Synthesis, spectroscopy, electrochemistry and thermal study of uranyl N3O2 Schiff base complexes
作者:Ali Hossein Kianfar、Mostafa Kazemi Boudani、Mahmoud Roushani、Mojtaba Shamsipur
DOI:10.1007/s13738-011-0055-2
日期:2012.8
The new [UO2L(CH3OH)] [where L = bis(salicylaldehyde)2,6-diiminopyridine (L1), bis(5-methoxysalicylaldehyde)2,6-diiminopyridine (L2), bis(5-bromosalicylaldehyde)2,6-diiminopyridine (L3), bis(5-nitrosalicylaldehyde)2,6-diiminopyridine (L4)] complexes were synthesized and characterized by IR, UV–vis and elemental analysis. Methanol solvent is coordinated to uranyl complexes. The electrochemical properties of the uranyl complexes were investigated by cyclic voltammetry in DMF solvent. Thermogravimetry and differential thermoanalysis of the uranyl complexes were carried out in the range of 20–700 °C. The UO2L4 complex was decomposed in two and the others were decomposed in three stages. Up to 85 °C, the coordinated solvent was released then the Schiff base ligands were decomposed in one or two steps. Decomposition of synthesized complexes is related to the Schiff base characteristics. The thermal decomposition reaction is first order for the studied complexes.
新的[UO2L(CH3OH)] [其中L = bis(盐醛)2,6-二亚胺吡啶(L1),bis(5-甲氧基盐醛)2,6-二亚胺吡啶(L2),bis(5-溴盐醛)2,6-二亚胺吡啶(L3),bis(5-硝基盐醛)2,6-二亚胺吡啶(L4)]复合物被合成并通过红外光谱、紫外-可见光谱和元素分析进行了表征。甲醇溶剂与铀酰复合物配位。通过循环伏安法在DMF溶剂中研究了铀酰复合物的电化学性质。在20–700 °C范围内对铀酰复合物进行了热重分析和差示热分析。UO2L4复合物分解为两个阶段,而其他复合物分解为三个阶段。在85 °C之前,配位溶剂被释放,然后Schiff碱配体在一个或两个步骤中分解。合成复合物的分解与Schiff碱的特性有关。所研究复合物的热分解反应是一级反应。