Synthesis, Structural Visualization, Spectroscopic, and Thermal Studies of Charge Transfer Cu(II), Ni(II) and Zn(II) Bromides-carbamide Complexes at Elevated Temperature
作者:Khlood Abou-Melha、Moamen S. Refat、Khaled M. Elsabawy
DOI:10.13005/ojc/310336
日期:2015.9.24
In the present study, the composition and structure of Cu(II), Ni(II) and Zn(II) compounds resulted from the chemical reactions of copper(II), nickel(II) and zinc(II) bromide salts with carbamide in aqueous media at 95 oC have been investigated, using IR, electron spin resonance ESR and x-ray powder diffraction spectroscopy as well as thermal analysis TG/DTG/DSC. The Cu2(OH)3Br, [Ni2(NCO)2(H2O)2(Br)2], and ZnCO3.xH2O compounds were achieved by a novel synthetic route through with a low cost precursor like carbamide. The infrared spectra of the results indicate absence of the individual bands of carbamide, but exhibited of the distinguished bands of hydroxyl, isocyanate, NCO, and ionic carbonate, CO32– for Cu(II), Ni(II) and Zn(II) compounds, respectively. Visualized investigations were performed to confirm crystal structure, validity and stability of the product compounds. A general reaction mechanisms describing the preparation of Cu(II), Ni(II), and Zn(II) compounds were discussed.
在本研究中,使用红外光谱、电子自旋共振(ESR)、X射线粉末衍射光谱以及热分析(TG/DTG/DSC)探讨了铜(II)、镍(II)和锌(II)溴化物盐与尿素在水相中以95℃进行化学反应所生成的化合物的组成和结构。通过一种新颖的合成路线,利用低成本的前体尿素,成功获得了Cu2(OH)3Br、[Ni2(NCO)2(H2O)2(Br)2]和ZnCO3·xH2O化合物。结果的红外光谱显示尿素的特征带消失,而分别展现了Cu(II)、Ni(II)和Zn(II)化合物中羟基、异氰酸盐、NCO和离子碳酸盐(CO32–)的显著特征带。进行了可视化研究以确认产物化合物的晶体结构、有效性和稳定性。讨论了描述Cu(II)、Ni(II)和Zn(II)化合物制备的一般反应机制。