4-polybutadiene with high selectivity (>96%) under the Al/Co molar ratio of 40 at 25 °C. The conversion of butadiene, microstructure and molecular weight of the resulting polymers were affected by the reaction parameters and ligand environment. However, in comparison with the corresponding cobalt complexes, the nickel complexes (1b–6b) obtained relatively lower catalytic activity, cis-1,4 content and molecular
                                    由亚
氨基或
氨基吡啶醇
配体(三齿[NNO]),2-(2,6-R 1 2)支撑的一系列
钴(II)(1a - 6a)和
镍(II)(1b - 6b)配合物C 6 H 3 N = CMe)-6-(HO)CR 2 } C 5 H 3 N(L1 - L4)和2-(2,6-R 1 2 C 6 H 3 NHCHMe)-6-(CH 2 OH)C 5 H 3 N(L5和L6通过元素和光谱分析以及X射线衍射分析进行合成和表征。X射线衍射表明,所有配合物均采用扭曲的三角双锥体构型,其赤道面由
吡啶基氮原子和两个
氯原子组成。在用倍半
氯化乙基铝(EASC)活化后,
钴配合物(1a - 6a)对
1,3-丁二烯聚合产生顺式显示出高催化活性。在25°C下Al / Co摩尔比为40时具有高选择性(> 96%)的-
1,4-聚丁二烯。
丁二烯的转化率,所得聚合物的微观结构和分子量受反应参数和
配体环境的影响。然而,与相应的
钴配合物相比,
镍配合物(1b