Article
Multidisciplinary Sciences
Joanna Drzezdzon, Celina Mokwa, Artur Sikorski, Patrycja Parnicka, Adriana Zaleska-Medynska, Jacek Malinowski, Magdalena Kwiatkowska, Barbara Gawdzik, Dagmara Jacewicz
Summary: Nowadays, there are studies on the design and synthesis of new catalysts for olefin oligomerization and polymerization, with non-toxic metals and high catalytic activities. Transition metal complex compounds, such as Fe(II), Cr(III), and Zr(II), that contain pyridine or quinoline ligands have been found to exhibit moderate catalytic activity in ethylene and propylene polymerizations. In this study, a new cobalt(II) complex compound with bis(5-chloroquinolin-8-olato)-bis(pyridine) ligands was synthesized and tested for its catalytic activity in reactions of 2-chloro-2-propen-1-ol and norbornene oligomerizations. The results showed that the activated bis(5-chloroquinolin-8-olato)-bis(pyridine)-cobalt(II) catalyst can promote the formation of oligomers in nitrogen atmosphere, at atmospheric pressure, and at room temperature, demonstrating moderate catalytic activity in norbornene oligomerization and low catalytic activity in 2-chloro-2-propen-1-ol oligomerization.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Shi-Fang Yuan, Luyao Wang, Yi Yan, Tian Liu, Zygmunt Flisak, Yanping Ma, Wen-Hua Sun
Summary: A series of cobalt complexes with bulky groups on bis(imino)pyridine derivatives have been synthesized and characterized. The molecular structures of two representatives have been determined, showing distorted tetrahedral geometry. These complexes exhibit high activity in ethylene polymerization when activated with either MAO or MMAO, leading to polyethylene with high molecular weight and low dispersity. The presence of a methoxy-substituent significantly enhances the activity and molecular weight of the cobalt catalyst.
Article
Biochemistry & Molecular Biology
Nina Semikolenova, Mikhail A. Matsko, Vladimir A. Zakharov, Wen-Hua Sun
Summary: This study found that alpha-olefins can act as chain transfer agents in the presence of a specific catalyst, resulting in higher catalytic activities and improved quality of polyethylenes through regulation of molecular weights and molecular weight distribution.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Inorganic & Nuclear
Peter M. Chapple, Ghanem Hamdoun, Thierry Roisnel, Jean-Francois Carpentier, Hassan Oulyadi, Yann Sarazin
Summary: The versatility of a bulky bis(imino)carbazolate ligand in lead(ii) chemistry is demonstrated by the synthesis of various lead(ii) compounds, including a soluble heteroleptic lead(ii) fluoride, halides (Cl, Br, I), amides, and hydrocarbyl congeners, all of which have been structurally authenticated and analyzed using Pb-207 NMR data.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Peter M. Chapple, Ghanem Hamdoun, Thierry Roisnel, Jean-Francois Carpentier, Hassan Oulyadi, Yann Sarazin
Summary: The versatility of a bulky bis(imino)carbazolate ligand in lead(ii) chemistry is demonstrated through the synthesis of a soluble, heteroleptic lead(ii) fluoride and various congeners. All complexes have been structurally authenticated, and a complete set of Pb-207 NMR data is discussed.
DALTON TRANSACTIONS
(2021)
Article
Engineering, Chemical
Xueqin Xu, Zhiyan Chen, Yun Zhou, Huijie Liu, Haijiang Jia, Dirong Gong
Summary: In this study, 2,6-bis(1H'-allyl-benzimidazolyl)pyridine was successfully incorporated onto iron and cobalt and used as homogeneous catalysts for the polymerization of isoprene. The addition of disulfide carbon to the cobalt catalyst significantly improved the productivity and 3,4(+1,2) insertion. However, the diethylphosphite external donor only acted as a chain transfer agent in iron-catalyzed polymerization.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Na Zhang, Jinhui Mi, Suhong Huo, Lingpeng Meng, Xiaoyan Li
Summary: The detailed reaction mechanism of acetylene cyclotrimerization catalyzed by a heterobimetallic complex was computationally investigated, showing high activity and a main reaction pathway through inner sphere mechanism. By replacing V and Fe with different metals, a series of new catalysts were screened with varying energy barriers related to NPA charge and WBI of M-M bond.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Deepika Sahil, Ramalingam Thirumoorthi, Chandrakanta Dash
Summary: In this study, a copper(I)-bis(imino)pyridine-triphenylphosphine complex was successfully synthesized and characterized using various analysis methods. The complex exhibited a distorted tetrahedral geometry and was proven to be an effective catalyst for a one-pot multicomponent Click reaction in methanol, resulting in the synthesis of several 1,4-disubstituted 1,2,3-triazoles.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Polymer Science
Ruiyao Wu, Zhen Niu, Lingyun Huang, Zhu Xia, Zhanwei Feng, Yanlong Qi, Quanquan Dai, Long Cui, Jianyun He, Chenxi Bai
Summary: Four vanadium complexes with bulky ligands were synthesized and characterized in this study. They exhibited moderate to high catalytic activity in ethylene polymerization, producing polyethylenes with moderate to ultra-high molecular weights.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Multidisciplinary Sciences
Ryan Brisbin, Mark Bartolo, Michael Leville, Arya K. Rajan, Basharat Jahan, Kara E. McCloskey, Ajay Gopinathan, Sayantani Ghosh, Ryan Baxter
Summary: The study shows that by altering functional groups in the bis(imino)pyridine structure, the diameter of the three-dimensional multi-layered shells assembled by semiconductor quantum dots can be systematically adjusted. Differential scanning calorimetry confirms the relationship between shell sizes and ligand-induced perturbations in the liquid crystal phase transition temperature, allowing for analytical modeling of shell assembly energetics.
