1
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Yousuf N, Ma Y, Mahmood Q, Zhang W, Wang Y, Saeed H, Sun WH. Enhancing isoprene polymerization with high activity and adjustable monomer enchainment using cyclooctyl-fused iminopyridine iron precatalysts. Dalton Trans 2024; 53:753-764. [PMID: 38086665 DOI: 10.1039/d3dt03674j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
In this study, a series of structurally rigid cyclooctyl-fused iminopyridine iron complexes, [L2FeCl][FeCl4] and [2L3Fe][Cl][3FeCl4], was synthesized via a one-pot method and investigated as precatalysts in conjunction with methylaluminoxane for isoprene (Ip) polymerization. Combined characterization through FTIR analysis, elemental analysis and single crystal XRD analysis fully verified the structure of these complexes. The most active iron complex, FeH, exhibited a trisligated nature, with its cation adopting an octahedral geometry around the metal center. In contrast, all the other iron complexes (Fe2Me, Fe2Et, Fe2iPr, Fe3Me, Fe2Et,Me) displayed bisligated configurations, with distorted trigonal bipyramidal geometry of cations. During isoprene polymerization, the extent of steric hindrance of the ligand framework exerted a significant impact on catalytic performance. The FeH precatalyst with less steric hindrance demonstrated excellent performance, producing high molecular weight polyisoprenes with conversions exceeding 99% for 4000 equiv. of monomer. Even at very low catalyst loadings, as low as 0.0025 mol% (Fe/Ip), the polymerization of isoprene could proceed smoothly with an exceptionally high activity of 4.0 × 106 gPI (molFe, h)-1. Moreover, this precatalyst exhibited good thermal stability, maintaining high activity levels (typically 105 gPI (molFe, h)-1) across a broad temperature range from -20 °C to 100 °C. Additionally, by adjusting steric substituents and the reaction temperature, the 1,4/3,4 regioselectivity could be modulated from 9/91 to 69/31 while maintaining a high stereoselectivity of cis-1,4 structures (cis/trans: >99/1).
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Affiliation(s)
- Nighat Yousuf
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Qaiser Mahmood
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
| | - Wenjuan Zhang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China.
| | - Yizhou Wang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hassan Saeed
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China.
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China
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Du Y, Gao S, Ma H, Lu S, Zhang Z, Zhao M. Catalytic Behavior of Cobalt Complexes Bearing Pyridine-Oxime Ligands in Isoprene Polymerization. Polymers (Basel) 2023; 15:4660. [PMID: 38139912 PMCID: PMC10871112 DOI: 10.3390/polym15244660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 11/29/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023] Open
Abstract
Several cobalt(II) complexes Co1-Co3 bearing pyridine-oxime ligands (L1 = pyridine-2-aldoxime for Co1; L2 = 6-methylpyridine-2-aldoxime for Co2; L3 = phenyl-2-pyridylketoxime for Co3) and picolinaldehyde O-methyl oxime (L4)-supported Co4 were synthesized and well characterized by FT-IR, mass spectrum and elemental analysis. The single-crystal X-ray diffraction of complex Co2 reveals that the cobalt center of CoCl2 is coordinated with two 6-methylpyridine-2-aldoxime ligands binding with Npyridine and Noxime atoms, which feature a distorted octahedral structure. These Co complexes Co1-Co4 displayed extremely high activity toward isoprene polymerization upon activation with small amount of AlClEt2 in toluene, giving polyisoprene with high activity up to 16.3 × 105 (mol of Co)-1(h)-1. And, the generated polyisoprene displayed high molecular weights and narrow molecular distribution with a cis-1,4-enriched selectivity. The type of cobalt complexes, cocatalyst and reaction temperature all have effects on the polymerization activity but not on the microstructure of polymer.
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Affiliation(s)
- Yuanxu Du
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China; (Y.D.); (S.G.); (H.M.); (S.L.)
- College of Agriculture and Forestry, Linyi University, Linyi 276000, China
| | - Shuo Gao
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China; (Y.D.); (S.G.); (H.M.); (S.L.)
| | - Hui Ma
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China; (Y.D.); (S.G.); (H.M.); (S.L.)
| | - Siqi Lu
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China; (Y.D.); (S.G.); (H.M.); (S.L.)
| | - Zhenhua Zhang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China; (Y.D.); (S.G.); (H.M.); (S.L.)
| | - Mengmeng Zhao
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China; (Y.D.); (S.G.); (H.M.); (S.L.)
