Lu Jiayi, Nieckarz Damian, Jiang Hao, Zhu Zhiwen, Yan Yuyi, Zheng Fengru, Rżysko Wojciech, Lisiecki Jakub, Szabelski Paweł, Sun Qiang
Materials Genome Institute, Shanghai University, 200444 Shanghai, China.
Department of Theoretical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, 20-031 Lublin, Poland.
ACS Nano. 2023 Oct 24;17(20):20194-20202. doi: 10.1021/acsnano.3c05945. Epub 2023 Oct 3.
Materials with disordered structures may exhibit interesting properties. Metal-organic frameworks (MOFs) are a class of hybrid materials composed of metal nodes and coordinating organic linkers. Recently, there has been growing interest in MOFs with structural disorder and the investigations of amorphous structures on surfaces. Herein, we demonstrate a bottom-up method to construct disordered molecular networks on metal surfaces by selecting two organic molecule linkers with the same symmetry but different sizes for preparing two-component samples with different stoichiometric ratios. The amorphous networks are directly imaged by scanning tunneling microscopy under ultrahigh vacuum with a submolecular resolution, allowing us to quantify its degree of disorder and other structural properties. Furthermore, we resort to molecular dynamics simulations to understand the formation of the amorphous metal-organic networks. The results may advance our understanding of the mechanism of formation of monolayer molecular networks with structural disorders, facilitating the design and exploration of amorphous MOF materials with intriguing properties.
具有无序结构的材料可能展现出有趣的特性。金属有机框架（MOF）是一类由金属节点和配位有机连接体组成的杂化材料。近来，人们对具有结构无序的MOF以及表面非晶结构的研究兴趣日益浓厚。在此，我们展示了一种自下而上的方法，通过选择两个具有相同对称性但不同尺寸的有机分子连接体来制备具有不同化学计量比的两组分样品，从而在金属表面构建无序分子网络。在超高真空下，利用扫描隧道显微镜以亚分子分辨率对非晶网络进行直接成像，使我们能够量化其无序程度和其他结构特性。此外，我们借助分子动力学模拟来理解非晶金属有机网络的形成。这些结果可能会增进我们对具有结构无序的单层分子网络形成机制的理解，有助于设计和探索具有有趣特性的非晶MOF材料。