SCIENTIFIC REPORTS
(2022)
Article
Polymer Science
Desalegn Demise Sage, Qiuyue Zhang, Qaiser Mahmood, Yanping Ma, Ming Liu, Xiang Hao, Wen-Hua Sun
Summary: A series of nitro and 4,4'-fluorobenzhydryl functionalized bis(imino)pyridine-cobalt complexes were prepared and investigated for their catalytic activity in ethylene polymerization. Structural variations in the complexes were found to affect their polymerization activity and the molecular weight of the resulting polyethylenes.
Article
Chemistry, Multidisciplinary
Deepika Sahil, Seema Yadav, Chandrakanta Dash
Summary: This article describes the synthesis, characterization, and catalytic activity of copper(II)-bis(imino)pyridine pincer complexes. The copper(II) complexes (2a and 2b) were synthesized by reacting 2,6-bis(imino)pyridine ligands with CuCl2 center dot 2H(2)O in methanol. The copper(II) complexes showed excellent catalytic activity in azide-alkyne cycloaddition reactions, producing regioselective 1,4-disubstituted-1,2,3-triazole products. The copper(II) complex (2b) with an electron withdrawing CF3 group exhibited higher catalytic activity, achieving up to 93% yield with a catalyst loading of 0.05 mol%.
Article
Biochemistry & Molecular Biology
Ludmila G. Lavrenova, Olga G. Shakirova, Evgeniy Korotaev, Svetlana Trubina, Alexsei Ya Tikhonov, Irina A. Os'kina, Sergey A. Petrov, Konstantin Yu Zhizhin, Nikolay T. Kuznetsov
Summary: Novel iron(II) coordination compounds containing a ligand 2,6-bis(1H-imidazol-2-yl)pyridine (L) have been synthesized and studied. The complexes exhibit a spin crossover phenomenon at higher temperatures.
Article
Chemistry, Inorganic & Nuclear
Yosef Bayeh, Patrik Osusky, Nathan J. Yutronkie, Robert Gyepes, Assefa Sergawie, Peter Hrobarik, Rodolphe Clerac, Madhu Thomas
Summary: Investigations on the spin states of octahedral Fe(II) complexes have been conducted, and two mononuclear Fe(II) complexes were reported in this study. The results show that both complexes are in the diamagnetic LS state throughout the explored temperature range.
Article
Polymer Science
Hui Wang, Weiqing Lu, Huiqin Bi, Shengyu Dai
Summary: Introducing ortho-aryl dibenzosuberyl substituents into late-transition metal catalysts is an efficient way to retard chain transfer in olefin polymerization. In this study, it was found that dibenzosuberyl substituents can also suppress chain transfer and increase molecular weight in ethylene polymerization using bis(imino) pyridyl Fe(II) catalysts. A series of bis(imino) pyridyl ligands with unilateral diarylmethyl or dibenzosuberyl moiety were synthesized and characterized, and their corresponding Fe(II) catalysts exhibited high polymerization activity and generated high weight-average molecular weight polyethylenes with broad molecular weight distributions.