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3,4-Enhanced Polymerization of Isoprene Catalyzed by Side-Arm Tridentate Iminopyridine Iron Complex with High Activity: Optimization via Response Surface Methodology. Polymers (Basel) 2023; 15:polym15051231. [PMID: 36904470 PMCID: PMC10007258 DOI: 10.3390/polym15051231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 02/23/2023] [Accepted: 02/26/2023] [Indexed: 03/04/2023] Open
Abstract
3,4-Enhanced polymerization of isoprene catalyzed by late transition metal with high activity remains one of the great challenges in synthetic rubber chemistry. Herein, a library of [N, N, X] tridentate iminopyridine iron chloride pre-catalysts (Fe 1-4) with the side arm were synthesized and confirmed by the element analysis and HRMS. All the iron compounds served as highly efficient pre-catalysts for 3,4-enhanced (up to 62%) isoprene polymerization when 500 equivalent MAOs were utilized as co-catalysts, delivering the corresponding high-performance polyisoprenes. Furthermore, optimization via single factor and response surface method, it was observed that the highest activity was obtained by complex Fe 2 with 4.0889 × 107 g·mol(Fe)-1·h-1 under the following conditions: Al/Fe = 683; IP/Fe = 7095; t = 0.52 min.
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4
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Ricci G, Leone G, Zanchin G, Masi F, Guelfi M, Pampaloni G. Dichloro(2,2'-bipyridine)copper/MAO: An Active and Stereospecific Catalyst for 1,3-Diene Polymerization. Molecules 2023; 28:molecules28010374. [PMID: 36615567 PMCID: PMC9822443 DOI: 10.3390/molecules28010374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 12/23/2022] [Accepted: 12/28/2022] [Indexed: 01/03/2023] Open
Abstract
Dichloro(2,2'-bipyridine)copper was synthesized by reacting copper dichloride with bypyridine, and its behavior, in combination with methylaluminoxane (MAO), in the polymerization of butadiene, isoprene, 2,3-dimethyl-1,3 butadiene, and 3-methyl-1,3-pentadiene was examined. The purpose of this study is to find catalytic systems that are more sustainable than those currently used for the polymerization of butadiene and isoprene (e.g., Co and Ni), but that are comparable in terms of catalytic activity and selectivity. Predominantly, syndiotactic 1,2 polybutadiene, crystalline syndiotactic 3,4 polyisoprene, crystalline syndiotactic 1,2 poly(3-methyl-1,3-pentadiene), and crystalline cis-1,4 poly(2,3-dimethyl-1,3-butadiene) were obtained in a manner similar to that observed with the analogous iron complex. As far as we know, the investigated catalytic system represents the first example of a copper-based catalyst in the field of stereospecific polymerization. Given the great availability of copper, its extremely low toxicity (and therefore high sustainability), and the similarity of its behavior to that of iron, the result obtained seems to us of considerable interest and worthy of further investigation.
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Affiliation(s)
- Giovanni Ricci
- CNR—Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), Via A. Corti 12, I-20133 Milano, Italy
- Correspondence:
| | - Giuseppe Leone
- CNR—Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), Via A. Corti 12, I-20133 Milano, Italy
| | - Giorgia Zanchin
- CNR—Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), Via A. Corti 12, I-20133 Milano, Italy
| | - Francesco Masi
- Scientific Advisor, Via Galvani 7, I-26866 Sant’Angelo Lodigiano, Italy
| | - Massimo Guelfi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, I-56124 Pisa, Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, I-56124 Pisa, Italy
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Synthesis, Characterization and Catalytic Property Studies for Isoprene Polymerization of Iron Complexes Bearing Unionized Pyridine-Oxime Ligands. Polymers (Basel) 2022; 14:polym14173612. [PMID: 36080685 PMCID: PMC9459928 DOI: 10.3390/polym14173612] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/26/2022] [Accepted: 08/27/2022] [Indexed: 11/17/2022] Open
Abstract
Iron complexes of the types [Fe(HL)2Cl2] (Fe1: HL1 = pyridine-2-aldoxime; Fe2: HL2 = 6-methylpyridine-2-aldoxime; Fe3: HL3 = phenyl-2-pyridylketoxime; Fe4: HL4 = picolinaldehyde O-methyl oxime) were prepared and characterized by elemental analysis and IR spectroscopy. The crystal structure of Fe2, determined by single-crystal X-ray diffraction, featured a distorted octahedral coordination of the iron center binding with two ligands of HL2. The X-ray structure and infrared spectral data indicated that pyridine-oxime ligands act as unionized bidentate ligand by coordinating with Npyridine and Noxime. The catalytic performance for isoprene polymerization, catalyzed by these pyridine-oxime-ligated iron complexes, was examined. For a binary catalytic system combined with MAO, complexes Fe1, Fe3 and Fe4 were found to be highly active (up to 6.5 × 106 g/mol·h) in cis-1,4-alt-3,4 enchained polymerization, with average molecular weights in the range of 60–653 kg/mol and narrow PDI values of 1.7–3.5, even with very low amounts of MAO (Al/Fe = 5). Upon activation with [Ph3C][B(C6F5)4]/AlR3 for the ternary catalytic system, theses complexes showed extremely high activities, as well about 98% yield after 2 min, to afford cis-1,4-alt-3,4-polyisoprene with a molecular weight of 140–420 kg/mol.
