Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization

Heng Liu; Rui Zhuang; Bo Dong; Feng Wang; Yan-Ming Hu; Xue-Quan Zhang

doi:10.1007/s10118-018-2097-8

Your Location：

Home >

Browse articles >

Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization

ARTICLE | Updated：2021-02-18

- Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization
- 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年36卷第8期页码：943-952
- Affiliations：
  
  a.CAS Key Laboratory of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.University of Chinese Academy of Sciences, Beijing 100049, China
  c.College of Materials Science and Engineering, Jilin University, Changchun 130022, China
- Author bio：
  
  ymhu@ciac.ac.cn (Y.M.H.)
  xqzhang@ciac.ac.cn (X.Q.Z.)
- Funds：
  
  This work was financially supported by the National Key R&D Program of China (No. 2017YFB0307100 (2017YFB0307103)) and National Basic Research Program of China (No. 2015CB654700 (2015CB654702)).
- DOI：10.1007/s10118-018-2097-8
  中图分类号：
- 收稿：2017-10-27，
  
  录用：2017-11-27，
  
  网络首发：2018-02-26，
  
  纸质出版：2018-08
- Accepted：
Scan QR Code
Heng Liu, Rui Zhuang, Bo Dong, 等. Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization[J]. Chinese Journal of Polymer Science, 2018,36(8):943-952.

Heng Liu, Rui Zhuang, Bo Dong, et al. Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization[J]. Chinese Journal of Polymer Science, 2018, 36(8): 943-952.
Heng Liu, Rui Zhuang, Bo Dong, 等. Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization[J]. Chinese Journal of Polymer Science, 2018,36(8):943-952. DOI： 10.1007/s10118-018-2097-8.

Heng Liu, Rui Zhuang, Bo Dong, et al. Mono- and Binuclear Cobalt(II) Complexes Supported by Quinoline-2-imidate Ligands: Synthesis, Characterization, and 1,3-Butadiene Polymerization[J]. Chinese Journal of Polymer Science, 2018, 36(8): 943-952. DOI： 10.1007/s10118-018-2097-8.

摘要

Abstract

A series of mono- and binuclear Co(II) complexes (

Co1

–

Co7

) supported by quinoline-2-imidate ligands were synthesized and thoroughly characterized. Measured by single crystal X-ray crystallography

complexes

Co1

and

Co3

adopted distorted tetrahedral structures around the cobalt center. Upon activation by ethylaluminium sesquichloride (EASC)

these cobalt complexes exhibited high catalytic activity and

cis

-1

4-selectivity towards 1

3-butadiene polymerization. The effects of ligand environment

polymerization temperature

and cocatalyst types on the polymerization were investigated in detail. Interestingly

the binuclear Co(II) complexes exhibited high thermal stability

and the polymer yields were up to 97.2% even at a high temperature of 70 °C.

关键词

Keywords

references

Johnson, L. K.; Killian, C. M.; Brookhart, M . New Pd(II)-based and Ni(II)-based catalysts for polymerization of ethylene and alpha-olefins . J. Am. Chem. Soc. , 1995 . 117 ( 23 ): 6414 - 6415 . DOI: 10.1021/ja00128a054 http://doi.org/10.1021/ja00128a054 .

Johnson, L. K.; Mecking, S.; Brookhart, M . Copolymerization of ethylene and propylene with functionalized vinyl monomers by palladium(II) catalysts . J. Am. Chem. Soc. , 1996 . 118 ( 1 ): 267 - 268 . DOI: 10.1021/ja953247i http://doi.org/10.1021/ja953247i .

Ittel, S. D.; Johnson, L. K.; Brookhart, M . Late-metal catalysts for ethylene homo- and copolymerization . Chem. Rev. , 2000 . 100 ( 4 ): 1169 - 1204 . DOI: 10.1021/cr9804644 http://doi.org/10.1021/cr9804644 .

Ma, J.; Feng, C.; Wang, S.; Zhao, K.Q.; Sun, W.H.; Redshaw, C.; Solan, G. A . Bi- and tri-dentate imino-based iron and cobalt pre-catalysts for ethylene oligo-/polymerization . Inorg. Chem. Front. , 2014 . 1 ( 1 ): 14 - 34 . DOI: 10.1039/C3QI00028A http://doi.org/10.1039/C3QI00028A .

