behaviour. Second, complex properties are also influenced by the substituents (methyl and halogen) grafted on the aromatic ring and on the azomethynic groups. The donating methyl substituent on the azomethynic groups causes a decrease in the E1/2 value, whereas the halogen substituents on the aromatic rings have two effects: a mesomeric donating effect that tends to lower the redox potential of the complex
摘要报道了一系列四卤代二甲基salen和二卤代四甲基salen
配体的合成,表征和催化活性。3,3',5,5'-四
氯-α,α'-二甲基-莎伦(tCldMeSalen)(
L2); 3,3′-二
溴-5,5′-二
氯-α,α′-二甲基-Salen,(dCldBrdMeSalen)(L3);3,3',5,5'-四
溴-α,α'-二甲基-萨伦(tBrdMeSalen)(L4); 3,3',5,5'-四
碘-α,α'-二甲基salen,(tIdMeSalen)(L5); 3,3'-二
氯-5,5',α,α'-四甲基萨伦(dCltMeSalen)(L6); 3,3'-dibromo-5,5',α,α'-四甲基萨伦(dBrtMeSalen)(L7); 和3,3'-二
碘-5,5',α,α'-四甲基萨伦(dItMeSalen)(L8)(萨伦=双(
水杨醛)
乙二胺)。与Co(II)离子反应后,这些
配体形成具有正方形平面几何