0000000001305299
AUTHOR
Tongling Liang
2-(1-Aryliminoethyl)-9-arylimino-5,6,7,8- tetrahydrocycloheptapyridyl iron(II) dichloride: synthesis, characterization, and the highly active and tunable active species in ethylene polymerization
A series of 2-(1-arylimino)ethyl-9-arylimino-5,6,7,8-tetrahydrocycloheptapyridine derivatives was synthesized and fully characterized, and thereafter reacted with iron dichloride to form their corresponding iron(II) complexes. The single crystals of representative organic and iron complex compounds were obtained and analyzed by the X-ray diffraction analysis, indicating the distorted bipyramidal geometry around the iron core. Moreover, DFT calculations were performed on selected species to determine their structural features. On treatment with either MAO or MMAO, all iron complex pre-catalysts showed high activities (up to 1.56 × 10(7) gPE mol(-1)(Fe) h(-1)) toward ethylene polymerization. …
The chloro‐substituent enhances performance of 2,4‐bis (imino)pyridylchromium catalysts yielding highly linear polyethylene
The five unsymmetrical 2‐[1‐(2,4‐dibenzhydryl‐6‐chlorophenylimino)ethyl]‐6‐[1‐(arylimino)ethyl]pyridine compounds (aryl: 2,6‐Me2Ph L1 , 2,6‐Et2Ph L2 , 2,6‐i Pr2Ph L3 , 2,4,6‐Me3Ph L4 and 2,6‐Et2–4‐MePh L5 ) were prepared and characterized with FT‐IR and 1H/13C NMR spectroscopy as well as elemental analysis. The treatment of L1 – L5 with CrCl3·3THF affords the corresponding chromium chloride complexes (Cr1 – Cr5 ) in excellent yields. The molecular structures of Cr2 and Cr3 characterized by X‐ray diffraction show a distorted octahedral geometry with three nitrogen atoms and three chlorine atoms around the metal center. On activation with either MAO or MMAO, Cr1 – Cr5 collectively display hig…
Enhancing Performance of a Bis(arylimino)pyridine‐Iron Precatalyst for Ethylene Polymerization by Substitution with a 2,4‐Bis(4,4′‐dimethoxybenzhydryl)‐6‐methylphenyl Group
A series of unsymmetrical 2-(2,4-bis(bis(4-methoxyphenyl)methyl)-6-MeC6H2N)-6-(1-(arylimino)ethyl)pyridine-iron halides has been synthesized and characterized. The molecular structure of two representative species was determined by the single-crystal X-ray diffraction. Activated with either MAO or MMAO, the precatalysts displayed high activity, reaching 2.19×107 g PE (mol Fe)−1 h−1 at 60 °C in ethylene polymerization. The microstructural analysis of the polymers obtained indicates highly linear polyethylene containing a vinyl chain end.
Tailoring polymers through interplay of ligands within precatalysts: 8-(Nitro/benzhydryl-arylimino)-7,7-dimethyl-5,6-dihydroquinolylnickel halides in ethylene polymerization
A series of 8-(nitro/benzhydryl-substituted arylimino)-7,7-dimethyl-5,6-dihydroquinolines and the corresponding nickel halide complexes were synthesized and characterized. Molecular structures of representative nickel complexes were determined by single crystal X-ray diffraction, showing the dinuclear dimers with distorted square-pyramidal geometry around the nickel center. The binding energies determined by X-ray photoelectron spectroscopy (XPS) indicate the effective coordination between the sp2-nitrogen and nickel atoms as well as the influence of both the halogen ligands and the substituents within dihydroquinolines on the strength of the NiN bond. Ethylene polymerization with the nicke…
Nickel(II) complexes with sterically hindered 5,6,7-trihydroquinoline derivatives selectively dimerizing ethylene to 1-butene
A series of nickel complexes bearing N,N-bidentate ligands has been synthesized and characterized by elemental analysis and infrared (IR) spectroscopy. High ethylene dimerization activity, reaching 2.43 × 106 g mol−1(Ni)h−1, was achieved by using these complexes as precatalysts activated with Me2AlCl. Moreover, the selectivity to obtain α-C4 was high (93%–96%). Comparing with the previous report by our group, the higher activity and selectivity may be attributed to the substituent at the 2-position within the ligand, creating the steric hindrance around the metal atom.
