151
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Kremer AB, Mehrkhodavandi P. Dinuclear catalysts for the ring opening polymerization of lactide. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.008] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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152
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Cai Z, Xiao D, Do LH. Cooperative Heterobimetallic Catalysts in Coordination Insertion Polymerization. COMMENT INORG CHEM 2019. [DOI: 10.1080/02603594.2019.1570165] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Zhongzheng Cai
- Department of Chemistry, University of Houston, Houston, Texas, USA
| | - Dawei Xiao
- Department of Chemistry, University of Houston, Houston, Texas, USA
| | - Loi H. Do
- Department of Chemistry, University of Houston, Houston, Texas, USA
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153
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Yang W, Ma Z, Yi J, Ahmed S, Sun WH. Catalytic performance of bis(imino)pyridine Fe/Co complexes toward ethylene polymerization by 2D-/3D-QSPR modeling. J Comput Chem 2019; 40:1374-1386. [PMID: 30697785 DOI: 10.1002/jcc.25792] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/08/2019] [Accepted: 01/11/2019] [Indexed: 01/23/2023]
Abstract
The two-dimensional and three-dimensional quantitative structure-property relationship (2D- and 3D-QSPR) approaches are applied to investigate the catalytic performance for a total data set of 55 bis(imino)pryridine iron and cobalt complexes, including the catalytic activity, molecular weight, and melting temperature of the product. The obtained models for the catalytic performance of interest exhibit good results by both 2D- and 3D-QSPR modeling, meanwhile higher predictive and validation powers observed in the 3D type. The modeling results indicate that the bulky substituents on ortho-position of the singular side phenyl ring and positive charge on para-position of the phenyl ring within the ligand are favorable to catalytic activity, while unfavorable to the molecular weight of product. Based on the obtained QSPR models, four new complexes are designed and predicted with good catalytic activity and very high molecular weight, which are in good agreement with our recent experimental report. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Wenhong Yang
- 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
| | - Zhifeng Ma
- Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Jun Yi
- Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Sadia Ahmed
- 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
| | - 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.,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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154
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Yu X, Li M, Hong J, Zhou X, Zhang L. Living 3,4‐(Co)Polymerization of Isoprene/Myrcene and One‐Pot Synthesis of a Polyisoprene Blend Catalyzed by Binuclear Rare‐Earth Metal Amidinate Complexes. Chemistry 2019; 25:2569-2576. [PMID: 30537360 DOI: 10.1002/chem.201804944] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 11/23/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Xiaying Yu
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
| | - Meng Li
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
| | - Jianquan Hong
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
| | - Xigeng Zhou
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
- State Key Laboratory of Organometallic Chemistry Shanghai 200032 China
| | - Lixin Zhang
- Department of ChemistryShanghai Key Laboratory of, Molecular Catalysis and Innovative MaterialsFudan University Shanghai 200438 China
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155
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Wu X, Zhang P, Yang Z, Zhang S, Liu H, Chi W, Li X, Dong Y, Qiu N, Yan L. Polymerization of phenylacetylenes by binuclear rhodium catalysts with different para-binucleating phenoxyiminato linkages. Polym Chem 2019. [DOI: 10.1039/c9py00594c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A binuclear rhodium catalyst 3b with a 2,5-phenyloxydiiminato linkage and an nbd ligand exhibits cooperative effects in terms of enhanced catalytic activity in the polymerization of phenylacetylene and its functional derivatives.
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156
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Wang F, Chen C. A continuing legend: the Brookhart-type α-diimine nickel and palladium catalysts. Polym Chem 2019. [DOI: 10.1039/c9py00226j] [Citation(s) in RCA: 186] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Here we will summarize some of the recent advances in α-diimine ligand developments, as well as some new and challenging monomers that this class of catalysts can address through these ligand improvements.
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Affiliation(s)
- Fuzhou Wang
- Institute of Physical Science and Information Technology
- Anhui University
- Hefei 230601
- Anhui
- China
| | - Changle Chen
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei 230026
- China
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157
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Mandal M, Ramkumar V, Chakraborty D. Salen complexes of zirconium and hafnium: synthesis, structural characterization and polymerization studies. Polym Chem 2019. [DOI: 10.1039/c8py01750f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Salen complexes of zirconium and hafnium were synthesized and used as effective catalysts for the polymerization of lactide and ε-CL and homopolymerization, copolymerization and coupling of epoxides with CO2.
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Affiliation(s)
- Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | | | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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158
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Xu R, Hua L, Li X, Yao Y, Leng X, Chen Y. Rare-earth/zinc heterometallic complexes containing both alkoxy-amino-bis(phenolato) and chiral salen ligands: synthesis and catalytic application for copolymerization of CO2 with cyclohexene oxide. Dalton Trans 2019; 48:10565-10573. [DOI: 10.1039/c9dt00064j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Ten rare-earth/zinc heterometallic complexes were synthesized and their catalytic application for copolymerization of CO2 with cyclohexene oxide was explored.
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Affiliation(s)
- Ruoyu Xu
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P. R. China
| | - Linyan Hua
- Key Laboratory of Organic Synthesis of Jiangsu Province and State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Xiang Li
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P. R. China
| | - Yingming Yao
- Key Laboratory of Organic Synthesis of Jiangsu Province and State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Xuebing Leng
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P. R. China
| | - Yaofeng Chen
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P. R. China
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159
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Ma X, Hu X, Zhang Y, Mu H, Cui L, Jian Z. Preparation and in situ chain-end-functionalization of branched ethylene oligomers by monosubstituted α-diimine nickel catalysts. Polym Chem 2019. [DOI: 10.1039/c9py00433e] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chain-end-functionalization of (highly) branched ethylene oligomers was achieved in situ with the most/least bulky α-diimine nickel catalysts for the first time.
