缩二脲锌配合物的合成与表征

Synthesis and Characterization of Zinc Complexes of Biuret

以硝酸锌、乙酸锌及硫酸锌和缩二脲为原料,在甲醇溶液中反应合成了3种含有不同阴离子和结晶水的缩二脲锌配合物[Zn(bi)2](NO3)2·2H2O、[Zn(bi)2](Ac)2·1.5H2O和[Zn(bi)2]SO4·0.25H2O(bi=NH2CONHCONH2),用EDTA配位滴定、元素分析、X射线粉末衍射、红外光谱对产物进行组成和结构表征,并研究了配合物的热分解过程。实验结果表明,锌离子与缩二脲中的羰基氧原子配位,形成了配位数为4的配合物。配合物的热分解过程包括失水、配体及阴离子的氧化分解过程,最后完全分解形成氧化锌。

Three kinds of zinc complexes of biuret with different anions and crystallization water were synthesized by methanol solution reactions with zinc nitrate,zinc acetate or zinc sulfate and biuret as starting materials. The composition and structures of the complexes were characterized by means of EDTA titration,elemental analyses,FTIR spectra,and X-ray powder diffraction. The thermal decomposition of the complexes was studied. The experimental results showed that the zinc ions in the complexes were all quaternarily coordinated with the carbonyl oxygen atoms from the biuret ligands. The thermal decomposition processes of the zinc complexes included dehydration,oxidation and pyrolysis of the ligand and anions,and the final residue was zinc oxide.