Gibson, V. C.; Redshaw, C.; Solan, G. A . Bis(imino)pyridines: Surprisingly reactive ligands and a gateway to new families of catalysts . Chem. Rev. , 2007 . 107 ( 5 ): 1745 - 1776 . DOI: 10.1021/cr068437y http://doi.org/10.1021/cr068437y .

Britovsek, G. J. P.; Bruce, M.; Gibson, V. C.; Kimberley, B. S.; Maddox, P. J.; Mastroianni, S.; McTavish, S. J.; Redshaw, C.; Solan, G. A.; Stromberg, S.; White, A. J. P.; Williams, D. J . Iron and cobalt ethylene polymerization catalysts bearing 2,6-bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies . J. Am. Chem. Soc. , 1999 . 121 ( 38 ): 8728 - 8740 . DOI: 10.1021/ja990449w http://doi.org/10.1021/ja990449w .

Rose, J . Living polymerization of α -olefins with an α -diimine Ni(II) catalyst: formation of well-defined ethylene-propylene copolymers through controlled chain-walking . J. Am. Chem. Soc. , 2006 . 128 ( 13 ): 4186 - 4187 . DOI: 10.1021/ja058183i http://doi.org/10.1021/ja058183i .

Yu, J.; Liu, H.; Zhang, W.; Hao, X.; Sun, W.H . Access to highly active and thermally stable iron procatalysts using bulky 2-[1-(2,6-dibenzhydryl-4-methylphenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridine ligands . Chem. Commun. , 2011 . 47 ( 11 ): 3257 - 3259 . DOI: 10.1039/c0cc05373b http://doi.org/10.1039/c0cc05373b .

Makio, H.; Terao, H.; Iwashita, A.; Fujita, T . FI catalysts for olefin polymerization—a comprehensive treatment . Chem. Rev. , 2011 . 111 ( 3 ): 2363 - 2449 . DOI: 10.1021/cr100294r http://doi.org/10.1021/cr100294r .

Wu, J.; Li, Y . Well-defined vanadium complexes as the catalysts for olefin polymerization . Coord. Chem. Rev. , 2011 . 255 ( 19-20 ): 2303 - 2314 . DOI: 10.1016/j.ccr.2011.01.048 http://doi.org/10.1016/j.ccr.2011.01.048 .

Yue, E.; Zhang, L.; Xing, Q.; Cao, X. P.; Hao, X.; Redshaw, C.; Sun, W. H . 2-(1-(2-Benzhydrylnaphthylimino)ethyl) pyridylnickel halides: synthesis, characterization, and ethylene polymerization behavior . Dalton Trans. , 2014 . 43 ( 2 ): 423 - 431 . DOI: 10.1039/C3DT52234B http://doi.org/10.1039/C3DT52234B .

Pan, H.; Zhu, L.; Li, J.; Zang, D.; Fu, Z.; Fan, Z . A thermal stable α -diimine palladium catalyst for copolymerization of ethylene with functionalized olefins . J. Mol. Cat. A: Chem. , 2014 . 390 76 - 82 . DOI: 10.1016/j.molcata.2014.03.008 http://doi.org/10.1016/j.molcata.2014.03.008 .

Dai, S.; Sui, X.; Chen, C . Synthesis of high molecular weight polyethylene using iminopyridyl nickel catalysts . Chem. Commun. , 2016 . 52 ( 58 ): 9113 - 9116 . DOI: 10.1039/C6CC00457A http://doi.org/10.1039/C6CC00457A .

Liu, J.; Chen, D.; Wu, H.; Xiao, Z.; Gao, H.; Zhu, F.; Wu, Q . Polymerization of α -olefins using a camphyl α -diimine Nickel catalyst at elevated temperature . Macromolecules , 2014 . 47 ( 10 ): 3325 - 3331 . DOI: 10.1021/ma5004634 http://doi.org/10.1021/ma5004634 .