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Affiliation(s)
- Xin Ma
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xiaoqiang Hu
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Yixin Zhang
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Hongliang Mu
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Lei Cui
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Zhongbao Jian
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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160
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Chen Q, Suo H, Zhang W, Zhang R, Solan GA, Liang T, Sun WH. 1,5-Naphthyl-linked bis(imino)pyridines as binucleating scaffolds for dicobalt ethylene oligo-/polymerization catalysts: exploring temperature and steric effects. Dalton Trans 2019; 48:8264-8278. [DOI: 10.1039/c9dt01235d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The title dinuclear Co complexes showed high activity for ethylene oligo-/polymerization with the run temperature having an unexpected effect on the PE to oligomer ratio.
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Affiliation(s)
- Qiang Chen
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Hongyi Suo
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wenjuan Zhang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Randi Zhang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Gregory A. Solan
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Tongling Liang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
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161
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Günnaz S, Gökçe AG, Türkmen H. Synthesis of bimetallic complexes bridged by 2,6-bis(benzimidazol-2-yl) pyridine derivatives and their catalytic properties in transfer hydrogenation. Dalton Trans 2018; 47:17317-17328. [PMID: 30475380 DOI: 10.1039/c8dt03178a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A series of binuclear rhodium(i) and iridium(i) complexes with 2,6-bis(benzimidazol-2-yl) pyridine (bzimpy) derivatives were synthesized and characterized by elemental analysis and spectroscopic methods. The molecular and crystal structures of complex 3d were determined by the single crystal X-ray diffraction technique. Their monometallic analogues were prepared to compare the catalytic properties of the bimetallic complexes. To determine the catalyst properties that result in a cooperative, bimetallic enhancement of the reaction rate, the systematic variation of the intermetallic distance and the ligand donor properties of the bimetallic complexes were explored based on the transfer hydrogenation reactions of ketones.
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Affiliation(s)
- Salih Günnaz
- Ege University, Department of Chemistry, 35100 Izmir, Turkey.
| | | | - Hayati Türkmen
- Ege University, Department of Chemistry, 35100 Izmir, Turkey.
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162
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Diehl CJ, Scattolin T, Englert U, Schoenebeck F. C−I-Selective Cross-Coupling Enabled by a Cationic Palladium Trimer. Angew Chem Int Ed Engl 2018; 58:211-215. [DOI: 10.1002/anie.201811380] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Claudia J. Diehl
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Thomas Scattolin
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Ulli Englert
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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163
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Binuclear and Hexanuclear Ti(IV) Complexes Supported by [OOOO]4–-type Ligand for Preparing Disentangled UHMWPE. CHINESE JOURNAL OF POLYMER SCIENCE 2018. [DOI: 10.1007/s10118-019-2197-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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164
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Diehl CJ, Scattolin T, Englert U, Schoenebeck F. C−I-Selective Cross-Coupling Enabled by a Cationic Palladium Trimer. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811380] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Claudia J. Diehl
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Thomas Scattolin
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Ulli Englert
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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165
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Hiranoi Y, Nakano K. Copolymerization of epoxides with cyclic anhydrides catalyzed by dinuclear cobalt complexes. Beilstein J Org Chem 2018; 14:2779-2788. [PMID: 30498527 PMCID: PMC6244378 DOI: 10.3762/bjoc.14.255] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 10/16/2018] [Indexed: 12/12/2022] Open
Abstract
The alternating copolymerization of epoxides with cyclic anhydrides (CAs) is a highly diverse synthetic method for polyesters as the polymers’ architectures and properties can be easily controlled depending on the combination of two monomers. Thus, a variety of catalyst designs has been reported to prepare the desired copolymers efficiently. We herein report dinuclear cobalt–salen complexes with a benzene ring as a linker and their activities in copolymerization reactions. The dinuclear cobalt complexes showed a higher catalytic activity for the copolymerization of propylene oxide with phthalic anhydride than the corresponding mononuclear cobalt–salen complex and achieved one of the highest turnover frequencies ever reported. A variety of epoxides and CAs were also found to be copolymerized successfully by the dinuclear cobalt complex with a high catalytic activity.
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Affiliation(s)
- Yo Hiranoi
- Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Koji Nakano
- Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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166
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Trinuclear tris(ansa-metallocene) complexes of zirconium and hafnium for olefin polymerization. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.09.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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167
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Cheng H, Wang H, Li Y, Hu Y, Zhang X, Cai Z. Structurally simple dinuclear nickel catalyzed olefin copolymerization with polar monomers. J Catal 2018. [DOI: 10.1016/j.jcat.2018.10.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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168
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Deacy AC, Durr CB, Garden JA, White AJP, Williams CK. Groups 1, 2 and Zn(II) Heterodinuclear Catalysts for Epoxide/CO2 Ring-Opening Copolymerization. Inorg Chem 2018; 57:15575-15583. [DOI: 10.1021/acs.inorgchem.8b02923] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Arron C. Deacy
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Christopher B. Durr
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Jennifer A. Garden
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Charlotte K. Williams
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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169
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Aluminates with Fluorinated Schiff Bases: Influence of the Alkali Metal⁻Fluorine Interactions in Structure Stabilization. MOLECULES (BASEL, SWITZERLAND) 2018; 23:molecules23123108. [PMID: 30486480 PMCID: PMC6321257 DOI: 10.3390/molecules23123108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 11/22/2018] [Accepted: 11/23/2018] [Indexed: 11/16/2022]
Abstract
New heterometallic aluminium-alkali metal compounds have been prepared using Schiff bases with electron withdrawing substituents as ligands. The synthesis of these new species was achieved via the reaction of AlMe₃ with the freshly prepared alkali-metallated ligand. The derivatives formed were characterized by NMR in solution and by single crystal X-ray diffraction in the solid state. Aluminate derivatives with lithium and sodium were prepared and a clear influence of the alkali metal in the final outcome is observed. The presence of a Na···F interaction in the solid state has a stabilization effect and the species [NaAlMe₃L]₂ can de isolated for the first time, which was not possible when using Schiff bases without electron withdrawing substituents as ligands.
