Synthesis, Characterization , Crystal Structures and Catalytic Performance of 2,6-Bis(imino)pyridyl Manganese Complexes

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (6): 1239.

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Synthesis, Characterization , Crystal Structures and Catalytic Performance of 2,6-Bis(imino)pyridyl Manganese Complexes

FAN Rui-Qing^1*, YUAN Guo-Hui², DING Xiao-Dong¹, CHEN Jie³, YANG Yu-Lin^1*

1. Department of Chemistry,
2. School of Chemical Engineering & Technology, Harbin Institute of Technology, Harbin 150001, China;
3. Daqing Oilfield Company Ltd. Exploration and Development Research Institute, Daqing 163712, China

Received:2010-11-04 Revised:2011-03-25 Online:2011-06-10 Published:2011-05-10
Contact: FAN Rui-Qing;YANG Yu-Lin E-mail:fanruiqing@163.com;ylyang@hit.edu.cn
Supported by:
国家自然科学基金(批准号： 21071035, 20971031), 黑龙江省自然科学基金重点项目(批准号: ZD201009)和哈尔滨市科技创新人才基金(批准号: 2010RFQXG017)资助.

Abstract

Abstract: Reactions of equimolar rations of MnCl2?4H2O and the tridentate ligands 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine (L1), 2,6-bis[1-(2,6-diethy phenylimino)ethyl]pyridine (L2), and 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine(L3) in acetonitrile afford the five-coordinated complexes L1Mn(II)Cl2?CH3CN(Mn1), L2Mn(II)Cl2?CH3CN(Mn2) and L3Mn(II)Cl2?CH3CN(Mn3), respectively. All complexes were characterized using elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Crystallographic studies on complexes Mn1–Mn3 reveal three complexes to be pentacoordinate with geometries that can be best described as distorted trigonal bipyramidal. Mn1 crystallizes in the monoclinic system, space group P21/n, with a = 1.3304(3) nm, b = 1.4864(3) nm, c = 1.4423(3) nm; β = 108.41(3)?, V = 2.7063(9) nm3, Z = 4, F(000) = 1116 , R1 = 0.0465. Mn2 belongs to monoclinic system with space group P21/c, with a = 1.2919(1) nm, b = 1.5283(1) nm, c = 1.6362(1) nm; β = 99.27(1)?, V = 3.1883(3) nm3, Z = 4, F(000) = 1244, R1 = 0.0599. Mn3 belongs to monoclinic system with space group P21/n, with a = 1.4542(3) nm, b = 1.5083(3) (1) nm, c = 1.4646(3) nm; β = 112.56(3)?, V = 2.9667(10) nm3, Z = 4, F(000) = 1180, R1 = 0.0627. Complexes Mn1–Mn3 exhibit lower catalytic activities for ethylene polymerization after activation with cocatalysts of [Ph3C]+[B(C6F5)4]-.

Key words: 2,6-Bis(imino)pyridyl manganese complexes, crystal structure, Ethylene polymerization

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FAN Rui-Qing*, YUAN Guo-Hui, DING Xiao-Dong, CHEN Jie, YANG Yu-Lin*. Synthesis, Characterization , Crystal Structures and Catalytic Performance of 2,6-Bis(imino)pyridyl Manganese Complexes[J]. Chem. J. Chinese Universities, 2011, 32(6): 1239.

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Synthesis, Characterization , Crystal Structures and Catalytic Performance of 2,6-Bis(imino)pyridyl Manganese Complexes

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