Song, K.; Yang, W.; Li, B.; Liu, Q.; Redshaw, C.; Li, Y.; Sun, W. H . Nickel(ii) complexes bearing 4,5-bis(arylimino)pyrenylidenes: synthesis, characterization, and ethylene polymerization behaviour . Dalton Trans. , 2013 . 42 ( 25 ): 9166 - 9175 . DOI: 10.1039/C2DT32343E http://doi.org/10.1039/C2DT32343E .

Mu, H.; Pan, L.; Song, D.; Li, Y . Neutral nickel catalysts for olefin homo- and copolymerization: relationships between catalyst structures and catalytic properties . Chem. Rev. , 2015 . 115 ( 22 ): 12091 - 12137 . DOI: 10.1021/cr500370f http://doi.org/10.1021/cr500370f .

Du, S.; Kong, S.; Shi, Q.; Mao, J.; Guo, C.; Yi, J.; Liang, T.; Sun, W. H . Enhancing the activity and thermal stability of nickel complex precatalysts using 1-[2,6-bis(bis(4-fluorophenyl)methyl)-4-methyl phenylimino]-2-arylimino acenaphthylene derivatives . Organometallics , 2015 . 34 ( 3 ): 582 - 590 . DOI: 10.1021/om500943u http://doi.org/10.1021/om500943u .

Suo, H.; Zhao, T.; Wang, Y.; Ban, Q.; Sun, W. H . N -(2,2-dimethyl-1-(quinolin-2-yl)propylidene) arylaminonickel complexes and their ethylene oligomerization . Molecules , 2017 . 22 ( 4 ): 630 DOI: 10.3390/molecules22040630 http://doi.org/10.3390/molecules22040630 .

Gong, D.; Wang, B.; Bai, C.; Bi, J.; Wang, F.; Dong, W.; Zhang, X.; Jiang, L . Metal dependent control of cis -/ trans -1,4 regioselectivity in 1,3-butadiene polymerization catalyzed by transition metal complexes supported by 2,6-bis[1-(iminophenyl)ethyl]pyridine . Polymer , 2009 . 50 ( 26 ): 6259 - 6264 . DOI: 10.1016/j.polymer.2009.10.054 http://doi.org/10.1016/j.polymer.2009.10.054 .

Chen, H . Controlled polymerization of isoprene promoted by a type of hemilabile X[double bond, length as m-dash]PN3 (X = O, S) ligand supported cobalt(ii) complexes: the role of a hemilabile donor on the level of control . Polym. Chem. , 2017 . 8 ( 11 ): 1805 - 1814 . DOI: 10.1039/C7PY00252A http://doi.org/10.1039/C7PY00252A .

Jiang, X.; Wen, X.; Sun, W. H.; He, A . Polymerization of isoprene catalyzed by 2-(methyl-2-benzimidazolyl)-6-(1-(arylimino) ethyl) pyridine iron(III) trichloride with an additional donor . J. Polym. Sci., Part A: Polym. Chem. , 2014 . 52 ( 17 ): 2398 - 2398 . .

Liu, H.; Yang, S. Z.; Wang, F.; Bai, C. X.; Hu, Y. M; Zhang, X. Q . Polymerization of 1,3-butadiene catalyzed by cobalt(II) and nickel(II) complexes bearing pyridine-2-imidate ligands . Chinese J. Polym. Sci. , 2016 . 34 ( 9 ): 1060 - 1069 . DOI: 10.1007/s10118-016-1825-1 http://doi.org/10.1007/s10118-016-1825-1 .

Gong, D.; Jia, X.; Wang, B.; Wang, F.; Zhang, C.; Zhang, X.; Jiang, L.; Dong, W . Highly trans -1,4 selective polymerization of 1,3-butadiene initiated by iron(III) bis(imino)pyridyl complexes . Inorg. Chim. Acta , 2011 . 373 ( 1 ): 47 - 53 . DOI: 10.1016/j.ica.2011.03.047 http://doi.org/10.1016/j.ica.2011.03.047 .

