Transitionmetal complexes with pyrazole-based ligands
Journal of Thermal Analysis and Calorimetry(2005)
摘要
The thermal decomposition of Cu 2 L 2 Cl 4 , Cu 2 L 2 Cl 2 , Cu 2 L 2 Br 2 and Co 2 L 2 Cl 4 complexes ( L =3,5-dimethyl-1-thiocarboxamidepyrazole) is described. The influence of the central ion to ligand mole ratio on the course of complex formation is examined in reaction of L with copper(II) chloride. In Cu(II):L mole ratio of 1:1, in methanolic solution the reaction yields to yellow-green Cu 2 L 2 Cl 4 crystals. In the filtrate a thermodynamically more stable orange Cu 2 L 2 Cl 2 copper(I) complex is forming. With a Cu(II): L mole ratio of 1:2 only the latter compound is obtained. The composition and the structure of the compounds have been determined on the basis of customary methods. On the basis of FTIR spectrum of the intermediate which is forming during the thermal decomposition of Cu 2 L 2 Cl 2 a decomposition mechanism is proposed.
更多查看译文
关键词
cobalt(II) chloride or bromide complexes,copper(I) chloride or bromide complexes,copper(II) chloride or bromide complexes,coupled TG-MS measurement,3,5-dimethyl-1-carboxamidepyrazole,TA
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络