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本文对一系列四个配合物[Pd(dppm) Cl_2](1)、[Pd(dppe)Cl_2](2)、[Pd(dppp)Cl_2](3)和[Pd(dppf)Cl_2](4)的晶体结构进行了比较研究。其中,dppm 为双(二苯基磷)甲烷,dppe 为1,2-双(二苯基膦)乙烷,dppp 为1.3-双(二苯基膦)丙烷,dppf 为1,1′-双(二苯基膦)二茂铁。配合物(1)、(2)和(3)中配体的差别仅在于两个膦原子间的亚甲基数目不同(分别为1个,2个和3个亚甲基),但导致 P-Pd-P 键角明显不同。而配合物(4)的 P-pd-P 键角最大。四个配合物中的 Pd-P 键长及 Pd-Cl 键长也有明显差别。讨论了四种双膦配体 dppm、dppe、dppp 和 dppf 的电子效应及立体效应的差别。
In this paper, a series of four complexes [Pd (dppm) Cl_2] (1), [Pd (dppe) Cl_2] (2), [Pd (dppp) Cl_2] ) Crystal structure of a comparative study. Dppm is 1,2-bis (diphenylphosphino) ethane, dppp is 1.3-bis (diphenylphosphino) propane, dppf is 1,1’-bis (Diphenylphosphino) ferrocene. Ligands in complexes (1), (2) and (3) only differ in the number of methylene groups between two phosphine atoms (1, 2 and 3 methylene, respectively) -Pd-P Key angle is significantly different. The complex P-pd-P bond angle (4) is the largest. The four complexes of Pd-P bond length and Pd-Cl bond length are also significantly different. The electronic and stereoscopic effects of the four bisphosphine ligands dppm, dppe, dppp and dppf are discussed.