Abstract The parallel flow drop solvothermal method was utilized to synthesize the crystal of MOF-5 by taking the molar ratio of the metal ions to the organic ligands of 2:1 at 140∘C, and the reaction time at 12 hours. Meanwhile, the structure and properties of MOF-5 were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA) and fourier transform infrared spectroscopy (FTIR). SEM analysis shown that the crystal morphology of MOF-5 changed from sheet to cubic with increasing reaction temperature and molar ratio of the metal ions to the organic ligands, and its thermal stability was also gradually increased. TGA analysis shown that its thermal stability could live up to 489.36∘C. FTIR analysis shown that the terephthalic acid is completely protonated, and the Zn2+ and the carboxyl group are formed by the coordination of the multi-tooth bridge in the crystal of MOF-5. Then the structure activity relationship of the crystal MOF-5 synthesis, microstructural, thermal stability and N2 adsorption property were further studied.

中文翻译：

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晶体MOF-5合成、热稳定性和N2吸附性能的构效关系研究

摘要 采用平行流滴溶剂热法合成MOF-5晶体，在140∘C下金属离子与有机配体的摩尔比为2:1，反应时间为12小时。同时，通过X射线衍射（XRD）、扫描电子显微镜（SEM）、热重分析（TGA）和傅里叶变换红外光谱（FTIR）对MOF-5的结构和性能进行了表征。SEM分析表明，随着反应温度的升高和金属离子与有机配体的摩尔比的增加，MOF-5的晶体形态由片状变为立方体，其热稳定性也逐渐提高。TGA分析表明其热稳定性可达到489.36∘C。FTIR分析表明对苯二甲酸完全质子化，Zn2+和羧基是通过MOF-5晶体中多齿桥的配位形成的。然后进一步研究了晶体MOF-5合成、微观结构、热稳定性和N2吸附性能的构效关系。