Wang, B.; Bi, J.; Zhang, C.; Dai, Q.; Bai, C.; Zhang, X.; Hu, Y.; Jiang, L . Highly active and trans -1,4 specific polymerization of 1,3-butadiene catalyzed by 2-pyrazolyl substituted 1,10-phenanthroline ligated iron(II) complexes . Polymer , 2013 . 54 ( 19 ): 5174 - 5181 . DOI: 10.1016/j.polymer.2013.07.021 http://doi.org/10.1016/j.polymer.2013.07.021 .

Ai, P.; Chen, L.; Guo, Y.; Jie, S.; Li, B. G . Polymerization of 1,3-butadiene catalyzed by cobalt(II) and nickel(II) complexes bearing imino- or amino-pyridyl alcohol ligands in combination with ethylaluminum sesquichloride . J. Organom. Chem. , 2012 . 705 ( 0 ): 51 - 58 . .

Cariou, R.; Chirinos, J. J.; Gibson, V. C.; Jacobsen, G.; Tomov, A. K.; Britovsek, G. J. P.; White, A. J. P . The effect of the central donor in bis(benzimidazole)-based cobalt catalysts for the selective cis -1,4-polymerisation of butadiene . Dalton Trans. , 2010 . 39 ( 38 ): 9039 - 9045 . DOI: 10.1039/c0dt00402b http://doi.org/10.1039/c0dt00402b .

Gong, D.; Wang, B.; Jia, X.; Zhang, X . The enhanced catalytic performance of cobalt catalysts towards butadiene polymerization by introducing a labile donor in a salen ligand . Dalton Trans. , 2014 . 43 ( 10 ): 4169 - 4178 . DOI: 10.1039/c3dt52708e http://doi.org/10.1039/c3dt52708e .

Jie, S.; Ai, P.; Li, B . Highly active and stereospecific polymerization of 1,3-butadiene catalyzed by dinuclear cobalt(II) complexes bearing 3-aryliminomethyl-2-hydroxybenzaldehydes . Dalton Trans. , 2011 . 40 ( 41 ): 10975 - 10982 . DOI: 10.1039/c1dt11073j http://doi.org/10.1039/c1dt11073j .

Endo, K.; Hatakeyama, N . Stereospecific and molecular weight-controlled polymerization of 1,3-butadiene with Co(acac)3-MAO catalyst . J. Polym. Sci., Part A: Polym. Chem. , 2001 . 39 ( 16 ): 2793 - 2798 . DOI: 10.1002/(ISSN)1099-0518 http://doi.org/10.1002/(ISSN)1099-0518 .

Gong, D.; Wang, B.; Cai, H.; Zhang, X.; Jiang, L . Synthesis, characterization and butadiene polymerization studies of cobalt(II) complexes bearing bisiminopyridine ligand . J. Organom. Chem. , 2011 . 696 ( 8 ): 1584 - 1590 . DOI: 10.1016/j.jorganchem.2011.01.015 http://doi.org/10.1016/j.jorganchem.2011.01.015 .

Jia, X.; Liu, H.; Hu, Y.; Dai, Q.; Bi, J.; Bai, C.; Zhang, X . Highly active and cis -1,4 selective polymerization of 1,3-butadiene catalyzed by cobalt(II) complexes bearing α -diimine ligands . Chin. J. Cat. , 2013 . 34 ( 8 ): 1560 - 1569 . DOI: 10.1016/S1872-2067(12)60625-1 http://doi.org/10.1016/S1872-2067(12)60625-1 .

Alnajrani, M. N.; Mair, F. S . Synthesis and characterization of [small beta]-triketimine cobalt complexes and their behaviour in the polymerization of 1,3-butadiene . Dalton Trans. , 2014 . 43 ( 42 ): 15727 - 15736 . DOI: 10.1039/C4DT02196G http://doi.org/10.1039/C4DT02196G .

Alnajrani, M. N.; Mair, F. S . The behaviour of [small beta]-triketimine cobalt complexes in the polymerization of isoprene . RSC Adv. , 2015 . 5 ( 57 ): 46372 - 46385 . DOI: 10.1039/C5RA06792H http://doi.org/10.1039/C5RA06792H .