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170
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TAKEUCHI D, TAKANO S, CHIBA Y, IWAMURA T, OSAKADA K. Polymerization and Copolymerization of Olefins by Double-Decker Type Dinuclear Metal Complex Catalysts. KOBUNSHI RONBUNSHU 2018. [DOI: 10.1295/koron.2018-0030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Daisuke TAKEUCHI
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology
- Department of Frontier Materials Chemistry, Faculty of Science and Technology, Hirosaki University
| | - Shigenaga TAKANO
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology
| | - Yuriko CHIBA
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology
| | - Takashi IWAMURA
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology
| | - Kohtaro OSAKADA
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology
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171
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Synthesis, APPI Mass-Spectrometric Characterization, and Polymerization Studies of Group 4 Dinuclear Bis(ansa-metallocene) Complexes. Catalysts 2018. [DOI: 10.3390/catal8110558] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
New ligand platforms of the type p- or m-Ph{-CR(3,6-tBu2Flu)(Cp)}2 (para-, R = Me (2a), H (2b); meta-, R = Me (2c)) were synthesized via nucleophilic addition of the 3,6-tBu2-fluorenyl-anion onto the parent phenylene-bridged difulvenes (1a–c). The corresponding discrete homodinuclear zirconium and hafnium bis(dichloro ansa-metallocene) complexes, Ph[{-CR(3,6-tBu2Flu)(Cp)}MCl2]2 (p-, R = Me (3a-Zr2, 3a-Hf2), R = H (3b-Zr2); m-, R = Me (3c-Zr2), were prepared by salt metathesis reactions. An attempt to generate in situ a heterodinuclear complex 3a-Zr-Hf was also undertaken. For the first time, Atmospheric Pressure PhotoIonization (APPI) mass-spectrometric data were obtained for all dinuclear compounds and found to be in excellent agreement with the simulated ones. Preliminary studies on the catalytic performances of these dinuclear complexes, upon activation with MAO, in ethylene homopolymerization and ethylene/1-hexene copolymerization revealed a few differences as compared to those of the monometallic analogues. In particular, slightly lower molecular weights and a greater formation of short methyl and ethyl branches were obtained with the dinuclear systems.
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172
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Chen Q, Zhang W, Solan GA, Zhang R, Guo L, Hao X, Sun WH. CH(phenol)-Bridged Bis(imino)pyridines as Compartmental Supports for Diiron Precatalysts for Ethylene Polymerization: Exploring Cooperative Effects on Performance. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00602] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Qiang Chen
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wenjuan Zhang
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
| | - Gregory A. Solan
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Randi Zhang
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Liwei Guo
- School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
| | - Xiang Hao
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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173
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Shaw TE, Shultz LR, Garayeva LR, Blair RG, Noll BC, Jurca T. Mechanochemical routes for the synthesis of acetyl- and bis-(imino)pyridine ligands and organometallics. Dalton Trans 2018; 47:16876-16884. [PMID: 30351333 DOI: 10.1039/c8dt03608j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Organometallic precatalysts play a pivotal role in organic synthesis. However, their preparation often relies on multiple time, energy, and solvent intensive steps, including the synthesis of supporting organic ligand structures, and finally installation on the desired metal centres. We report the sustainable mechanochemical synthesis of acetyl- and bis-(imino)pyridine pincer complexes, a ubiquitous ligand class for organometallic precatalysts. The approach is extended to the one-pot synthesis of acetyl(imino)pyridine-CoCl2, where the ligand is formed in situ.
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Affiliation(s)
- Thomas E Shaw
- Department of Chemistry and the Energy Conversion and Propulsion Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA.
| | - Lorianne R Shultz
- Department of Chemistry and the Energy Conversion and Propulsion Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA.
| | - Louiza R Garayeva
- Department of Chemistry and the Energy Conversion and Propulsion Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA.
| | - Richard G Blair
- Florida Space Institute, University of Central Florida, 12354 Research Parkway, Suite 214, Orlando, FL 32826, USA
| | - Bruce C Noll
- Bruker AXS Inc., 5465 East Cheryl Parkway, Madison, WI 53711, USA
| | - Titel Jurca
- Department of Chemistry and the Energy Conversion and Propulsion Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA.
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174
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Bhattacharjee J, Harinath A, Banerjee I, Nayek HP, Panda TK. Highly Active Dinuclear Titanium(IV) Complexes for the Catalytic Formation of a Carbon-Heteroatom Bond. Inorg Chem 2018; 57:12610-12623. [PMID: 30259733 DOI: 10.1021/acs.inorgchem.8b01766] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of mononuclear titanium(IV) complexes with the general composition κ3-[R{NHPh2P(X)}2Ti(NMe2)2] [R = C6H4, X = Se (3b); R = trans-C6H10, X = S (4a), Se (4b)] and [{κ2-N(PPh2Se)2}2Ti(NMe2)2] (6b) and two dinuclear titanium(IV) complexes, [C6H4{(NPh2PS)(N)}Ti(NMe2)]2 (3c) and [{κ2-N(PPh2Se)}Ti(NMe2)2]2 (6c), are reported. Dinuclear titanium(IV) complex 6c acts as an efficient catalyst for the chemoselective addition of an E-H bond (E = N, O, S, P, C) to heterocumulenes under mild conditions. The catalytic addition of aliphatic and aromatic amines, alcohol, thiol, phosphine oxide, and acetylene to the carbodiimides afforded the corresponding hydroelemented products in high yield at mild conditions with a broader substrate scope. The catalytic efficiency of the dinuclear complex depends on the cooperative effect of the TiIV ions, the systematic variation of the intermetallic distance, and the ligand's steric properties of the complex, which enhances the reaction rate. Most interestingly, this is the first example of catalytic insertion of various E-H bonds into the carbodiimides using a single-site catalyst because only the titanium-mediated insertion of E-H into a C═N unsaturated bond is reported to date. The amine and alcohol insertion reaction with the carbodiimides showed first-order kinetics with respect to the titanium(IV) catalyst as well as substrates. A most plausible mechanism for hydroelementation reaction is also proposed, based on the spectroscopic data of the controlled reaction, a time-course study, and the Hammett plot.
