Liu Hui-Yan, Wang Kang, Sun Yi, Wang Rui, Wang Hai-Ying
School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, People's Republic of China.
Inorg Chem. 2020 Jul 6;59(13):9452-9460. doi: 10.1021/acs.inorgchem.0c01537. Epub 2020 Jun 22.
Six cobalt-organic frameworks (-) were solvothermally constructed with a tritopic pyridine-carboxylate linker (L-H) and its methyl- and methoxy-functionalized derivatives (L-OCH and L-CH). Due to incorporated multiple substituents with various steric hindrances, the tritopic linkers adopt different molecular configurations, Y-shaped and T-shaped, which further combine octahedral or trigonal-prismatic inorganic nodes to afford diverse (3,6)-connected nets. Consequently, and are nets and and are nets. Notably, and present rarely observed chiral (flu-3) networks with left-handed double helical chains. The structural investigation indicates that the steric tuning of linkers may essentially dictate the resulting diverse MOF structures. Furthermore, the MOFs presented here can be regarded as an ideal structural platform for a better understanding of the assembly of (3,6)-connected , , and chiral nets, which are closely related to the shape and geometric configuration/conformation of tridentate organic nodes as well as inorganic building nodes.
六种钴有机框架（-）通过三齿吡啶羧酸酯连接体（L-H）及其甲基和甲氧基官能化衍生物（L-OCH和L-CH）溶剂热合成。由于引入了具有不同空间位阻的多个取代基，三齿连接体采用不同的分子构型，即Y形和T形，它们进一步与八面体或三棱柱无机节点结合，形成多样的（3,6）连接网络。因此， 和 是 网络，而 和 是 网络。值得注意的是， 和 呈现出罕见的具有左手双螺旋链的手性 （flu-3）网络。结构研究表明，连接体的空间调控可能从根本上决定最终多样的金属有机框架结构。此外，这里展示的金属有机框架可被视为一个理想的结构平台，用于更好地理解（3,6）连接的 、 和手性 网络的组装，这些网络与三齿有机节点以及无机构建节点的形状和几何构型/构象密切相关。