Chandran, D.; Kwak, C. H.; Ha, C. S.; Kim, I . Polymerization of 1,3-butadiene by bis(salicylaldiminate)cobalt(II) catalysts combined with organoaluminium cocatalysts . Catal. Today , 2008 . 131 ( 1-4 ): 505 - 512 . DOI: 10.1016/j.cattod.2007.10.068 http://doi.org/10.1016/j.cattod.2007.10.068 .

Endo, K.; Kitagawa, T.; Nakatani, K . Effect of an alkyl substituted in salen ligands on 1,4-cis selectivity and molecular weight control in the polymerization of 1,3-butadiene with (salen)Co(II) complexes in combination with methylaluminoxane . J. Polym. Sci., Part A: Polym. Chem. , 2006 . 44 ( 13 ): 4088 - 4094 . DOI: 10.1002/(ISSN)1099-0518 http://doi.org/10.1002/(ISSN)1099-0518 .

Guo, J.; Zhang, C.; Bi, J.; Zhang, H.; Bai, C.; Hu, Y.; Zhang, X . Cobalt complexes bearing pyridine-imino ligands with bulky aryl substituents: synthesis, characterization, and 1,3-butadiene polymerization behaviors . J. Organom. Chem. , 2015 . 798 414 - 421 . DOI: 10.1016/j.jorganchem.2015.05.004 http://doi.org/10.1016/j.jorganchem.2015.05.004 .

Wang, B.; Gong, D.; Bi, J.; Dai, Q.; Zhang, C.; Hu, Y.; Zhang, X.; Jiang, L . Synthesis, characterization and 1,3-butadiene polymerization behaviors of cobalt complexes bearing 2-pyrazolyl-substituted 1,10-phenanthroline ligands . Appl. Organomet. Chem. , 2013 . 27 ( 4 ): 245 - 252 . DOI: 10.1002/aoc.v27.4 http://doi.org/10.1002/aoc.v27.4 .

Guo, J.; Wang, B.; Bi, J.; Zhang, C.; Zhang, H.; Bai, C.; Hu, Y.; Zhang, X . Synthesis, characterization and 1,3-butadiene polymerization studies of cobalt dichloride complexes bearing pyridine bisoxazoline ligands . Polymer , 2015 . 59 ( 24 ): 124 - 132 . .

Appukuttan, V.; Zhang, L.; Ha, J. Y.; Chandran, D.; Bahuleyan, B. K.; Ha, C.S.; Kim, I . Stereospecific polymerizations of 1,3-butadiene catalyzed by Co(II) complexes ligated by 2,6-bis(benzimidazolyl)pyridines . J. Mol. Catal. A: Chem. , 2010 . 325 ( 1-2 ): 84 - 90 . DOI: 10.1016/j.molcata.2010.04.002 http://doi.org/10.1016/j.molcata.2010.04.002 .

Gong, D.; Jia, X.; Wang, B.; Zhang, X.; Jiang, L . Synthesis, characterization, and butadiene polymerization of iron(III), iron(II) and cobalt(II) chlorides bearing 2,6-bis(2-benzimidazolyl)pyridyl or 2,6-bis(pyrazol)pyridine ligand . J. Organom. Chem. , 2012 . 702 ( 1 ): 10 - 18 . .

Appukuttan, V.; Zhang, L.; Ha, C. S.; Kim, I . Highly active and stereospecific polymerizations of 1,3-butadiene by using bis(benzimidazolyl)amine ligands derived Co(II) complexes in combination with ethylaluminum sesquichloride . Polymer , 2009 . 50 ( 5 ): 1150 - 1158 . DOI: 10.1016/j.polymer.2008.12.047 http://doi.org/10.1016/j.polymer.2008.12.047 .

Liu, H.; Jia, X.; Wang, F.; Dai, Q.; Wang, B.; Bi, J.; Zhang, C.; Zhao, L.; Bai, C.; Hu, Y.; Zhang, X . Synthesis of bis( N -arylcarboximidoylchloride)pyridine cobalt(ii) complexes and their catalytic behavior for 1,3-butadiene polymerization . Dalton Trans. , 2013 . 42 ( 37 ): 13723 - 13732 . DOI: 10.1039/c3dt51403j http://doi.org/10.1039/c3dt51403j .

