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来源:百度知道 编辑:UC知道 时间:2024/05/29 13:45:10
Mononuclear carbon bridged cyclopentadienyl chromium complexes of the type〔(C5H4)C(C5 H10)CH2(C5 H4 N)〕CrCl2(1),〔(C5 H4 )C(CH3)2 CH2 (C5 H4 N)〕CrCl2(2)and homodinuclear chromium complex of the type( CH3)2 C{〔( C5 H3)C(CH3)2 CH2 (C5 H4 N)〕CrCl2}2 (3)were prepared by treatment of the lithium salts of cyclopentadiene ligands with pyridyl group with CrCl3 (THF)3 in THF solution . All complexes were structurally characterized by mass spectra and elemental analysis . The structure of complex 1 was determined by X-ray diffraction analysis . Activated by MAO,complexes 1 and 2 are efficient catalysts in the polymerization of ethylene yielding polyethylene( PE)with a high molecular weight( MV ranging from 225800 to 637800 g•mol - 1,30 ≤Tp≤70℃ under 0 . 9 MPa monomer pressure). High activities of polymerization are related to the unique electronic and steric structure of complexes 1 and 2 . The melting points of the polymers determined by DSC and characterization data of 13 C NMR all show

单个核碳桥环戊二烯铬配合物的类型〔 ( c5h4 ) , C (下碳五的H10 ) CH2的(碳五和H4 n )的〕 crcl2 ( 1 ) , 〔 (碳五和H4 )架C和( CH3 ) 2 CH2的(碳五和H4 n )的〕 crcl2 ( 2 )和homodinuclear铬复杂的类型和( CH3 ) 2架C ( 〔 (碳五的H3 )架C和( CH3 ) 2 CH2的(碳五和H4 n )的〕 crcl2 ) 2 ( 3 )编写了治疗的锂盐的环戊二烯配体与吡啶集团与crcl3 (四氢呋喃) 3在THF的解决办法。所有化合物的结构特点是质谱和元素分析。结构复杂,一决心通过X射线衍射分析。激活毛,络合物1和2是一种高效率的催化剂在乙烯聚合高产聚乙烯( PE )是具有高分子量(毫伏不等,从225800到637800克• mol -维基词典1 ,30≤总磷≤ 7 0℃下为0 。九兆帕斯卡单体压力) 。高活动的聚合都涉及到了独特的电子和立体结构的络合物1和2 。熔点聚合物取决于DSC和表征数据13碳核磁共振都表明合成线性聚乙烯(液相外延) ,以低分支程度