含噻吩双水杨醛希夫碱铜、镍配合物合成与表征

Synthesis and Characterization of Copper and Nickel Complexes of Thiophene-Containing Bissalicylaldehyde Schiff Base

摘要:

以5,5′-亚甲基双水杨醛缩-2-(2-氨基苯胺基)-3-氰基-5-甲基噻吩希夫碱(L)和乙酸铜或乙酸镍为原料，合成了含噻吩双水杨醛希夫碱铜(II)、镍(II)配合物，用滴定分析、元素分析、红外光谱、紫外可见光谱和热分析对配合物进行了组成和结构表征。该双核配合物的组成为[M2L(H2O)2] (M = Cu2+，Ni2+)，中心离子与来自配体的亚胺基氮原子、酚羟基氧原子和氨基氮原子以及来自配位水分子中的氧原子形成了4配位的双核对称希夫碱配合物，其在空气气氛中的热分解反应包括脱水、配体的氧化分解过程，最后残余物为CuO或NiO。

Abstract:

Novel dinuclear Cu(II) and Ni(II) complexes of thiophene-containing bissalicylaldehyde Schiff base were synthesized with 5′-methylene-bis(salicylaldehyde)-5-methyl-2-[(2-aminophenyl)amino]thiophene-3-carbonitrile (L) and copper acetate or nickel acetate as raw materials. The complexes were characterized by titrimetric analyses, elemental analyses, UV-Vis, FT-IR spectra and thermal analysis (TG-DSC). The composition of the symmetrical binuclear Schiff base complexes was [M2L(H2O)2] (M = Cu2+, Ni2+). The central Cu2+ or Ni2+ ions were coordinated by imino nitrogen atoms, phenolic oxygen atoms and amino nitrogen atoms from the Schiff base ligand, and oxygen atoms from the coordinated water molecules, respectively. The pyrolysis reactions in the thermal decomposition processes of the complexes included dehydration and the oxidative decomposition of the ligand, at last only CuO or NiO was obtained.