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Xing Y, Xu L, Liu S, Li Z. Dinuclear Group 4 Metal Complexes Bearing Anthracene-Bridged Bifunctional Amido-Ether Ligands: Remarkable Metal Effect and Cooperativity toward Ethylene/1-Octene Copolymerization. Inorg Chem 2023; 62:2859-2869. [PMID: 36719090 DOI: 10.1021/acs.inorgchem.2c04211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Two types of bifunctional amido-ether ligands (syn-L and anti-L) with the rigid anthracene skeleton were designed to support dinuclear group 4 metal complexes. All organic ligands and organometallic complexes (syn-M2 and anti-M2; M = Hf, Zr, and Ti) were fully characterized by 1H and 13C NMR spectroscopies and elemental analyses. The anti-Hf2 complex showed two confirmations at room temperature with C2-symmetry or S2-symmetry that can inter-exchange, as indicated by VT NMR, while only a C2-symmetric isomer was observed for syn-Hf2 complex at room temperature. However, for Zr and Ti analogues, both syn and anti complexes exhibited only one conformation at room temperature. The molecular structures of complexes syn-Hf2, anti-Hf2, and syn-Ti2 in the solid state were further determined by single-crystal X-ray diffraction, revealing the distances between two metal centers in syn-M2 from 7.138 Å (syn-Ti2) to 7.321 Å (syn-Hf2) but a much farther separation in anti-M2 (8.807 Å in C2-symmetric anti-Hf2). The mononuclear complex (2-CH3O-C6H4-N-C14H9)Zr(NMe2)3 (mono-Zr1) was also prepared for control experiments. In the presence of alkyl aluminum (AlEt3) as the alkylating agent and trityl borate ([Ph3C][B(C6F5)4]) as the co-catalyst, all metal complexes were tested for copolymerization of ethylene with 1-octene at high temperature (130 °C). The preliminary polymerization results revealed that the activity was highly dependent upon the nature of metal centers, and syn-Zr2 showed the highest activity of 9600 kg(PE)·mol-1 (Zr)·h-1, which was about 17- and 2.2-fold higher than those of syn-Hf2 and syn-Ti2, respectively. Benefitting from both steric proximity and electronical interaction of two metal centers, syn-Zr2 exhibited significant cooperativity in comparison to anti-Zr2 and mono-Zr1, with regard to activity and molecular weight and 1-octene incorporation of resultant copolymers.
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Affiliation(s)
- Yanhong Xing
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Lingling Xu
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Shaofeng Liu
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhibo Li
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.,College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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Ji L, Song P, Zhou Y, Sun XL, Gao Y, Tang Y. A tridentate phenoxy-phosphine (POP) divalent chromium complex and its reactivities in olefin polymerization. Polym Chem 2023. [DOI: 10.1039/d2py01509a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We reported the synthesis and characterization of a Cr(ii) complex based on a tridentate phenoxy-phosphine ligand and studied its reactivities in ethylene and norbornene homopolymerization and ethylene copolymerization with norbornene or 1-octene.
