Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one uncharged donor bound via a boron-containing bridge and comprising one or more atoms of group 15 and/or 16 of the Periodic Table of the Elements and is bound to a metal selected from the group consisting of titanium in the oxidation state 3, vanadium, chromium, molybdenum and tungsten, a catalyst system comprising at least one of the monocyclopentadienyl complexes, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system and polymers obtainable in this way.
单
环戊二烯基配合物中,
环戊二烯基系统至少带有一个未带电的供体,通过含
硼桥键结合,并包含元素周期表第15和/或16族的一个或多个原子,并与选自氧化态为3的
钛、
钒、
铬、
钼和
钨的
金属结合,催化剂系统包括至少一种单
环戊二烯基配合物,该催化剂系统用于烯烃的聚合或共聚合,以及在该催化剂系统存在下通过烯烃的聚合或共聚合制备聚烯烃的方法和由此获得的聚合物。