论文部分内容阅读
在甲醇溶液中，以乙酸钴、氯化钴、硝酸钴和缩二脲为原料合成了3种结构不同的缩二脲钴配合物．通过元素分析、红外光谱、X射线粉末衍射和热分析对产物进行了表征，其化学组成为[Co（bi）2（H2O）2]（Ac）2· H2O （1），[Co（bi）2Cl2]（2）和[Co（bi）3]（NO3）2·2．5H2O （3）（bi ＝NH2CONHCONH2）．配合物1中每个Co2＋与2个缩二脲分子中的4个羰基氧原子和2个水分子中的氧原子配位，配合物2中每个Co2＋与2个缩二脲分子中的4个羰基氧原子和2个氯原子配位，而配合物3中每个Co2＋与6个全部来自缩二脲分子的羰基氧原子配位，均形成了配位数为6的配合物．配合物1和3的热分解过程包括失水和配体的分解，而配合物2的热分解过程只是配体的分解过程，最后完全分解形成氧化钴．“,”Three kinds of cobalt complexes of biuret were synthesized with cobalt acetate, cobalt chloride or cobalt nitrate and biuret as starting materials in methanol solution.The complexes were char-acterized by elemental analyses, FTIR spectra, X-ray powder diffraction, and thermogravimetric analysis. The compositions of the complexes were[Co(bi)2(H2O)2](Ac)2· H2O (1),[Co(bi)2Cl2] (2), and [Co(bi)3](NO3)2· 2.5H2O (3) (bi =NH2CONHCONH2).The cobalt ion in complex 1 was coordi-nated by six oxygen atoms from two biuret molecules and two water molecules, the cobalt ion in complex 2 was coordinated by four carbonyl oxygen atoms from two biuret molecules and two chloride atoms, while the cobalt ion in complex 3 was coordinated by six carbonyl oxygen atoms from three biuret molecules. The cobalt ions were all hexa-coordinated.The thermal decomposition processes of complex 1 and 3 under air included dehydration and pyrolysis of the ligands and anions, while the thermal decomposition process of complex 2 was only the pyrolysis of ligands, and the final residues were all cobalt oxide.