The CPO-27/MOF-74 series is among the most investigated metal-organic frameworks because of their usefulness in a diverse range of applications. For specific applications, it will be important to control the shape and size of the particles or crystallites of the material. The modulation approach has been successfully used to direct these parameters in the synthesis of MOFs. Here, we report the synthesis of CPO-27-Ni in the presence of different ratios of benzoic acid and acetic acid as modulators. Yields, powder X-ray diffraction data, scanning electron microscopy results, and elemental, thermogravimetric, and gas sorption analyses are compared to study the influence of the modulator on the product. The results show that we have successfully synthesized pure CPO-27-Ni independent of the amount of modulator. The modulator affects the resulting morphology of the crystalline product with a defined variation of particle sizes and shapes. In addition, ESI-MS has been employed in probing the reaction solutions. It shows the preferred formation of complexes between the metal cation and the modulator, thus indicating that the ligand substitution plays a major role in the crystal growth.

CPO-27 / MOF-74系列是研究最多的金属有机框架之一，因为它们在各种应用中都非常有用。对于特定应用，控制材料的颗粒或微晶的形状和大小非常重要。调制方法已成功用于指导MOF合成中的这些参数。在这里，我们报告了在存在不同比例的苯甲酸和乙酸作为调节剂的情况下CPO-27-Ni的合成。比较了产率，粉末X射线衍射数据，扫描电子显微镜结果以及元素，热重和气体吸附分析，以研究调制剂对产品的影响。结果表明，我们已经成功地合成了纯CPO-27-Ni，与调节剂的量无关。调节剂以限定的粒度和形状变化影响结晶产物的最终形态。此外，ESI-MS已用于探测反应溶液。它显示了金属阳离子和调节剂之间优选形成络合物，因此表明配体取代在晶体生长中起主要作用。