Copper complexes of a family of pyridylmethylamide ligands HLPh, HLMe3 and HLPh3 were synthesized and characterized [HLPh = 2-phenyl-N-(2-pyridylmethyl)acetamide; HLMe3 = 2,2-dimethyl-N-(2-pyridylmethyl)propionamide; HLPh3 = 2,2,2-triphenyl-N-(2-pyridylmethyl)acetamide]. The reaction of copper(II) salts with the HL family and triethylamine in methanol yields copper(II) complexes [Cu4(LPh)4(OH)2](ClO4)2 (1), [Cu2(HLMe3)2(OMe)2(MeOH)2](OTf)2 (2) and [Cu2(HLPh3)2(OMe)2(MeOH)2](OTf)2 (3). The complexes have different nuclearity owing to varying steric properties of the ligands used. Complex 1 self-assembles in the presence of excess base to form a tetranuclear complex. Complexes 2 and 3 are binuclear and are bridged by a pair of methoxide ligands. Steric encumbrance of the ligands in 2 and 3 prevent cluster formation.
合成并表征了一系列
吡啶甲基胺
配体的
铜络合物,分别为 HLPh、HLMe3 和 HLPh3 [HLPh = 2-苯基-N-(2-
吡啶甲基)乙酰胺;HLMe3 = 2,2-二甲基-N-(2-
吡啶甲基)丙酰胺;HLPh3 = 2,2,2-三苯基-N-(2-
吡啶甲基)乙酰胺]。
铜(II)盐与 HL 系列
配体和
三乙胺在
甲醇中反应,得到
铜(II)络合物 [Cu4(LPh)4(OH)2](
ClO4)2 (1)、[Cu2(HLMe3)2(OMe)2(MeOH)2](OTf)2 (2) 和 [Cu2(HLPh3)2(OMe)2(MeOH)2](OTf)2 (3)。由于所用
配体的立体性质不同,这些络合物具有不同的核数。络合物 1 在多余的碱存在下自组装形成四核络合物。络合物 2 和 3 为双核络合物,由一对甲氧基
配体桥接。
配体在 2 和 3 中的空间位阻限制了簇的形成。