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Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry , Indian Institute of Technology Hyderabad Kandi , Sangareddy , Telangana 502 285 , India
| | - Adimulam Harinath
- Department of Chemistry , Indian Institute of Technology Hyderabad Kandi , Sangareddy , Telangana 502 285 , India
| | - Indrani Banerjee
- Department of Chemistry , Indian Institute of Technology Hyderabad Kandi , Sangareddy , Telangana 502 285 , India
| | - Hari Pada Nayek
- Department of Applied Chemistry , Indian Institute of Technology Dhanbad , Dhanbad , Jharkhand 826004 , India
| | - Tarun K Panda
- Department of Chemistry , Indian Institute of Technology Hyderabad Kandi , Sangareddy , Telangana 502 285 , India
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175
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Li C, Tang H, Fang Y, Xiao Z, Wang K, Wu X, Niu H, Zhu C, Zhou HC. Bottom-Up Assembly of a Highly Efficient Metal-Organic Framework for Cooperative Catalysis. Inorg Chem 2018; 57:13912-13919. [PMID: 30299095 DOI: 10.1021/acs.inorgchem.8b02434] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this study, we demonstrate a bottom-up assembly of a monomeric copper complex and a two-dimensional (2-D) heterometallic metal-organic framework (MOF) from a carboxylate-functionalized tridentate Schiff base ligand and metal ions. The obtained 2-D MOF features a unique bimetallic copper center which is different from its monometallic precursor and acts as an efficient heterogeneous catalyst for the Friedel-Crafts reaction and Henry reaction. The MOF catalyst shows a remarkably superior activity compared to its homogeneous counterparts in a wide range of substrates. It is presumably ascribed to the dual activation of the substrates by the active bimetallic copper center confined in the MOF network, which is supported by the significant changes in catalytic activity at low catalyst/substrates ratios when using the 2-D MOF and its precursor as catalysts, respectively. Moreover, the MOF catalyst also shows an excellent stability and recyclability. Our work, therefore, provides a stepwise strategy to design a heterogeneous cooperative catalyst, by taking advantage of the modulated structure of MOF and tunable functionality of the tridentate Schiff base, with high performance in a variety of organic synthesis.
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Affiliation(s)
- Changda Li
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei , 230009 , P. R. China
| | - Haitong Tang
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei , 230009 , P. R. China
| | - Yu Fang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Zhifeng Xiao
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Kunyu Wang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Xiang Wu
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei , 230009 , P. R. China
| | - Helin Niu
- School of Chemistry and Chemical Engineering , Anhui University , Hefei , 230039 , P. R. China
| | - Chengfeng Zhu
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei , 230009 , P. R. China
| | - Hong-Cai Zhou
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States.,Department of Materials Science and Engineering , Texas A&M University , College Station , Texas 77843-3003 , United States
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176
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Cai Z, Do LH. Thermally Robust Heterobimetallic Palladium–Alkali Catalysts for Ethylene and Alkyl Acrylate Copolymerization. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00561] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zhongzheng Cai
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Loi H. Do
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
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177
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Suo H, Solan GA, Ma Y, Sun WH. Developments in compartmentalized bimetallic transition metal ethylene polymerization catalysts. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.06.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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178
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Shitaya S, Nomura K, Inagaki A. Synthesis of di- and trinuclear iridium polyhydride complexes surrounded by light-absorbing ligands. Dalton Trans 2018; 47:12046-12050. [PMID: 29872816 DOI: 10.1039/c8dt00998h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New di- and trinuclear iridium (Ir) penta- and hexahydride complexes containing light-absorbing diphosphine ligands have been developed. The trinuclear Ir complex possessed a higher absorption coefficient (standardized per Ir) than that of the parent mononuclear Ir complex, indicating the assembly effect. The trinuclear complex showed high reactivity toward catalytic hydrogenation of diphenylacetylene under mild conditions, and the reaction was considerably accelerated under photoirradiation.
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Affiliation(s)
- Shoji Shitaya
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan.
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179
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Xiao D, Do LH. In Situ Generated Heterometallic Nickel–Zinc Catalysts for Ethylene Polymerization. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00454] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dawei Xiao
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Loi H. Do
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
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180
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Langeslay RR, Sohn H, Hu B, Mohar JS, Ferrandon M, Liu C, Kim H, Jeremy Kropf A, Yang C, Niklas J, Poluektov OG, Ercan Alp E, Ignacio-de Leon P, Sattelberger AP, Hock AS, Delferro M. Nuclearity effects in supported, single-site Fe(ii) hydrogenation pre-catalysts. Dalton Trans 2018; 47:10842-10846. [PMID: 30015817 DOI: 10.1039/c8dt02720j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dimeric and monomeric supported single-site Fe(ii) pre-catalysts on SiO2 have been prepared via organometallic grafting and characterized with advanced spectroscopic techniques. Manipulation of the surface hydroxyl concentration on the support influences monomer/dimer formation. While both pre-catalysts are highly active in liquid-phase hydrogenation, the dimeric pre-catalyst is ∼3× faster than the monomer. Preliminary XAS experiments on the H2-activated samples suggest the active species are isolated Fe(ii) sites.
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Affiliation(s)
- Ryan R Langeslay
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.
