室温固相法合成2-吡啶甲酸钴、镍配合物

Synthesis and Characterization of Cobalt(Ⅱ) and Nickel(Ⅱ) Complexes of 2-Picolinic Acid by Room Temperature Solid-Solid Reaction

利用乙酸钴(Ⅱ)、氯化镍(Ⅱ)和2-吡啶甲酸为原料,采用室温固相法合成了2-吡啶甲酸钴(Ⅱ)、镍(Ⅱ)配合物M(C5H4NCOO)2.xH2O(M=Co,Ni;x=6,3),用EDTA配位滴定、元素分析、X射线粉末衍射、红外光谱和热分析等方法对产物进行组成和结构表征。结果表明,2-吡啶甲酸中的羧基氧原子和杂环氮原子及水分子参与配位,其热分解包括失水、配体的氧化分解过程,最后完全形成金属氧化物。

The 2-picolinate complexes M（C5H4NCOO）2 · xH2O of cobalt（ Ⅱ ） and nickel（ Ⅱ ） were synthesized with cobalt acetate, nickel chloride and 2-pyridinecarboxylic acid as reactants by solid-state reaction at room temperature. The composition and structures of the complexes were characterized by means of EDTA titration, elemental analysis, FTIR spectrum, X-ray powder diffraction, thermogravimetric and differential thermal analysis. The results of characterization showed that cobalt （ Ⅱ ） and nickel（ Ⅱ ） were coordinated by the heterocyclic nitrogen atoms and carboxyl oxygen atoms of the ligands, and by the oxygen atoms from the water molecules, respectively. Thermal decomposition processes of the complexes included dehydration, oxidation and pyrolysis of the ligands, which were finally to give metallic oxide.