Redox, thermodynamic and spectroscopic of some transition metal complexes containing heterocyclic Schiff base ligands
作者:Azza A.A. Abu-Hussen、Wolfgang Linert
DOI:10.1016/j.saa.2009.06.023
日期:2009.9
Complexes of two series of Schiff base ligands, H2La and H2Lb derived from the reaction of 2,6-diacetyl pyridine with semicarbazide, H2La and thiosemicarbazide, H2Lb, with the metal ions, Co(II), Ni(II), Cu(II), VO(IV) and UO2(VI) have been prepared. The ligands are characterized by elemental analysis, IR, UV–vis and 1H NMR. The structures of the complexes are investigated with the IR, UV–vis, X-band
2,6-二乙酰基吡啶与氨基脲,H 2 L a和硫代氨基脲,H 2 L b与金属离子Co反应的两个希夫碱配体H 2 L a和H 2 L b的配合物已经制备了(II),Ni(II),Cu(II),VO(IV)和UO 2(VI)。配体的特征在于元素分析,IR,UV-vis和1 H NMR。用IR,UV-vis,X波段ESR光谱研究了配合物的结构,11 H NMR和热重分析以及电导率和磁矩测量。红外光谱揭示了所研究的配体存在多种螯合模式。用三,四或五齿形式的两个配体获得了多种双核或单核复合物。在H 2 L a的情况下,键合位置为吡啶氮,两个偶氮甲碱氮原子和酮氧;在H 2 L b的情况下,键合位置为硫原子。Coats–Redfern方程已用于计算某些配合物不同热分解步骤的动力学和热力学参数。Co(II)和Ni(II)的循环伏安图显示了准可逆峰。已经表征了复合物的氧化还原性质和电活性物质的性质。