Article
Engineering, Chemical
Steven Wang, Woo Jin Lee, Chao'en Li, Benny Kuan, Nick Burke, Jim Patel
Article
Engineering, Chemical
Steven Wang, Woo Jin Lee, Chao'en Li, Benny Kuan, Nick Burke, Jim Patel
CHEMICAL ENGINEERING & TECHNOLOGY
(2019)
Article
Chemistry, Physical
Daniel Malko, Yanjun Guo, Pip Jones, George Britovsek, Anthony Kucernak
JOURNAL OF CATALYSIS
(2019)
Article
Chemistry, Physical
Charles E. J. J. Vriamont, Tianyi Chen, Charles Romain, Paul Corbett, Phornphit Manageracharath, Janet Peet, Christopher M. Conifer, Jason P. Hallett, George J. P. Britovsek
Article
Multidisciplinary Sciences
S. Shahruddin, G. Jimenez-Serratos, G. J. P. Britovsek, O. K. Matar, E. A. Mueller
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Applied
Craig T. Young, Richard von Goetze, Atanas K. Tomov, Francesco Zaccaria, George J. P. Britovsek
TOPICS IN CATALYSIS
(2020)
Article
Chemistry, Physical
Dillon W. P. Tay, James D. Nobbs, Charles Romain, Andrew J. P. White, Srinivasulu Aitipamula, Martin van Meurs, George J. P. Britovsek
Review
Polymer Science
Tian Sang, Christopher J. Wallis, Gavin Hill, George J. P. Britovsek
EUROPEAN POLYMER JOURNAL
(2020)
Article
Chemistry, Inorganic & Nuclear
Dillon W. P. Tay, James D. Nobbs, Srinivasulu Aitipamula, George J. P. Britovsek, Martin van Meurs
Summary: Phenylene-bridged diphobane ligands with different substituents have been synthesized and studied in palladium-catalyzed carbonylation reactions of various alkenes. The results show different selectivities between hydroformylation and alkoxycarbonylation, with the performance also influenced by the nature and amount of acid cocatalyst.
Article
Chemistry, Inorganic & Nuclear
Sarah K. Y. Ho, Francis Y. T. Lam, Adiran de Aguirre, Feliu Maseras, Andrew J. P. White, George J. P. Britovsek
Summary: The study investigates the photolytic activation of palladium(II) and platinum(II) complexes featuring the BPI ligand in various solvents, revealing the reactivity towards oxygen and formation of chloro complexes or peroxide intermediates. The reaction pathways differ for alkyl and aryl complexes based on the strength of the metal-carbon bonds, with UV irradiation affecting the reactivity of other components in the reaction mixture.
Article
Chemistry, Physical
Sarah K. Y. Ho, Chigozie Ezeorah, Suviti Chari, Ali Salehi-Reyhani, George J. P. Britovsek
Summary: The light-driven insertion reaction of oxygen into metal carbon bonds of BPI (1,3-bis(2-pyridylimino)isoindole) complexes [Pt(BPI)Me] and [Pd(BPI)Me] was studied using LED-NMR in CDCl3. The initial reaction formed peroxo complexes [Pt(BPI)OOMe] and [Pd(BPI)OOMe], which further reacted over time. Spectra were recorded at 1-minute intervals, allowing for tracking of the methyl substituent, which eventually produced formaldehyde and methanol in similar proportions. The presence of oxygen and light in the solvent CDCl3 led to side reactions, resulting in the formation of phosgene and DCl, as well as chloro methylformate and dimethyl carbonate.
Article
Polymer Science
Richard von Goetze, Ahmad Aljaber, Koon-Yang Lee, Gavin Hill, Christopher Wallis, George J. P. Britovsek
Summary: A series of end-functionalised polyethylene materials were synthesized via catalysed chain growth reaction. Different functional groups were introduced with varying effects. Blending polyethylene with polymers resulted in potential degradable blends.
Article
Chemistry, Physical
Quintin Lo, Dominic Pye, Sami Gesslbauer, Ying Sim, Felipe Garcia, Andrew J. P. White, George J. P. Britovsek
Summary: Several PNP-type diphosphine ligands with different N-bridging modes have been synthesized and characterized. These ligands exhibit good activities and selectivities for the tri- and tetramerization of ethylene, comparable to standard ligands. Computational studies also suggest that the binding of ethylene is favorable in these complexes, and the oligomerization mechanism involves both single and double ethylene insertions.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mengjun Gong, Yanjun Guo, Daniel Malko, Javier Rubio-Garcia, Jack M. S. Dawson, George J. P. Britovsek, Anthony Kucernak
Summary: Under mild conditions, aldehydes are efficiently converted to epoxides using a heterogeneous Fe-N/C catalyst, which forms the corresponding organic peroxy acid and acylperoxy radicals. Real-time monitoring of oxygen consumption and catalyst potential reveals the formation of peroxy acid and subsequent catalytic epoxidation. The involvement of aldehyde and Fe-N/C catalyst is shown to be the rate determining step for the reaction, and the induction time can be increased by adding a radical scavenger.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Maria M. Gragert, Atanas K. Tomov, Serge Bettonville, Gaelle Pannier, Andrew J. P. White, George J. P. Britovsek
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2020)
