水杨醛亚胺类镍系配合物的合成及其催化乙烯聚合

Synthesis of (Salicylaldinato) nickel Complexes and Their Catalysis for Ethylene Polymerization

摘要: 合成了一系列含不同取代基水杨醛亚胺配体L₁~L₅，及相应镍配合物C₁~C₅，并用核磁共振(¹H-NMR)、红外光谱(IR)、质谱(Mass)和元素分析(EA)等手段对配体及配合物进行了表征。以C₃为单组分催化剂，研究了在不同聚合条件下单组分催化剂对乙烯聚合的影响，结果表明在极性溶剂二氯甲烷中单组分催化剂显示出高的催化活性，甚至在二氯甲烷与水的混合溶剂中也具有一定的聚合活性。以

Abstract: A series of substituted salicylaldiminato ligands L₁—L₅ and corresponding nickel(II) complexes C₁—C₅ were prepared and characterized by ¹H-NMR, IR, Mass and EA. Using C₃ as a single-component catalyst, ethylene polymerization was investigated under different polymerization conditions. C₃ exhibited the highest activity in CH₂Cl₂ among the applied solvents, and even medium activity in mixed solvent of CH₂Cl₂ and H₂O. Under optimal conditions, the polymerization activities of C₁—C₅ were compared. Complexes with bulky substituents on the ortho-position of salicylaldiminato displayed high activity, while those with electron-withdrawing groups in ortho-position or para-position, provided low catalytic activities.