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6
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Zhao M, Zhang X, Wang L, Wang L, Zhu G, Wang Q. Pyridine‐oxazoline ligated iron complexes: synthesis, characterization and catalytic activity for isoprene polymerization. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mengmeng Zhao
- School of Chemistry and Chemical Engineering Linyi University Linyi Shandong China
- Key Laboratory of Biobased Materials, Qingdao Institute of Biomass Energy and Bioprocess Technology Chinese Academy of Sciences Qingdao Shandong China
| | - Xianhui Zhang
- Key Laboratory of Structure & Materials for Aviation Tire, CHEMCHINA Shuguang Rubber Industry Research & Design Institute Co., Ltd Guilin Guangxi China
| | - Ledong Wang
- Key Laboratory of Structure & Materials for Aviation Tire, CHEMCHINA Shuguang Rubber Industry Research & Design Institute Co., Ltd Guilin Guangxi China
| | - Liang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Biomass Energy and Bioprocess Technology Chinese Academy of Sciences Qingdao Shandong China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials, Qingdao Institute of Biomass Energy and Bioprocess Technology Chinese Academy of Sciences Qingdao Shandong China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Biomass Energy and Bioprocess Technology Chinese Academy of Sciences Qingdao Shandong China
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7
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Ricci G, Leone G, Zanchin G, Palucci B, Boccia AC, Sommazzi A, Masi F, Zacchini S, Guelfi M, Pampaloni G. Highly Stereoregular 1,3-Butadiene and Isoprene Polymers through Monoalkyl- N-Aryl-Substituted Iminopyridine Iron Complex-Based Catalysts: Synthesis and Characterization. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giovanni Ricci
- CNR-Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via A. Corti 12, I-20133 Milano, Italy
| | - Giuseppe Leone
- CNR-Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via A. Corti 12, I-20133 Milano, Italy
| | - Giorgia Zanchin
- CNR-Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via A. Corti 12, I-20133 Milano, Italy
| | - Benedetta Palucci
- CNR-Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via A. Corti 12, I-20133 Milano, Italy
| | - Antonella Caterina Boccia
- CNR-Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via A. Corti 12, I-20133 Milano, Italy
| | - Anna Sommazzi
- Versalis S.P.A.─Centro Ricerca Novara, Via G. Fauser 4, I-28100 Novara, Italy
| | - Francesco Masi
- Versalis S.p.A.─R&D Partner Catalysis, Piazza Boldrini 1, I-20097 San Donato Milanese, Italy
| | - Stefano Zacchini
- Università di Bologna, Dipartimento di Chimica Industriale “Toso Montanari”, Viale Risorgimento 4, I-40136 Bologna, Italy
| | - Massimo Guelfi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, I-56124 Pisa, Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, I-56124 Pisa, Italy
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8
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Zhu G, Wang L, Kuang J, Xu G, Zhang Y, Wang Q. High Double Bond Content of Polyisoprene Synthesis via Cationic Polymerization Synergistically Catalyzed by Tf 2NH-Ionic Liquids. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00418] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guangqian Zhu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bio-energy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Liang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bio-energy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Jia Kuang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bio-energy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bio-energy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongqiang Zhang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bio-energy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bio-energy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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9
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Ricci G, Pampaloni G, Sommazzi A, Masi F. Dienes Polymerization: Where We Are and What Lies Ahead. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00004] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Giovanni Ricci
- CNR-Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), Via A. Corti 12, I-20133 Milano, Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, I-56124 Pisa, Italy
| | - Anna Sommazzi
- Centro Ricerca Novara, Versalis S.p.A., Via G. Fauser 4, I-28100 Novara, Italy
| | - Francesco Masi
- R&D Partner Catalysis, Versalis S.p.A., Piazza Boldrini 1, I-20097 San Donato Milanese (MI), Italy
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10
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Hashmi OH, Visseaux M, Champouret Y. Evidence of coordinative chain transfer polymerization of isoprene using iron iminopyridine/ZnEt 2 catalytic systems. Polym Chem 2021. [DOI: 10.1039/d1py00433f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Herein, the first example of a reversible iron-mediated chain transfer polymerisation of isoprene with ZnEt2 as the chain transfer agent is reported.