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181
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Krull C, Castelli M, Hapala P, Kumar D, Tadich A, Capsoni M, Edmonds MT, Hellerstedt J, Burke SA, Jelinek P, Schiffrin A. Iron-based trinuclear metal-organic nanostructures on a surface with local charge accumulation. Nat Commun 2018; 9:3211. [PMID: 30097562 PMCID: PMC6086834 DOI: 10.1038/s41467-018-05543-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 07/13/2018] [Indexed: 12/02/2022] Open
Abstract
Coordination chemistry relies on harnessing active metal sites within organic matrices. Polynuclear complexes-where organic ligands bind to several metal atoms-are relevant due to their electronic/magnetic properties and potential for functional reactivity pathways. However, their synthesis remains challenging; few geometries and configurations have been achieved. Here, we synthesise-via supramolecular chemistry on a noble metal surface-one-dimensional metal-organic nanostructures composed of terpyridine (tpy)-based molecules coordinated with well-defined polynuclear iron clusters. Combining low-temperature scanning probe microscopy and density functional theory, we demonstrate that the coordination motif consists of coplanar tpy's linked via a quasi-linear tri-iron node in a mixed (positive-)valence metal-metal bond configuration. This unusual linkage is stabilised by local accumulation of electrons between cations, ligand and surface. The latter, enabled by bottom-up on-surface synthesis, yields an electronic structure that hints at a chemically active polynuclear metal centre, paving the way for nanomaterials with novel catalytic/magnetic functionalities.
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Affiliation(s)
- Cornelius Krull
- School of Physics & Astronomy, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
| | - Marina Castelli
- School of Physics & Astronomy, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
- Monash Centre for Atomically Thin Materials, Monash University, 20 Research Way, Clayton, 3800, Australia
| | - Prokop Hapala
- Institute of Physics of the CAS, Cukrovarnicka 10, Prague, 16200, Czech Republic
| | - Dhaneesh Kumar
- School of Physics & Astronomy, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
- Monash Centre for Atomically Thin Materials, Monash University, 20 Research Way, Clayton, 3800, Australia
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
| | - Anton Tadich
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, 3168, Australia
| | - Martina Capsoni
- Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, Canada, V6T 1Z1
| | - Mark T Edmonds
- School of Physics & Astronomy, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
- Monash Centre for Atomically Thin Materials, Monash University, 20 Research Way, Clayton, 3800, Australia
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
| | - Jack Hellerstedt
- School of Physics & Astronomy, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia
- Monash Centre for Atomically Thin Materials, Monash University, 20 Research Way, Clayton, 3800, Australia
- Institute of Physics of the CAS, Cukrovarnicka 10, Prague, 16200, Czech Republic
| | - Sarah A Burke
- Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, Canada, V6T 1Z1
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada, V6T 1Z1
- Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, British Columbia, Canada, V6T 1Z4
| | - Pavel Jelinek
- Institute of Physics of the CAS, Cukrovarnicka 10, Prague, 16200, Czech Republic.
- RCPTM, Palacky University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic.
| | - Agustin Schiffrin
- School of Physics & Astronomy, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia.
- Monash Centre for Atomically Thin Materials, Monash University, 20 Research Way, Clayton, 3800, Australia.
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, 19 Rainforest Walk, Clayton, 3800, Australia.
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182
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Invergo AM, Liu S, Dicken RD, Mouat AR, Delferro M, Lohr TL, Marks TJ. How Close Is Too Close? Polymerization Behavior and Monomer-Dependent Reorganization of a Bimetallic Salphen Organotitanium Catalyst. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00220] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Anna M. Invergo
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Shaofeng Liu
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Rachel D. Dicken
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Aidan R. Mouat
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Massimiliano Delferro
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Tracy L. Lohr
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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183
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Takeuchi D, Iwasawa T, Osakada K. Double-Decker-Type Dipalladium Catalysts for Copolymerization of Ethylene with Acrylic Anhydride. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00569] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Daisuke Takeuchi
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, R1-04, 4259 Nagatsuta, Yokohama 226-8503, Japan
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Takashi Iwasawa
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, R1-04, 4259 Nagatsuta, Yokohama 226-8503, Japan
| | - Kohtaro Osakada
- Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, R1-04, 4259 Nagatsuta, Yokohama 226-8503, Japan
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184
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Mahmood Q, Sun WH. N, N-chelated nickel catalysts for highly branched polyolefin elastomers: a survey. ROYAL SOCIETY OPEN SCIENCE 2018; 5:180367. [PMID: 30109091 PMCID: PMC6083730 DOI: 10.1098/rsos.180367] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 06/27/2018] [Indexed: 06/08/2023]
Abstract
The physical properties and end applications of polyolefin materials are defined by their chain architectures and topologies. These properties can, in part, be controlled by a judicious choice of the steric and electronic properties of the catalyst and, in particular, the ligand framework. One major achievement in this field is the discovery of thermoplastic polyolefin elastomers that combine the processing and recyclable characteristics of thermoplastics with the flexibility and ductility of elastomers. These polymers are highly sought after as alternative materials to thermoset elastomers. In this perspective, works in the literature related to the development of nickel catalysts as well as their implementations for the synthesis of polyolefin elastomers are summarized in detail. Throughout the perspective, attention has been focused on developing the relationship between catalyst structure and performance, on strategies for the synthesis of polyolefin elastomer using nickel catalysts, on properties of the resultant polyolefin, such as degree of branching and crystallinity, as well as on their effects on mechanical properties. The future perspective regarding the most recent developments in single-step production of polyethylene elastomers will also be presented.
