Catalytic chemical recycling and upcycling of polyolefin plastics

Giant, Journal Year: 2024, Volume and Issue: 19, P. 100307 - 100307

Published: June 14, 2024

Polyolefins are the most produced and widely used polymeric materials. However, chemically inert nature of polyolefins has led to severe environmental pollution, posing a threat human sustenance development. Managing recycling polyolefin plastic waste is crucial for transition from linear sustainable circular economy. Catalytic chemical includes traditional techniques like pyrolysis photolysis, innovative methods that introduce cleavable bonds into chain closed-loop recycling. post-functionalization post-consumer materials another strategy tackle waste, aiming upgrade materials' utility contribute sustainability. Overall, developing catalytic deconstructing upcycling plastics essential encourage better reclamation practices reduce impact waste.

Language: Английский

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Optimizing Nickel(II) Complex Catalysts for High-Yield Oligomerization of Cyclohexyl Isocyanide

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Isocyanides, due to the divalent carbon atom present in their structure, are among most reactive groups of compounds organic chemistry. Unfortunately, although according literature they do not have acute toxicity, a very unpleasant odor that makes it difficult collaborate with them. However, despite properties mentioned, reactions isocyanides often lead variety functional materials. In this article, we modified method for obtaining isocyanide-based polymers significantly reduce release hazardous vapors into environment. For study, series nickel(II) metal ion complex containing ligands (e.g., 2,2'-bipyridyl, 1,10-phenanthroline, and diglycolate anion) were synthesized used as catalysts oligomerization reaction cyclohexyl isocyanide. The obtained oligomers subjected quantitative qualitative physicochemical analyses (FT-IR, MALDI-TOF-MS, TGA/DSC, DSC), which confirmed structure thermal properties. Reaction yields ranged from moderate (8-52%) extremely high (94%) single catalyst. catalytic systems new, previously undescribed isocyanide catalysts, successfully led synthesis poly(cyclohexyl isocyanide) allowed us obtain materials can be produce many useful polymeric

Language: Английский

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Pyridine vs. Thiazole in Cyclometalated N^C^N Ni(II) Complexes

Inorganics, Journal Year: 2025, Volume and Issue: 13(2), P. 41 - 41

Published: Feb. 1, 2025

Six N^C^N cyclometalated Ni(II) complexes [Ni(N^C^N)Cl] or [Ni(N^C^N’)Br] with symmetric non-symmetric N^C^N’ ligands in which the peripheral N-groups were varied pyridine (Py), 4-thiazole (4Tz), 2-thiazole (2Tz), and 2-benzothiazole (2Btz) complementing previously reported di(2-pyridyl)phenide [Ni(Py(Ph)Py)X] X = Cl Br. The synthesized from NiBr2 N^CH^N’ protoligands through base-assisted nickelation, while received N^C(Cl)^N [Ni(COD)2] (COD 1,5-cyclooctadiene). Introduction of 4Tz on both sides shifted electrochemical gap ΔEexp Eox–Ered long wavelength UV-vis absorption maxima to higher energies, 2Tz leads a shift lower energies. When introducing only one as groups, remaining PhPy moiety dominates electronic properties electrochemistry photophysics are very similar Py(Ph)Py derivatives. In contrast this, introduction 2Btz shifts values regardless two groups character frontier molecular orbitals complexes, DFT calculations show. Long-wavelength absorptions vary 416 443 nm, their energies correlate well first reduction potentials. Negishi-type C–C cross-coupling reactions gave total yields ranging 1 60% 44%. reactivities roughly Facilitated (E around –2 higher) goes generally along improved performance, making thiazole-containing interesting candidates for such catalysis.

Language: Английский

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Benign and Sustainable Methods for the Synthesis of Green Polymers

Elsevier eBooks, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

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Recent developments in polymer chemistry, medicinal chemistry and electro-optics using Ni and Pd-based catalytic systems

Journal of Materials Chemistry B, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Catalysis is the fastest and continuously growing field in chemistry. A key component of this process catalytic systems, which result increased reaction rates yields, as well ability to tailor properties products final application. With development catalysis, requirements for catalysts used these processes have also grown rapidly. Modern materials should overcome challenges posed by modern world They be durable, stable, good properties, allow carried out under mild environmentally friendly conditions. In article, we provide an overview recent reports on use systems based nickel palladium ions reactions, leading functional fields medicinal chemistry, polymer chemistry electro-optical Research optimization modification existing synthetic methods, synthesis new materials, articles new, more efficient that drawbacks are described. The presented article reviews current knowledge, providing newest information from catalysis advanced presenting potential directions further fields.

