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dc.contributor.authorGong, Dirong
dc.contributor.authorJia, Xiaoyu
dc.contributor.authorWang, Baolin
dc.contributor.authorZhang, Xuequan
dc.contributor.authorHuang, Kuo-Wei
dc.date.accessioned2015-08-03T12:07:55Z
dc.date.available2015-08-03T12:07:55Z
dc.date.issued2014-09
dc.identifier.issn0022328X
dc.identifier.doi10.1016/j.jorganchem.2014.05.018
dc.identifier.urihttp://hdl.handle.net/10754/563725
dc.description.abstractTridentate chromium complexes (Cr1-Cr7) incorporated with symmetrical pincer ligand bis(arylimino)pyridine and bis(pyrzaolyl)pyridine have been synthesized and characterized by elemental analyis, FT-IR as well as ESI-MS. X-ray diffraction reveals solids-state structures of Cr2, Cr4 and Cr6 all adopt pseudo-octahedral coordination environment with respect to metal center. All complexes have been tested in stereoregulated polymerization of butadiene under various polymerization conditions. The trans-1,4 and cis-1,4 enchainment of resultant polymer are found to be dependent on the structure of ligand and amount of activator used. Under the optimized condition, free ortho-substitutes Cr catalysts Cr1, Cr3, Cr4 and Cr6 are capable of initiating high trans-1,4 selectivity (trans-1,4: 89.2%-92.0%) with good polymer yields (71.5%-78.0%), while counterparts with ortho-positioned alkyl groups Cr2, Cr5 and Cr7 display mixed selectivities with moderate polymer yields. The sterical effect of ligand and amount of MMAO on the catalytic performance, in particular, the stereoselectivity and polymer yield, has been also elucidated by conjugated diene polymerization mechanism. © 2014 Elsevier B.V. All rights reserved.
dc.description.sponsorshipFunding from Natural Science Foundation of China (Grant No. 21304050) and sponsored by the K. C. Wong Magna Fund in Ningbo University, are gratefully acknowledged.
dc.publisherElsevier BV
dc.subjectButadiene
dc.subjectChromium catalyst
dc.subjectPincer ligand
dc.subjectTrans-1,4 polybutadiene
dc.titleTrans-1,4 selective polymerization of 1,3-butadiene with symmetry pincer chromium complexes activated by MMAO
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentHomogeneous Catalysis Laboratory (HCL)
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Organometallic Chemistry
dc.contributor.institutionSchool of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
dc.contributor.institutionKey Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, No. 1799, Jimei Road, Xiamen, Fujian 361021, China
dc.contributor.institutionNingbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, Ningbo, Zhejiang 315830, China
dc.contributor.institutionResearch Center of High Performance Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
kaust.personHuang, Kuo-Wei
dc.relation.issupplementedbyDOI:10.5517/cc11dt7h
dc.relation.issupplementedbyDOI:10.5517/cc11dt8j
dc.relation.issupplementedbyDOI:10.5517/cc11dt9k
display.relations<b> Is Supplemented By:</b> <br/> <ul><li><i>[Dataset]</i> <br/> Gong, D., Jia, X., Wang, B., Zhang, X., & Huang, K.-W. (2014). CCDC 965626: Experimental Crystal Structure Determination [Data set]. Cambridge Crystallographic Data Centre. https://doi.org/10.5517/cc11dt7h. DOI: <a href="https://doi.org/10.5517/cc11dt7h">10.5517/cc11dt7h</a> HANDLE: <a href="http://hdl.handle.net/10754/624270">10754/624270</a></li><li><i>[Dataset]</i> <br/> Gong, D., Jia, X., Wang, B., Zhang, X., & Huang, K.-W. (2014). CCDC 965627: Experimental Crystal Structure Determination [Data set]. Cambridge Crystallographic Data Centre. https://doi.org/10.5517/cc11dt8j. DOI: <a href="https://doi.org/10.5517/cc11dt8j">10.5517/cc11dt8j</a> HANDLE: <a href="http://hdl.handle.net/10754/624271">10754/624271</a></li><li><i>[Dataset]</i> <br/> Gong, D., Jia, X., Wang, B., Zhang, X., & Huang, K.-W. (2014). CCDC 965628: Experimental Crystal Structure Determination [Data set]. Cambridge Crystallographic Data Centre. https://doi.org/10.5517/cc11dt9k. DOI: <a href="https://doi.org/10.5517/cc11dt9k">10.5517/cc11dt9k</a> HANDLE: <a href="http://hdl.handle.net/10754/624272">10754/624272</a></li></ul>


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