m‐phenylene‐bridged derivatives. These binuclear complexes (Ti2L1–Ti2L3) could catalyze ethylenepolymerization and copolymerization with 1,5‐hexadiene(1,5‐HD) efficiently under modified methylaluminoxane activation. Compared with the mononuclear complex TiL5, the binuclearcatalysts were thermally more stable and showed higher activity for ethylenepolymerization at higher temperatures. The activity
与单核对应物相比,由于其独特的催化性能,用于烯烃聚合的双核络合物引起了极大的关注。在此制备了一系列对苯撑桥联双β-羰基亚胺配体及其双核Ti络合物Ti 2 L 1 - Ti 2 L 3,并通过1 H NMR,13 C NMR,傅里叶变换红外光谱和元素分析进行了表征。双核络合物Ti 2 L 3单晶X射线衍射进一步研究了带有辛硫基侧臂的配体,该配体为β-亚氨基烯醇形式,一个钛原子与其他六个原子连接,形成了变形的八面体构型。此外,在配体的Ti 2大号3采用了顺式构型,这是从不同的反式其配置米-亚苯基桥接的衍生物。这些双核络合物(Ti 2 L 1 – Ti 2 L 3)可以在改性甲基铝氧烷活化下有效催化1,5-己二烯(1,5-HD)的乙烯聚合和共聚。与单核络合物TiL 5相比,双核催化剂在热方面更稳定,并且在较高温度下显示出更高的乙烯聚合活性。这些钛络合物在乙烯与1,5-HD的共聚反应中的活性超过10
Synthesis, characterization and olefin polymerization behaviors of phenylene-bridged bis-β-carbonylenamine binuclear titanium complexes
two active catalytic centers may be present, consistent with the asymmetrical crystal structure of the binuclear titanium complex. Furthermore, these complexes possessed better thermal stability than their mononuclear analogues. Compared with the complexes bearing alkylthio sidearms, the complex Ti2L5 bearing a phenylthio sidearm exhibited higher catalytic activity towards ethylene polymerization and
与单核配合物相比,双核和多核配合物由于其独特的烯烃聚合催化性能而备受关注。在这项工作中,合成并表征了一系列苯基桥联双-β-羰基胺[O - NS R ](R =烷基或苯基)三齿配体及其双核钛配合物(Ti 2 L 1 -Ti 2 L 5 )通过1 H NMR、13 C NMR、FTIR 和元素分析。配体L 2 (R = n Pr)及其对应的Ti配合物Ti 2 L的分子结构2通过单晶X射线衍射进一步研究,表明每个钛与六个原子配位形成扭曲的八面体构型,同时配体从β-羰基胺转化为β-亚氨基烯醇形式。在MMAO的活化下,这些配合物以极高的活性(超过10 6 g mol (Ti) -1 h -1 atm -1)催化乙烯聚合和乙烯/α-烯烃共聚,生产高分子量聚乙烯。同时,与单核对应物TiL 6相比,多分散性更广观察到,表明可能存在两个活性催化中心,这与双核钛络合物的不对称晶体结构一致。此外,这些配合物比它
Asymmetric bis-salicylaldiminato binuclear titanium complexes for ethylene polymerization and copolymerization
asymmetric binuclear catalysts showed higher catalytic activity (up to 2.29 × 106 g mol(Ti)−1 h−1 atm−1) for ethylenepolymerization to produce higher molecular weight polyethylenes with much wider molecular weight distribution due to the presence of two different active centers. For ethylenepolymerization and copolymerization with 1-hexene, the catalytic activity of binuclear 5a which carries phenylthio and
具有高分子量和宽分子量分布的聚烯烃由于其易于加工和应用广泛而备受关注。在本文中,亚甲基桥连的不对称disalicylaldimine配体轴承苯硫基和烷硫基的sidearms(4A-4C)从与2-苯硫基和2-烷硫基苯胺,然后直接用TiCl 4配位依次反应的亚甲基桥disalicylaldehyde合成4,得到非对称一步制备双水杨醛基双核钛配合物5a-5c。不对称配合物通过 FTIR、1 H NMR、13C NMR和元素分析。在改性甲基铝氧烷 (MMAO) 的活化下,这些不对称配合物显示出超过 10 6 g mol(Ti) -1 h -1 atm -1 的高活性,用于乙烯聚合和与 1-己烯或降冰片烯的共聚。与相应的单核配合物相比,不对称双核催化剂表现出更高的催化活性(高达 2.29 × 10 6 g mol(Ti) -1 h -1 atm -1) 由于存在两个不同的活性中心,乙烯聚合以生产具有
Binuclear Titanium Catalysts Based on Methylene-Bridged Tridentate Salicylaldiminato Ligands for Ethylene Homo- and Copolymerization
methylaluminoxane (MMAO), these binuclear Ti complexes displayed extremely high activities in the range of 106 g mol−1 h−1 atm−1 for ethylenepolymerization and ethylene/α-olefins copolymerization at atmospheric pressure, producing high molecular weight polymers with narrow polydispersity. Both the catalytic behavior and the spectroscopic characterization indicated that the catalysts assumed symmetric structure
Significant cooperative effects in binuclear titanium complexes based on trifluoromethyl substituted bis-β-carbonylenamine ligands for ethylene (co)polymerization
led to relatively shortmetal-metalseparation in binuclear complexes. Activated by MAO, the binuclear complex Ti2mLa exhibited the highest activity for ethylene polymerization and ethylene/α-olefins copolymerization, and the highest comonomer incorporation, relative to other binuclear Ti2mLb, Ti2mLc and Ti2pLa and mononuclear Ti1La. For ethylene polymerization, the activity of complex Ti2mLa was almost
双核协同效应可以大大提高烯烃聚合的催化性能,但很少用于早期过渡非茂金属双核配合物。这里合成并表征了一系列间-和对 -亚苯基桥联的双-β-亚羰基胺配体和相应的双核钛配合物(Ti 2 m L a - Ti 2 m L c,Ti 2 p L a),具有配体m L a的分子结构通过单晶X射线衍射进一步表征,表明甲硫基苯胺与三氟甲基旁边的羰基反应,从而导致双核配合物中金属-金属分离时间相对较短。由 MAO 激活,双核络合物Ti 2 m L a表现出最高的乙烯聚合和乙烯/α-烯烃共聚活性,以及最高的共聚单体掺入量,相对于其他双核Ti 2 m L b,Ti 2 m L c和Ti 2 p L a和单核Ti 1 L一个。对于乙烯聚合,络合物Ti 2 m L a的活性几乎是对亚苯基桥接衍生物Ti 2 p L a和单核Ti 1 L a的 4 倍和 2.6 倍,并且络合物Ti 2 m L a的活性对于乙烯/1-己烯共聚是Ti