Coordination polymers constructed by diverse metal centers and the rigid ligand 3,5-di(1H-imidazol-1-yl)pyridine: Synthesis, structure and properties

Six new coordination polymers, [Cu(L)2(H2O)2](NO3)2 (1), [Cu(L)2](ClO4)2 (2), [Cd(L)2(H2O)2](ClO4)2 (3), [Cd(L)(OAc)2(H2O)] (4), [Cu3(L)4(H2O)2(SO4)](SO4)2·30H2O (5), and [Ni(L)(H2O)3(SO4)] (6) [L = 3,5-di(1H-imidazol-1-yl)pyridine, OAc− = CH3COO−], have been prepared and characterized by X-ray diffraction, IR, elemental and thermogravimetric analyses. Complexes 1, 4 and 6 have different one-dimensional (1D) chain structures, while 2 and 4 are two-dimensional (2D) networks. The chains and layers are further linked together by hydrogen bonds to generate three-dimensional (3D) frameworks. Complex 5 is a (3,4,4)-connected 3D framework with a Point (Schläfli) symbol of (4.82)4(4.83.102)2(42.82.102). The influences of the coordination modes of the ligand L, metal center as well as the counteranion on the structures of the complexes are discussed. Furthermore, the reversible anion exchange property of 3 and the photoluminescence properties of 3 and 4 have been investigated.

Six new coordination polymers with the 3,5-di(1H-imidazol-1-yl)pyridine ligand and different metal centers have been prepared and characterized by X-ray diffraction, IR, elemental and thermogravimetric analyses. The complexes show diverse 1D, 2D and 3D structures. The reversible anion exchange and photoluminescence properties of the complexes were investigated.Figure optionsDownload as PowerPoint slideHighlights
► Coordination framework.
► Complexes with the 3,5-di(1H-imidazol-1-yl)pyridine ligand.
► Anion exchange and photoluminescence properties of the complexes.