水杨醛缩L-异亮氨基酸Schiff碱过渡金属Cu(Ⅱ), Zn(Ⅱ), Ni(Ⅱ)配合物的电化学合成及表征

采用Cu, Zn, Ni为“牺牲”阳极, 在无隔膜电解槽和含配体水杨醛缩L-异亮氨基酸Schiff碱的乙腈溶液中电解合成了Cu(Ⅱ), Zn(Ⅱ)和Ni(Ⅱ)配合物. 利用元素分析、红外光谱、紫外光谱、热分析等手段对配合物的结构进行了表征, 测定了Cu(Ⅱ)配合物的电化学性质. 结果表明, 配合物的化学组成为ML·nH2O(L=C13H15NO3, M=Cu(Ⅱ), Zn(Ⅱ), Ni(Ⅱ), n=1, 1, 2), 配合物具有相似的空间结构, 配体均以三齿进行配位; 电合成配合物的电化学效率Ef 接近0.5 mol/FZn(Ⅱ), Ni(Ⅱ)]和1.0 mol/FCu(Ⅱ)], Cu(Ⅱ)配合物中Cu(Ⅱ)L/Cu(Ⅰ)L电对的可逆半波电位Er1/2为-0.79 V.

Electrochemical Synthesis and Characterization of Transition Metal Cu(Ⅱ),Zn(Ⅱ),Ni(Ⅱ) Complexes with a Schiff Base Ligand from Salicylidene and L-isoleucine

The direct electrosynthesis of Cu(Ⅱ), Zn(Ⅱ) and Ni(Ⅱ) complexes of salicylideneamino acid was accomplished by electrochemical dissolution of sacrificial metallic anodes in an acetonitrile solution of the ligand salicylideneamino acid in not membrane electrolytic cell. The complexes were characterized by FTIR, elemental analysis, UV-Vis spectra and thermal analysis. And the electrochemical property of Cu(Ⅱ) complex was examined. The complex formula is ML·nH2O, where L=L-isoleucine Schiff base, M=Cu(Ⅱ), Zn(Ⅱ), Ni(Ⅱ), n=1,1,2. The complexes have a similar spatial structure and the ligand was tricoordinate. The electrochemical efficiency Ef is near 0.5 mol/Ffor Zn(Ⅱ), Ni(Ⅱ) complexes] and 1.0 mol/Ffor Cu(Ⅱ) complex]. In the Cu(Ⅱ) complex, Er1/2 of Cu(Ⅱ)L/Cu(Ⅰ)L couple was -0.79 V(vs. SCE).