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Affiliation(s)
- Obaid H. Hashmi
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
| | - Marc Visseaux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
| | - Yohan Champouret
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
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11
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Zhao M, Wang L, Mahmood Q, Jing C, Zhu G, Zhang X, Chen X, Wang Q. Highly active and thermo‐stable iminopyridyl vanadium oxychloride catalyzed isoprene polymerization. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mengmeng Zhao
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Liang Wang
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Chuyang Jing
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
- Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences Beijing China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
- Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences Beijing China
| | - Xiao Chen
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences Qingdao China
- Center of Materials Science and Optoelectronics Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences Beijing China
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12
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Wang L, Wang X, Hou H, Zhu G, Han Z, Yang W, Chen X, Wang Q. An unsymmetrical binuclear iminopyridine-iron complex and its catalytic isoprene polymerization. Chem Commun (Camb) 2020; 56:8846-8849. [PMID: 32633282 DOI: 10.1039/d0cc04122j] [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 series of chloride-bridged unsymmetrical mixed Fe(ii)-HS/Fe(ii)-LS binuclear structures has been prepared and characterized. Upon activation with MAO, highly efficient catalytic polymerization of isoprene was achieved, delivering an ultra-high molecular weight (catalyst loading = 2.5 ppm, Mn = 1.8 × 106 g mol-1, Mw/Mn = 1.4).
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Affiliation(s)
- Liang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
| | - Hongbin Hou
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China. and Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhenyu Han
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China. and Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Weiying Yang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China. and Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiao Chen
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
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13
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Lin W, Zhang L, Suo H, Vignesh A, Yousuf N, Hao X, Sun WH. Synthesis of characteristic polyisoprenes using rationally designed iminopyridyl metal (Fe and Co) precatalysts: investigation of co-catalysts and steric influence on their catalytic activity. NEW J CHEM 2020. [DOI: 10.1039/d0nj00942c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A series of iminopyridyl ligand-based iron and cobalt complexes are utilized as catalysts in isoprene polymerization, in which the microstructure of resultant polyisoprenes was investigated.
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Affiliation(s)
- Wenhua Lin
- School of Textiles and Clothing
- Jiangnan University
- Wuxi
- China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
| | - Liping Zhang
- School of Textiles and Clothing
- Jiangnan University
- Wuxi
- China
| | - Hongyi Suo
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Arumugam Vignesh
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Nighat Yousuf
- CAS Research/Education Center for Excellence in Molecular Sciences
- University of Chinese Academy of Sciences
- Beijing 100049
- China
| | - Xiang Hao
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
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14
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Hashmi OH, Champouret Y, Visseaux M. Highly Active Iminopyridyl Iron-Based Catalysts for the Polymerization of Isoprene. Molecules 2019; 24:molecules24173024. [PMID: 31438501 PMCID: PMC6749290 DOI: 10.3390/molecules24173024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 07/28/2019] [Accepted: 08/07/2019] [Indexed: 11/17/2022] Open
Abstract
