Synthesis, characterization and catalytic activity of three palladium(II) complexes containing Schiff base ligands
作者:Hai-Fu Guo、Yong Pan、De-Yun Ma、Kuan Lu、Liang Qin
DOI:10.1007/s11243-012-9635-y
日期:2012.10
Three new Pd(II) complexes of Schiff base ligands, namely, [Pd4(L1)4] (1), [Pd2(L2)2Cl2] (2) and [Pd(L3)2Cl2] (3) [HL 1 = N-(benzylidene)-2-aminophenol; L 2 = N-(2,4-dichlorobenzylidene)-2,6-diethylbenzenamine, L 3 = 4-(2,4-dichlorobenzylide-neamino)phenol] have been synthesized using solvothermal methods and characterized by elemental analysis, spectroscopy and single crystal X-ray diffraction. The crystal structures of the free ligands were also determined. The μ-oxygen-bridged tetranuclear cyclometallated Pd(II) complex (1) contains four nearly planar units, in which PdII is four-coordinate. Complex 2 is a μ-chloro-bridged dinuclear cyclometallated Pd(II) complex, whereas complex 3 is mononuclear. The Heck reactions of bromobenzene with acrylic acid catalyzed by complexes 1–3 have also been studied.
三种新的Pd(II)施夫配体配合物,即[Pd4(L1)4](1)、[Pd2(L2)2Cl2](2)和[Pd(L3)2Cl2](3)[HL1 = N-(苄叉)-2-氨基酚;L2 = N-(2,4-二氯苄叉)-2,6-二乙基苯胺,L3 = 4-(2,4-二氯苄叉氨基)酚],已采用溶剂热法合成并通过元素分析、光谱法和单晶X射线衍射进行了表征。游离配体的晶体结构也已确定。μ-氧桥联的四核周期金属化Pd(II)配合物(1)包含四个几乎平面的单元,其中PdII是四配位的。配合物2是一个μ-氯桥联的双核周期金属化Pd(II)配合物,而配合物3是单核的。还研究了配合物1–3催化的溴苯与丙烯酸的赫克反应。