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Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of 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, People's Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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185
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Sung S, Ang A, Hill AF, Ma C, Kong RY, Ward JS, Young RD. Bimetallic Complexes of Group 8, 9, and 11 Metals Bridged by RB(NCH
2
PPh
2
)
2
C
6
H
4
(R = H, 4‐C
6
H
4
X; X = H, Me, F) Ligands. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Simon Sung
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| | - Angelina Ang
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| | - Anthony F. Hill
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Chenxi Ma
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Richard Y. Kong
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Jas S. Ward
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Rowan D. Young
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
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186
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NMR chemical shift analysis decodes olefin oligo- and polymerization activity of d 0 group 4 metal complexes. Proc Natl Acad Sci U S A 2018; 115:E5867-E5876. [PMID: 29891699 DOI: 10.1073/pnas.1803382115] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
d0 metal-alkyl complexes (M = Ti, Zr, and Hf) show specific activity and selectivity in olefin polymerization and oligomerization depending on their ligand set and charge. Here, we show by a combined experimental and computational study that the 13C NMR chemical shift tensors of the α-carbon of metal alkyls that undergo olefin insertion signal the presence of partial alkylidene character in the metal-carbon bond, which facilitates this reaction. The alkylidene character is traced back to the π-donating interaction of a filled orbital on the alkyl group with an empty low-lying metal d-orbital of appropriate symmetry. This molecular orbital picture establishes a connection between olefin insertion into a metal-alkyl bond and olefin metathesis and a close link between the Cossee-Arlmann and Green-Rooney polymerization mechanisms. The 13C NMR chemical shifts, the α-H agostic interaction, and the low activation barrier of ethylene insertion are, therefore, the results of the same orbital interactions, thus establishing chemical shift tensors as a descriptor for olefin insertion.
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187
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Alvarez MA, Casado-Ruano M, García ME, García-Vivó D, Ruiz MA. Dehydrogenation, Methyl Elimination and Insertion Reactions of the Agostic Methyl-Bridged Complex [Mo2
Cp2
(μ-κ1
:η2
-CH3
)(μ-Pt
Bu2
)(μ-CO)]. Chemistry 2018; 24:9504-9507. [DOI: 10.1002/chem.201801944] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Indexed: 11/08/2022]
Affiliation(s)
- M. Angeles Alvarez
- Departamento de Química Orgánica e Inorgánica/IUQOEM; Universidad de Oviedo; E-33071 Oviedo Spain
| | - Melodie Casado-Ruano
- Departamento de Química Orgánica e Inorgánica/IUQOEM; Universidad de Oviedo; E-33071 Oviedo Spain
| | - M. Esther García
- Departamento de Química Orgánica e Inorgánica/IUQOEM; Universidad de Oviedo; E-33071 Oviedo Spain
| | - Daniel García-Vivó
- Departamento de Química Orgánica e Inorgánica/IUQOEM; Universidad de Oviedo; E-33071 Oviedo Spain
| | - Miguel A. Ruiz
- Departamento de Química Orgánica e Inorgánica/IUQOEM; Universidad de Oviedo; E-33071 Oviedo Spain
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188
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Banerjee S, Vanka K. B(C6F5)3: Catalyst or Initiator? Insights from Computational Studies into Surrogate Silicon Chemistry. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04489] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Subhrashis Banerjee
- Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India
| | - Kumar Vanka
- Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, Maharashtra, India
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189
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Chen X, Zeng Y, Lan Z, You Q, Li T, Li X, Zhang D, Xie G. A Methylene-bridged salicylaldiminato tridentate [ONS] binuclear titanium complex for ethylene-norbornene copolymerization. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2018. [DOI: 10.1080/10601325.2018.1470467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Xiong Chen
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Yi Zeng
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Zhi Lan
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Qingliang You
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan, China
| | - Tingcheng Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Xiangdan Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Daohong Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
| | - Guangyong Xie
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan, China
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190
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Guo J, Lu Y, Zhao R, Liu Z, Menberu W, Wang ZX. Strong Preference of the Redox-Neutral Mechanism over the Redox Mechanism for the Ti IV Catalysis Involved in the Carboamination of Alkyne with Alkene and Diazene. Chemistry 2018; 24:7010-7025. [PMID: 29709085 DOI: 10.1002/chem.201800339] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 03/01/2018] [Indexed: 02/01/2023]
Abstract
Titanium catalysis generally prefers redox-neutral mechanisms. Yet it has been reported that titanium could promote bond formations in a way similar to reductive elimination. Accordingly, redox catalytic cycles involving TiIV /TiII cycling have been considered. By studying, as an example, the carboamination of alkynes with alkenes and azobenzene catalyzed by the [TiIV ]=NPh imido complex, we performed DFT computations to gain an understanding of how the "abnormal" catalysis takes place, thereby allowing us to clarify whether the catalysis really follows TiIV /TiII redox mechanisms. The reaction first forms an azatitanacyclohexene by alkyne addition to the [TiIV ]=NPh bond, followed by alkene insertion. The azatitanacyclohexene can either undergo Cα -Cγ coupling, to afford bicyclo[3.1.0]imine, or β-H elimination, to yield a [TiIV ]-H hydride, which then undergoes Cα =Cβ or Cγ =Cδ insertion to give an α,β- or β,γ-unsaturated imine, respectively. Both the geometric and electronic structures indicate that the catalytic cycles proceed through redox-neutral mechanisms. The alternative redox mechanisms (e.g., by N-H or C-H reductive elimination) are substantially less favorable. We concluded that electronically, the TiIV catalysis intrinsically favors the redox-neutral mechanism, because a redox pathway would involve TiII structures either in the triplet ground state or in the high-lying open-shell singlet state, but the involvement of triplet TiII structures is spin-forbidden and that of singlet TiII structures is energetically disadvantageous.