A series of iminopyridyl-based ligands, 6-[(Ar)N=C(R)]-2-C6H5N [(Ar = 2,6-Me2-C6H3, R = Me (L1); Ar = 2,6-iPr2-C6H3, R = Me (L2); Ar = 2,6-Me2-C6H3, R = H (L3); Ar = 2,6-iPr2-C6H3, R = H (L4); Ar = 3,5-(CF3)2-C6H3, R = Me (L5); Ar = C6F5, R = Me (L6)], and their corresponding iron (II) complexes were developed to investigate their application in the controlled coordinative polymerization of isoprene. The modulation of steric and electronic properties within this family of ligands/pre-catalysts has shown to influence the stereo-selectivity and activity of the polymerization of isoprene after activation. Upon activation with various co-catalysts such as AliBu3/[Ph3C][B(C6F5)4], AlEt3/[Ph3C][B(C6F5)4] or MAO, the resulting catalysts produced polyisoprenes with an excellent conversion (>99% of 500–5000 equiv.) within less than 1 h (TOF > 500 h−1) and having a variety of stereo-/regio-regularities. The presence of electron-donating and withdrawing groups drastically impacted the activity and the stereoselectivity of the catalysts during the course of the polymerization of isoprene. When activated with AliBu3/[Ph3C][B(C6F5)4], the complexes {6-[(2,6-Me2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C1) and {6-[(2,6-iPr2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C2) exhibited moderate trans-1,4 selectivity (>67%) while the iron-based systems bearing related aldiminopyridyl ligands {6-[(2,6-Me2-C6H3)N=C(H)]-2-C6H5N}FeCl2 (C3) and {6-[(2,6-iPr2-C6H3)N=C(H)]-2-C6H5N}FeCl2 (C4) were found to afford significant cis-1,4 selectivity at low temperature (>86% at −40 °C). On the other hand, the ternary {6-[(3,5-(CF3)2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C5) or {6-[(C6F5)N=C(Me)]-2-C6H5N}FeCl2 (C6)/AliBu3/[Ph3C][B(C6F5)4] catalytic combinations showed exceptional activity for the polymerization of isoprene (TOF > 1,000,000 h−1), albeit providing less stereoselectivity.
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Affiliation(s)
- Obaid H Hashmi
- UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, ENSCL, Centrale Lille, University of Artois, University of Lille, CNRS, F-59000 Lille, France
| | - Yohan Champouret
- UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, ENSCL, Centrale Lille, University of Artois, University of Lille, CNRS, F-59000 Lille, France.
| | - Marc Visseaux
- UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, ENSCL, Centrale Lille, University of Artois, University of Lille, CNRS, F-59000 Lille, France.
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15
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Zhao M, Mahmood Q, Jing C, Wang L, Zhu G, Zhang X, Wang Q. Isoprene Polymerization: Catalytic Performance of Iminopyridine Vanadium(III) Chloride versus Vanadium(III) Chloride. Polymers (Basel) 2019; 11:polym11071122. [PMID: 31269642 PMCID: PMC6681085 DOI: 10.3390/polym11071122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/07/2019] [Accepted: 06/18/2019] [Indexed: 01/23/2023] Open
Abstract
A series of vanadium complexes bearing iminopyridine bidentate ligands with various electronic and steric properties: V1 [CH2Ph], V2 [CMe2CH2CMe3], V3 [Ph] and V4 [2,6-iPr2Ph] were prepared and characterized by IR spectroscopy and microanalytical analysis. The catalytic capacity of all the complexes has been investigated for isoprene polymerization and was controlled by tuning the ligand structure with different N-alkyl and N-aryl groups. Activated by methylaluminoxane (MAO), the aryl-substituted complex V3 [Ph] exhibited high cis-1,4 selectivity (75%), and the resultant polymers had high molecular weights (Mn = 6.6 × 104) and narrow molecular weight distributions (PDI = 2.3). This catalyst showed high activity up to 734.4 kg polymer (mol V)−1 h−1 with excellent thermostability even stable at 70 °C. Compared to the traditional VCl3/MAO catalytic system, iminopyridine-supported V(III) catalysts displayed higher catalytic activities and changed the selectivity of monomer enchainment from trans-1,4 to cis-1,4.
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Affiliation(s)
- Mengmeng Zhao
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
| | - Chuyang Jing
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Liang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266000, China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
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16
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Jing C, Wang L, Mahmood Q, Zhao M, Zhu G, Zhang X, Wang X, Wang Q. Synthesis and characterization of aminopyridine iron(ii) chloride catalysts for isoprene polymerization: sterically controlled monomer enchainment. Dalton Trans 2019; 48:7862-7874. [DOI: 10.1039/c9dt00452a] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Aminopyridine iron(ii) chloride complexes coordinating a type of flexible ligand are reported as precursors for controlled polymerization of isoprenes.
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Affiliation(s)
- Chuyang Jing
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Liang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qaiser Mahmood
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Mengmeng Zhao
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Guangqian Zhu
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Xianhui Zhang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Xiaowu Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
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