CCDC 1530049: Experimental Crystal Structure Determination
Related Article: Chaunbing Huang, Yanning Zeng, Zygmunt Flisak, Zhijuan Zhao, Tongling Liang, Wen-Hua Sun|2017|J.Polym.Sci.,Part A:Polym.Chem.|55|2071|doi:10.1002/pola.28595
CCDC 2124204: Experimental Crystal Structure Determination
Related Article: Wenhua Lin, Ming Liu, Lei Xu, Yanping Ma, Liping Zhang, Zygmunt Flisak, Xinquan Hu, Tongling Liang, Wen‐Hua Sun|2022|Appl.Organomet.Chem.|36|e6596|doi:10.1002/aoc.6596
CCDC 1008609: Experimental Crystal Structure Determination
Related Article: Fang Huang, Qifeng Xing, Tongling Liang, Zygmunt Flisak, Bin Ye, Xinquan Hu, Wenhong Yang, Wen-Hua Sun|2014|Dalton Trans.|43|16818|doi:10.1039/C4DT02102A
CCDC 1008610: Experimental Crystal Structure Determination
Related Article: Fang Huang, Qifeng Xing, Tongling Liang, Zygmunt Flisak, Bin Ye, Xinquan Hu, Wenhong Yang, Wen-Hua Sun|2014|Dalton Trans.|43|16818|doi:10.1039/C4DT02102A
CCDC 2063053: Experimental Crystal Structure Determination
Related Article: Shi‐Fang Yuan, Zhe Fan, Mingyang Han, Yi Yan, Zygmunt Flisak, Yanping Ma, Tongling Liang, Wen‐Hua Sun|2021|Eur.J.Inorg.Chem.|2021|1571|doi:10.1002/ejic.202100145
CCDC 1008608: Experimental Crystal Structure Determination
Related Article: Fang Huang, Qifeng Xing, Tongling Liang, Zygmunt Flisak, Bin Ye, Xinquan Hu, Wenhong Yang, Wen-Hua Sun|2014|Dalton Trans.|43|16818|doi:10.1039/C4DT02102A
CCDC 2063054: Experimental Crystal Structure Determination
Related Article: Shi‐Fang Yuan, Zhe Fan, Mingyang Han, Yi Yan, Zygmunt Flisak, Yanping Ma, Tongling Liang, Wen‐Hua Sun|2021|Eur.J.Inorg.Chem.|2021|1571|doi:10.1002/ejic.202100145
CCDC 1530048: Experimental Crystal Structure Determination
Related Article: Chaunbing Huang, Yanning Zeng, Zygmunt Flisak, Zhijuan Zhao, Tongling Liang, Wen-Hua Sun|2017|J.Polym.Sci.,Part A:Polym.Chem.|55|2071|doi:10.1002/pola.28595
CCDC 2124203: Experimental Crystal Structure Determination
Related Article: Wenhua Lin, Ming Liu, Lei Xu, Yanping Ma, Liping Zhang, Zygmunt Flisak, Xinquan Hu, Tongling Liang, Wen‐Hua Sun|2022|Appl.Organomet.Chem.|36|e6596|doi:10.1002/aoc.6596
CCDC 1951481: Experimental Crystal Structure Determination
Related Article: Badral Gansukh, Qiuyue Zhang, Zygmunt Flisak, Tongling Liang, Yanping Ma, Wen‐Hua Sun|2020|Appl.Organomet.Chem.|34|e5471|doi:10.1002/aoc.5471
CCDC 1951482: Experimental Crystal Structure Determination
Related Article: Badral Gansukh, Qiuyue Zhang, Zygmunt Flisak, Tongling Liang, Yanping Ma, Wen‐Hua Sun|2020|Appl.Organomet.Chem.|34|e5471|doi:10.1002/aoc.5471