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Affiliation(s)
- Jiandong Guo
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Yu Lu
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Ruihua Zhao
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Zheyuan Liu
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Wasihun Menberu
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Xiang Wang
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing, 100049, China
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191
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Taher D, Klaib S, Awwadi FF, Helal W, Gharaibeh M, Rheinwald G, Rüffer T, Lang H. Ti(ƞ5-1-SiMe3-C9H6)(Cl)2(OR): Structure and bonding. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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192
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Chen C. Designing catalysts for olefin polymerization and copolymerization: beyond electronic and steric tuning. Nat Rev Chem 2018. [DOI: 10.1038/s41570-018-0003-0] [Citation(s) in RCA: 345] [Impact Index Per Article: 57.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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193
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Dechal A, Khoshsefat M, Ahmadjo S, Mortazavi SMM, Zohuri GH, Abedini H. Mono‐ and binuclear nickel catalysts for 1‐hexene polymerization. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4355] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Abbas Dechal
- Department of Catalysis Iran Polymer and Petrochemical Institute (IPPI) PO Box 14965/115 Tehran Iran
| | - Mostafa Khoshsefat
- Department of Catalysis Iran Polymer and Petrochemical Institute (IPPI) PO Box 14965/115 Tehran Iran
- Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta Canada
| | - Saeid Ahmadjo
- Department of Catalysis Iran Polymer and Petrochemical Institute (IPPI) PO Box 14965/115 Tehran Iran
| | | | - Gholam Hossein Zohuri
- Department of Chemistry, Faculty of Science Ferdowsi University of Mashhad PO Box 91775 Mashhad Iran
| | - Hossein Abedini
- Polymerization Engineering Department Iran Polymer and Petrochemical Institute (IPPI) PO Box 14965/115 Tehran Iran
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194
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Gao Y, Chen X, Zhang J, Chen J, Lohr TL, Marks TJ. Catalyst Nuclearity Effects on Stereo- and Regioinduction in Pyridylamidohafnium-Catalyzed Propylene and 1-Octene Polymerizations. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00181] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Yanshan Gao
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Xia Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Jialong Zhang
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Jiazhen Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Tracy L. Lohr
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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195
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Mahmood Q, Guo J, Zhang W, Ma Y, Liang T, Sun WH. Concurrently Improving the Thermal Stability and Activity of Ferrous Precatalysts for the Production of Saturated/Unsaturated Polyethylene. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00909] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Jingjing Guo
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People’s Republic of China
| | - Wenjuan Zhang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People’s Republic of China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Tongling Liang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of 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, People’s Republic of China
- CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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196
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Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization. CHINESE JOURNAL OF POLYMER SCIENCE 2018. [DOI: 10.1007/s10118-018-2097-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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197
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Shen X, Gong H, Zhou Y, Zhao Y, Lin J, Chen M. Unsymmetrical difunctionalization of cyclooctadiene under continuous flow conditions: expanding the scope of ring opening metathesis polymerization. Chem Sci 2018; 9:1846-1853. [PMID: 29675230 PMCID: PMC5890785 DOI: 10.1039/c7sc04580h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 01/05/2018] [Indexed: 11/24/2022] Open
Abstract
Functionalized cyclooctenes (FCOEs) are important monomers in ring-opening metathesis polymerization (ROMP). Herein, a new library of disubstituted FCOEs bearing adjacent heteroatoms were synthesized and applied in ROMP. To address the issues associated with the handling of the reactive thienyl chloride intermediate, a two-step continuous flow method has been developed to prepare 5-thio-6-chlorocyclooctene compounds from abundant cyclooctadiene starting materials. These newly synthesized FCOE monomers were subsequently polymerized through ROMP, giving rise to a range of functionalized polymers with high molecular weights. Furthermore, we demonstrated that the thermal properties of these polymers could be fine-tuned by changing the functional groups in the FCOE monomers. We expect that this functionalization-polymerization strategy will enable the preparation of a range of polymeric materials with complex structures.
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Affiliation(s)
- Xianwang Shen
- State Key Laboratory of Molecular Engineering of Polymers , Department of Macromolecular Science , Fudan University , Shanghai 200433 , China . ; http://chenmaofudan.wixsite.com/polymao
- Key Laboratory of Medicinal Chemistry for Natural Resource , Ministry Education , School of Chemical Science and Technology , Yunnan University , Kunming , 650091 , China
| | - Honghong Gong
- State Key Laboratory of Molecular Engineering of Polymers , Department of Macromolecular Science , Fudan University , Shanghai 200433 , China . ; http://chenmaofudan.wixsite.com/polymao
| | - Yang Zhou
- State Key Laboratory of Molecular Engineering of Polymers , Department of Macromolecular Science , Fudan University , Shanghai 200433 , China . ; http://chenmaofudan.wixsite.com/polymao
| | - Yucheng Zhao
- State Key Laboratory of Molecular Engineering of Polymers , Department of Macromolecular Science , Fudan University , Shanghai 200433 , China . ; http://chenmaofudan.wixsite.com/polymao
- Key Laboratory of Medicinal Chemistry for Natural Resource , Ministry Education , School of Chemical Science and Technology , Yunnan University , Kunming , 650091 , China
| | - Jun Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource , Ministry Education , School of Chemical Science and Technology , Yunnan University , Kunming , 650091 , China
| | - Mao Chen
- State Key Laboratory of Molecular Engineering of Polymers , Department of Macromolecular Science , Fudan University , Shanghai 200433 , China . ; http://chenmaofudan.wixsite.com/polymao
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198
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Mahmood Q, Zeng Y, Wang X, Sun Y, Sun WH. Advancing polyethylene properties by incorporating NO 2 moiety in 1,2-bis(arylimino)acenaphthylnickel precatalysts: synthesis, characterization and ethylene polymerization. Dalton Trans 2018; 46:6934-6947. [PMID: 28504797 DOI: 10.1039/c7dt01295k] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A new family of nickel halides (bromides Ni1-Ni5 and chlorides Ni6-Ni10) ligated by 1-(2,6-dibenzhydryl-4-nitrophenylimino)-2-(arylimino)acenaphthylene (Aryl = 2,6-Me2C6H3L1, 2,6-Et2C6H3L2, 2,6-iPr2C6H3L3, 2,4,6-Me3C6H2L4, and 2,6-Et2-4-MeC6H2L5) have been prepared and well characterized, and the scope of their catalytic properties toward the polymerization of ethylene has been investigated. Upon activation with either Et2AlCl or EASC, the nickel bromide complexes displayed better activities than their nickel chloride counterparts and produced higher-molecular-weight polyethylene in the range of 106 g mol-1 with a very narrow range of molecular weight distributions. In comparison with reference precatalysts with non-nitro substituents (CH3, F or Cl), the title complexes experienced a modest negative effect on catalytic activity upon replacement with a NO2 moiety (activity up to 4.61 × 106 g PE (mol Ni)-1 h-1 at 20 °C). Conversely, the NO2 moiety exerted a positive effect to increase the molecular weight of the resulting polyethylene, and Ni4/Et2AlCl gave polyethylene with a maximum molecular weight of as high as 32.8 × 105 g mol-1, which is not only the highest among the title complexes but also higher than any literature values reported with 1,2-diiminoacenaphthylnickel halides.
