Three interpenetrated frameworks constructed by long flexible N,N′-bipyridyl and dicarboxylate ligands |
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| Authors: | Xiao-Ju Li Rong Cao Wen-Hua Bi Yan-Qin Wang Yu-Ling Wang Xing Li |
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| Institution: | State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yangqiao West Road 155, Fujian, Fuzhou 350002, China |
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| Abstract: | Three interpenetrated polymeric networks, {Co(bpp)(OH-BDC)] · H2O}n (1) Ni(bpp)1.5(H2O)(OH-BDC)]n (2) and {Cd(bpp)(H2O)(OH-BDC)] · 2H2O}n (3), have been prepared by hydrothermal reactions of 1,3-bis(4-pyridyl)propane (bpp), 5-hydroxyisophthalic acid (OH-H2BDC), with Co(NO3)2 · 6H2O, Ni(NO3)2 · 6H2O and Cd(NO3)2 · 4H2O, respectively. Single-crystal X-ray diffraction analyses reveal that the three compounds all exhibit interpenetrated but entirely different structures. Compound 1 is a fourfold interpenetrated adamantanoid structure with water molecules as space fillers, in which bpp adopts a TG conformation (T = trans, G = gauche). Compound 2 is an interdigitated structure from the interpenetrated long arms of one-dimensional molecular ladders, while bpp in 2 adopts both TT and TG conformations. Compound 3 is a twofold interpenetrated three-dimensional network from a one-dimensional metal-carboxylate chain bridged by TG conformational bpp. The hydrogen bonding interactions in 1–3 further stabilize the whole structural frameworks and play critical roles in their constructions. |
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| Keywords: | Cobalt(II) Nickel(II) Cadmium(II) X-ray diffraction Interpenetrated |
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