Liu, H.; Wang, F.; Jia, X.; Liu, L.; Bi, J.; Zhang, C.; Zhao, L.; Bai, C.; Hu, Y.; Zhang, X . Synthesis, characterization, and 1,3-butadiene polymerization studies of Co(II), Ni(II), and Fe(II) complexes bearing 2-( N -arylcarboximidoylchloride)quinoline ligand . J. Mol. Cat. A: Chem. , 2014 . 391 25 - 35 . .

Delferro, M.; Marks, T. J . Multinuclear Olefin Polymerization Catalysts . Chem. Rev. , 2011 . 111 ( 2 ): 2450 - 2485 . .

Sun, W.H.; Xing, Q.; Yu, J.; Novikova, E.; Zhao, W.; Tang, X.; Liang, T.; Redshaw, C . Probing the characteristics of mono- or bimetallic (iron or cobalt) complexes bearing 2,4-bis(6-iminopyridin-2-yl)-3H-benzazepines: synthesis, characterization, and ethylene reactivity . Organometallics , 2013 . 32 ( 8 ): 2309 - 2318 . DOI: 10.1021/om301086p http://doi.org/10.1021/om301086p .

Han, S.; Yao, E.; Qin, W.; Zhang, S.; Ma, Y . Binuclear heteroligated titanium catalyst based on phenoxyimine ligands: synthesis, characterization, and ethylene (Co)polymerization . Macromolecules , 2012 . 45 ( 10 ): 4054 - 4059 . DOI: 10.1021/ma300384w http://doi.org/10.1021/ma300384w .

Salata, M. R.; Marks, T. J . Synthesis, characterization, and marked polymerization selectivity characteristics of binuclear phenoxyiminato organozirconium catalysts . J. Am. Chem. Soc. , 2008 . 130 ( 1 ): 12 - 13 . DOI: 10.1021/ja076857e http://doi.org/10.1021/ja076857e .

Wang, R.; Sui, X.; Pang, W.; Chen, C . Ethylene polymerization by xanthene-bridged dinuclear α -diimine NiII complexes . Chemcatchem , 2016 . 8 ( 2 ): 434 - 440 . DOI: 10.1002/cctc.201501041 http://doi.org/10.1002/cctc.201501041 .

Liu, J.; Li, Y.; Liu, J.; Li, Z . Ethylene polymerization with a highly active and long-lifetime macrocycle trinuclear 2,6-bis(imino)pyridyliron . Macromolecules , 2005 . 38 ( 7 ): 2559 - 2563 . DOI: 10.1021/ma047685y http://doi.org/10.1021/ma047685y .

Song, S.; Zhao, W.; Wang, L.; Redshaw, C.; Wang, F.; Sun, W . Synthesis, characterization and catalytic behavior toward ethylene of cobalt(II) and iron(II) complexes bearing 2-(1-aryliminoethylidene)quinolines . J. Organom. Chem. , 2011 . 696 ( 18 ): 3029 - 3035 . DOI: 10.1016/j.jorganchem.2011.06.003 http://doi.org/10.1016/j.jorganchem.2011.06.003 .

Liu, H.; Wang, F.; Liu, L.; Dong, B.; Zhang, H.; Bai, C.; Hu, Y.; Zhang, X . Synthesis, characterization and 1,3-butadiene polymerization behaviors of three ONO, ONN, and NNN tridentate Co(II) complexes . Inorg. Chim. Acta , 2014 . 421 284 - 291 . .

浏览量

290

Downloads

CSCD

文章被引用时，请邮件提醒。

Submit

工具集

关联资源

1,3-Butadiene Polymerizations Catalyzed by Cobalt and Iron Dichloride Complexes Bearing Pyrazolylimine Ligands

Modulating Molecular Weight of Polyethylenes from Oligomer to Polymer Using Highly Thermal Stable Cationic α-Diimine Palladium Complexes

Preparation and Hydrogenation of Dicyclopentadiene-based Cyclic Olefin Copolymers

Topology-regulated Co-assembly of Single Chain Polymer Nanoparticles and Block Copolymers into Hierarchical Micelle@Vesicle Composite Structures

Special Topic: Chirality in Polymers