1D and 2D Homochiral Metal-Organic Frameworks Built from a New Chiral Elongated Binaphthalene-Derived Bipyridine

Six homochiral coordination polymers 1−6 based on a new enantiopure elongated (S)-2,2‘-diethoxy-1,1‘-binaphthyl-6,6‘-bis(4-vinylpyridine) ligand (L) and divalent metal (Zn, Cd, and Ni) connecting points were synthesized and
characterized by single-crystal X-ray diffraction studies. These new homochiral coordination polymers adopt two
distinct framework structures:  a one-dimensional infinite chain structure with bridging L ligands occupying the axial
positions of the metal centers and a two-dimensional rhombic grid structure formed by linking octahedrally coordinated
metal centers with four pyridyl groups of bridging L ligands in the equatorial positions. The structures of these
coordination polymers are sensitive to the nature of the anions as well as the solvents from which the coordination
polymer crystals were grown. Powder X-ray diffraction studies showed that the two-dimensional chiral rhombic
grids exhibited porosity, which could potentially find applications in enantioselective separations and catalysis.

本研究合成了6种同手性配位聚合物1~6，其以一种对映纯的加长型(S)-2,2'-二乙氧基-1,1'-联萘-6,6'-二(4-乙烯基吡啶)配体（L）以及Zn、Cd、Ni三种二价金属配位节点为构筑基元，并通过单晶X射线衍射分析完成了结构表征。该类新型同手性配位聚合物存在两种不同的骨架结构：一种为一维无限链结构，桥联配体L占据金属中心的轴向配位位点；另一种为二维菱形网格结构，由八配位金属中心与桥联配体L的四个吡啶基团在赤道位置配位连接形成。此类配位聚合物的结构对阴离子种类以及晶体生长所用溶剂的性质均具有敏感性。粉末X射线衍射研究表明，该二维手性菱形网格结构具备孔隙性，在对映选择性分离与催化领域具有潜在的应用价值。