Cyclopentaneteracarboxylic Metal–Organic Frameworks: Tuning the Distance between Layers and Pore Structures with N-Ligands

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• 作者：Qingxiang Yang ; ShuangShuang Ren ; Ying Hao ; Qianqian Zhao ; Zhijun Chen ; Hegen Zheng
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：May 16, 2016
• 年：2016
• 卷：55
• 期：10
• 页码：4951-4957
• 全文大小：576K
• 年卷期：0
• ISSN：1520-510X

文摘

Five new isomorphic coordination polymers of the Co(II) ion, namely, {[Co₂L(bpy)_0.5(H₂O)₂]·2H₂O}_n (1), {[Co₂L(pbyb)_0.5(H₂O)₂]·3H₂O}_n (2), {[Co₂L(dpe)_0.5(H₂O)₂]·2H₂O}_n (3), {[Co₂L(dpa)_0.5(H₂O)₂]·2.5H₂O}_n (4), and {[Co₂L(dip)_0.5(H₂O)₂]·3.5H₂O}_n (5) (H₄L = cis,cis,cis,cis-1,2,3,4-cyclopentaneteracarboxylic acid, bpy = 4,4′-bipyridine, pbyb = 1,4-di(pyridine-4-yl)benzene, dpe = 1,2-di(pyridine-4-yl)ethane, dpa = (E)-1,2-di(pyridin-4-yl)diazene, and dip = 1,4-di(1H-imidazol-1-yl)benzene), have been synthesized under hydrothermal conditions. The L^4– ligand maintains its original conformation of SSRR in all of these compounds, but {Co₅L}_n clusters show mirror coordination symmetry in 1, 2, and 4 while the clusters in 3 and 5 do not. The addition of different N-ligands can tune the distance between {Co₂L}_n layers and change the pore structures of the frameworks. Magnetic susceptibility measurements indicate that 1–5 exhibit antiferromagnetic behavior.