponnekanti, Jonas Schaab, Tian-yi Li, Christine L. Chung, Gael Ung, Peter I. Djurovich, Mark E. Thompson
Summary: Organometallic iridium complexes with two cyclometalated ligands and one bis-oxazoline derived ancillary ligand were studied. These complexes have emission spanning across the visible and near-ultraviolet region, with moderate to high photoluminescence quantum yields. The (ppy)2Ir(BOX-CN) complexes were resolved into Delta- and Lambda-diastereomers based on solubility differences.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Zahra Karimi Sangari, Hossein Naeimi
Summary: In this research, a nanostructured CoCuFe2O4 catalyst was prepared using a brief and useful synthetic strategy. This catalyst was used for synthesizing 1,2,4,5-tetrasubstituted imidazole derivatives under ultrasonic irradiation. The approach offers advantages such as high efficiency, short reaction times, simplicity of the reaction medium, accelerated reaction rates, and easier separation and purification of products.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Rukhsana Gul, Wajid Munir, Ebraheem Abdu Musad Saleh, Shaukat Shujah, Muhammad Sirajuddin, Saira Tabassum, Khalil Ur Rehman, Dilfaraz Khan, Sameerah I. Al-Saeedi, Ehab A. Abdelrahman
Summary: Two new Schiff base ligands were synthesized and used to form copper, nickel, and cobalt complexes. The synthesized compounds were characterized and screened for various biological activities. The metal complexes showed better activities in antibacterial, antifungal, antidiabetic, and antioxidant assays.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Review
Chemistry, Inorganic & Nuclear
Ahsan Nazir, Pengwei Huo, Ameena Tur Rasool
Summary: This review explores the potential of g-C3N4-based S-scheme heterojunctions in addressing environmental issues. It summarizes the mechanism and preparation techniques of S-scheme heterojunctions based on g-C3N4, and presents recent studies on their applications in pollutant removal, CO2 reduction, hydrogen production, and bacterial disinfection. The review concludes with an outlook on future challenges for g-C3N4-based S-scheme heterojunctions.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Francois Mazars, Koffi Senam Etse, Guillermo Zaragoza, Lionel Delaude
Summary: The activity of three Pd-PEPPSI catalyst precursors with N-heterocyclic carbene (NHC) ligands derived from caffeine and theophylline in Mizoroki-Heck reactions was tested. The results showed that the catalysts achieved high conversions and yields, especially in the presence of electron-withdrawing substituents.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Bo-Han Wu, Xue Zhou, Lin Liu, Zheng-Bo Han
Summary: Researching carbon dioxide removal from flue gas and natural gas is crucial. Metal-organic frameworks (MOFs) are commonly used in adsorption due to their high surface area, porosity, and chemical properties. An ultra-microporous MOF CPM-20(Co) with mixed ligand was synthesized using inexpensive ligands. The material exhibited high selectivities and low regenerative energy, making it a promising option for CO2 separation in industries.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)