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Affiliation(s)
- Qaiser Mahmood
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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199
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Garden JA, White AJP, Williams CK. Heterodinuclear titanium/zinc catalysis: synthesis, characterization and activity for CO 2/epoxide copolymerization and cyclic ester polymerization. Dalton Trans 2018; 46:2532-2541. [PMID: 28154848 DOI: 10.1039/c6dt04193k] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The preparation of heterodinuclear complexes, especially those comprising early-late transition metals coordinated by a simple or symmetrical ancillary ligand, represents a fundamental challenge and an opportunity to prepare catalysts benefitting from synergic properties. Here, two new mixed titanium(iv)-zinc(ii) complexes, [LTi(OiPr)2ZnEt] and [LTi(OiPr)2ZnPh], both coordinated by a diphenolate tetra(amine) macrocyclic ligand (L), are prepared. The synthesis benefits from the discovery that reaction of the ligand with a single equivalent of titanium tetrakis(iso-propoxide) allows the efficient formation of a mono-Ti(iv) complex, [LTi(OiPr)2]. All new complexes are characterized by a combination of single crystal X-ray diffraction, multinuclear NMR spectroscopy and mass spectrometry techniques. The two heterobimetallic complexes, [LTi(OiPr)2ZnEt] and [LTi(OiPr)2ZnPh], feature trianionic coordination by the macrocyclic ligand and bridging alkoxide groups coordinate to both the different metal centres. The heterodinuclear catalysts are compared to the mono-titanium analogue, [LTi(OiPr)2], in various polymerization reactions. In the alternating copolymerizations of carbon dioxide and cyclohexene oxide, the mono-titanium complex is totally inactive whilst the heterodinuclear complexes show moderate activity (TOF = 3 h-1); it should be noted the activity is measured using just 1 bar pressure of carbon dioxide. In the ring opening polymerization of lactide and ε-caprolactone, the mono-Ti(iv) complex is totally inactive whilst the heterodinuclear complexes show moderate-high activities, qualified by comparison to other known titanium polymerization catalysts (l-lactide, kobs = 11 × 10-4 s-1 at 70 °C, 1 M in [lactide]) and ε-caprolactone (kobs = 5 × 10-4 s-1 at 70 °C, 0.9 M in [ε-caprolactone]).
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Affiliation(s)
- Jennifer A Garden
- EastCHEM School of Chemistry, Joseph Black Building, University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, UK
| | - Andrew J P White
- Department of Chemistry, Imperial College London, London, SW7 2AZ, UK
| | - Charlotte K Williams
- Chemistry Research Laboratory, 12 Mansfield Road, University of Oxford, Oxford, OX1 3TA, UK.
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200
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Luo D, Zeng Y, Chen X, Xia P, Xie G, You Q, Zhang L, Li T, Li X, Zhang A. Synthesis, characterization and olefin polymerization behaviors of phenylene-bridged bis-β-carbonylenamine binuclear titanium complexes. RSC Adv 2018; 8:6954-6964. [PMID: 35540336 PMCID: PMC9078301 DOI: 10.1039/c8ra00071a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 02/06/2018] [Indexed: 12/19/2022] Open
Abstract
Binuclear and multinuclear complexes have attracted much attention due to their unique catalytic performances for olefin polymerization compared with their mononuclear counterparts. In this work, a series of phenyl-bridged bis-β-carbonylenamine [O−NSR] (R = alkyl or phenyl) tridentate ligands and their binuclear titanium complexes (Ti2L1–Ti2L5) were synthesized and characterized by 1H NMR, 13C NMR, FTIR and elemental analysis. The molecular structure of ligand L2 (R = nPr) and its corresponding Ti complex Ti2L2 were further investigated by single-crystal X-ray diffraction, which showed that each titanium coordinated with six atoms to form a distorted octahedral configuration along with the conversion of the ligand from β-carbonylenamine to β-imino enol form. Under the activation of MMAO, these complexes catalyzed ethylene polymerization and ethylene/α-olefin copolymerization with extremely high activity (over 106 g mol (Ti)−1 h−1 atm−1) to produce high molecular weight polyethylene. At the same time, wider polydispersity as compared with the mononuclear counterpart TiL6 was observed, indicating that two active catalytic centers may be present, consistent with the asymmetrical crystal structure of the binuclear titanium complex. Furthermore, these complexes possessed better thermal stability than their mononuclear analogues. Compared with the complexes bearing alkylthio sidearms, the complex Ti2L5 bearing a phenylthio sidearm exhibited higher catalytic activity towards ethylene polymerization and produced polyethylene with much higher molecular weight, but with an appreciably lower 1-hexene incorporation ratio. Nevertheless, these bis-β-carbonylenamine-derived binuclear titanium complexes showed much higher ethylene/1-hexene copolymerization activity and 1-hexene incorporation ratios as compared with the methylene-bridged bis-salicylaldiminato binuclear titanium complexes, and the molecular weight and 1-hexene incorporation ratio could be flexibly tuned by the initial feed of α-olefin commoners and catalyst structures. Phenyl-bridged bis-β-carbonylenamine binuclear titanium complexes were synthesized, characterized and used to catalyze ethylene (co)polymerization with extremely high activity.![]()
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Affiliation(s)
- Derong Luo
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Yi Zeng
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Xiong Chen
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Ping Xia
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Guangyong Xie
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Qingliang You
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University Wuhan 430056 China
| | - Li Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Tingcheng Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Xiangdan Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
| | - Aiqing Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission, Ministry of Education Hubei Province, South-Central University for Nationalities Wuhan 430074 China
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