Language: Английский

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Sustainable hydrogen production from flare gas and produced water: A United States case study

Energy, Journal Year: 2024, Volume and Issue: 306, P. 132435 - 132435

Published: July 15, 2024

Language: Английский

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The Dimerization and Oligomerization of Alkenes Catalyzed with Transition Metal Complexes: Catalytic Systems and Reaction Mechanisms

Molecules, Journal Year: 2024, Volume and Issue: 29(2), P. 502 - 502

Published: Jan. 19, 2024

Dimers and oligomers of alkenes represent a category compounds that are in great demand diverse industrial sectors. Among the developing synthetic methods, catalysis alkene dimerization oligomerization using transition metal salts complexes is undoubted interest for practical applications. This approach demonstrates substantial potential, offering not only elevated reaction rates but also precise control over chemo-, regio-, stereoselectivity reactions. In this review, we discuss data on catalytic systems oligomerization. Our focus lies analysis how activity chemoselectivity these influenced by various factors, such as nature metal, ligand environment, activator, substrate structure. Notably, review particularly discusses mechanisms, encompassing complex activation, structural dynamic features, reactivity hydride intermediates, which serve potential catalytically active centers

Language: Английский

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Assessing the Character of the C₆F₅ Ligand from the Electrochemical and Photophysical Properties of [Ni(C₆F₅)₂(N^∧N)] Complexes

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(24), P. 11079 - 11091

Published: June 6, 2024

Organonickel complexes containing α-diimine ligands [Ni(C6F5)2(N∧N)] (N∧N = 2,2′-bipyridine (bpy), 2,9-dimethyl-1,10-phenanthroline (dmphen), 3,4,7,8-tetramethyl-1,10-phenanthroline (tmphen), dipyrido[3,2-a:2′,3′-c]phenazine (dppz), 1,4-bis(isopropyl)-1,4-diazabutadiene (iPr-DAB), and 1,4-bis(2,6-dimethylphenyl)-1,4-diazabutadiene (Xyl-DAB) were prepared studied structurally, spectroscopically, electrochemically. Their molecular structures from single-crystal X-ray diffraction show near-perfect square planar Ni(II) coordination except in the case of dmphen. Primary reversible electrochemical reductions range −1 to −2 V vs ferrocene/ferrocenium couple lead mainly diimine-localized radical anion complexes, while secondary −2.5 dianion as shown through spectroelectrochemistry. Irreversible metal-centered oxidations at around 0.7 result rapid aryl–aryl reductive elimination formation decafluorobiphenyl. No photoluminescence was detected for chromophoric room temperature. At 77 K frozen glassy 2-Me-THF matrices, weak dmphen tmphen derivatives, with broad emission bands peaking 570 nm. All results are rationalized support (TD-)DFT calculations, highlighting role C6F5 ligand different systems.

Language: Английский

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Chitosan microsphere-supported catalysts: design, synthesis and optimization for ethylene polymerization

Materials Advances, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Chitosan, a biopolymer derived from waste, is shaped as support to facilitate polymerization. Synthesis optimization was done by definitive screening design, while the generated catalysts were tested for polymerization and analyzed spectroscopy.

Language: Английский

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Dimerization and Oligomerization of Alkenes Catalyzed with Transition Metal Complexes: Catalytic Systems and Reaction Mechanisms

Published: Dec. 6, 2023

Dimers and oligomers of alkenes represent a category compounds that are in great demand for diverse industrial sectors. Among the developing synthetic methods, catalysis alkene dimerization oligomerization using transition metal salts complexes is undoubted interest practical application. This approach demonstrates substantial potential, offering not only elevated reaction rates but also precise control over chemo-, regio-, stereoselectivity reactions. In this review, we discuss data on catalytic systems oligomerization. Our focus lies analysis how activity chemoselectivity these influenced by various factors, such as nature metal, ligand environment, activator, substrate structure. Notably, review particularly discusses mechanisms, encompassing complex activation, structural dynamic features, reactivity hydride intermediates, which serve potential catalytically active centers

Language: Английский

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