which then reacted with (DME)NiBr2 to form 10‐aryliminocycloocta[b]pyridylnickel bromides (Ni1–Ni5). The new compounds were characterized by means of FT‐IR spectroscopy as well as elemental analysis and the organic ligands were also analyzed by the NMR measurements. Furthermore, the molecular structure of a representative complex Ni3 was determined by the single crystal X‐ray diffraction, indicating
环辛并[ b ]
吡啶-10-酮制备以形成相应的亚
氨基衍
生物,其然后与(
DME)NIBR 2以形成10-aryliminocycloocta [ b ] pyridylnickel
溴化物(NI1 - NI5)。通过FT-IR光谱和元素分析对新化合物进行了表征,并通过NMR测量分析了有机
配体。此外,代表性的复合物Ni3的分子结构是通过单晶X射线衍射确定的,表明
镍原子周围的四面体几何形状失真。用甲基铝氧烷(MAO)或
氯化二乙基铝活化后(Et 2AlCl),标题
镍络合物在
乙烯聚合反应中表现出高活性,并生产出低分子量(1.43–6.78 kg mol -1)和低分散度(1.7–2.4)的聚
乙烯,这表明存在单中心催化体系。更重要的是,通过在
配体中选择合适的取代基并调节聚合条件,可以容易地调节所得聚
乙烯的微观结构(特别是支化度)和某些物理性质,例如T m值。这一发现表明,使用一种催化剂按需合成不同类型的