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Affiliation(s)
- Li Ji
- Shenzhen Grubbs Institute and Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Guangdong, China
| | - Ping Song
- Shenzhen Grubbs Institute and Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Guangdong, China
| | - Youyun Zhou
- Shenzhen Grubbs Institute and Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Guangdong, China
| | - Xiu-Li Sun
- State key Laboratory of Organometallic Chemistry, Shanghai institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Yanshan Gao
- State key Laboratory of Organometallic Chemistry, Shanghai institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Yong Tang
- Shenzhen Grubbs Institute and Department of Chemistry, and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Guangdong, China
- State key Laboratory of Organometallic Chemistry, Shanghai institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
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Chen Y, Zhou S, Yang W, Liu S. Hafnium and Zirconium Complexes Bearing SNN-Ligands Enhancing Catalytic Performances toward Ethylene/1-Octene Copolymerization. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Yanjun Chen
- Zhejiang Collaborative Innovation Center for High Value Utilization of Byproducts from Ethylene Project, Ningbo Polytechnic, Ningbo 315800, China
- College of Chemical Engineering, Ningbo Polytechnic, Ningbo 315800, China
| | - Shengmei Zhou
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Weiqun Yang
- Zhejiang Collaborative Innovation Center for High Value Utilization of Byproducts from Ethylene Project, Ningbo Polytechnic, Ningbo 315800, China
- College of Chemical Engineering, Ningbo Polytechnic, Ningbo 315800, China
| | - Shaofeng Liu
- Zhejiang Collaborative Innovation Center for High Value Utilization of Byproducts from Ethylene Project, Ningbo Polytechnic, Ningbo 315800, China
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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Wu R, Niu Z, Huang L, Xia Z, Feng Z, Qi Y, Dai Q, Cui L, He J, Bai C. Vanadium complexes bearing the bulky bis(imino)pyridine ligands: Good thermal stability toward ethylene polymerization. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Liu R, Yang W, Li X, Feng L. Chromium-Based Complexes Bearing N-Substituted Diphosphinoamine Ligands for Ethylene Oligomerization. ACS OMEGA 2022; 7:35933-35941. [PMID: 36249395 PMCID: PMC9558249 DOI: 10.1021/acsomega.2c04733] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/14/2022] [Indexed: 06/01/2023]
Abstract
A range of novel N-substituted diphosphinoamine (PNP) ligands Ph2PN(R)PPh2 [R = F2CHCH2 (1); R = Me2CHCH2 (2); R = Me2CHCH2CH2 (3)] have been synthesized via one-step salt elimination reaction. The ligand-coordinated chromium carbonyls [Ph2PN(R)PPh2]Cr(CO)4 (4-6) were further synthesized, and X-ray crystallography analysis of complex 6 revealed the κ2-P,P bidentate binding mode of Cr center and the molecular structure of PNP ligand 3. Then the catalytic ethylene oligomerization behaviors of PNP ligands 1-3 bridging chromium chloride complexes {[Ph2PN(R)PPh2]CrCl2(μ-Cl)}2 (7-9) were further discussed in depth. Experimental results showed that complex 7 with the strong electron-withdrawing F2CHCH2 group can promote the nonselective ethylene oligomerization, while both complex 8 and complex 9 with the electron-donating Me2CHCH2 and Me2CHCH2CH2 groups can significantly enhance the selective ethylene tri/tetramerization. The good catalytic activity of 198.3 kg/(g Cr·h), the selectivity toward 1-hexene and 1-octene of 76.4%, and the low PE content of 0.2% were simultaneously achieved with the Al/Cr molar ratio of 600 using the complex 8/MMAO system at 45 °C and 45 bar. These excellent results were mainly attributed to the fact that the β-branching of bridging ligand 2 increased the steric bulk of the N-moiety for complex 8.
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Affiliation(s)
- Rui Liu
- State
Key Laboratory of Chemical Engineering, College of Chemical and Biological
Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, P.R. China
- Satellite
Chemical Co., Ltd, Jiaxing 314000, Zhejiang, P.R. China
| | - Weidong Yang
- Satellite
Chemical Co., Ltd, Jiaxing 314000, Zhejiang, P.R. China
| | - Xin Li
- Satellite
Chemical Co., Ltd, Jiaxing 314000, Zhejiang, P.R. China
| | - Lianfang Feng
- State
Key Laboratory of Chemical Engineering, College of Chemical and Biological
Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, P.R. China
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Tian J, Feng W, Liu S, Li Z. Titanium Complexes Bearing
NNO‐Tridentate
Ligands: Highly Active Olefin Polymerization Catalysts with Great Control on Molecular Weight and Distribution. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jiliang Tian
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao 266042 China
| | - Wenzheng Feng
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao 266042 China
| | - Shaofeng Liu
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao 266042 China
| | - Zhibo Li
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao 266042 China
- College of Chemical Engineering Qingdao University of Science and Technology Qingdao 266042 China
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da Silva SM, Pinheiro AC, da Costa MT, Alves TC, Oliboni RS, Stieler R, Casagrande AC, Casagrande O. Oligo- and polymerization of ethylene by pyrrolide-imine chromium catalysts bearing pendant O-, S- and N-donor groups. Synthesis, characterization and DFT studies. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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