Formation of Three New Silver(I) Coordination Polymers Involving 1,2-Phenylenediacetic Acid via the Modulation of Dipyridyl-Containing Ligands

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• 作者：Guo-Ping Yang ; Yao-Yu Wang ; Ping Liu ; Ai-Yun Fu ; Ya-Nan Zhang ; Jun-Cheng Jin ; Qi-Zhen Shi
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：March 3, 2010
• 年：2010
• 卷：10
• 期：3
• 页码：1443-1450
• 全文大小：1006K
• 年卷期：v.10,no.3(March 3, 2010)
• ISSN：1528-7505

文摘

Three new silver(I) metal−organic frameworks (MOFs), namely, [Ag₂(pda)(bipy)₂]_n·4nH₂O (1), [Ag₂(pda)(dpe)₂(H₂O)]_n·4nH₂O (2), and [Ag(Hpda)(bpp)]_n (3), were prepared by hydrothermal reactions of silver(I) acetate with H₂pda (H₂pda = 1,2-phenylenediacetic acid) in the presence of different pyridyl-containing ligands (bipy = 4,4′-bipyridine, dpe = 1,2-di(4-pyridyl)-ethylene, and bpp = 1,2-bis(4-pyridyl)propane) and structurally characterized by single crystal X-ray diffraction. Complex 1 shows a two-dimensional (2D) four-connected network with a long topological vertex Schlfli symbol (4.6₂.4.6₃.6₄.6). Of particular interest, a new unreported octameric water cluster, (H₂O)₈, which is comprised of a cyclic water tetramer and four dangling water monomers, exists in 1. And the pseudorotaxane motifs are formed by these octameric clusters and the [Ag₈(pda)₂(bipy)₄] loops. Complex 2 features a one-dimensional (1D) ladder-like chain structure, and the 2D networks, assembling by the combination of the pentameric water cluster, (H₂O)₅, and pda dianions, are supported by the 1D polymeric chains to form an infinite three-dimensional (3D) supramolecular framework. Complex 3 is a highly puckered 2D (6,3) sheet and further stacks via hydrogen bonding interlocks notated as R₂² (18) to afford a unique 3D 6⁶ topology with a long topological vertex Schlfli symbol of (6.6₂.6.6₂.6.6₂) but which is not a typical diamondoid network. The diverse arrangements of the complexes show the remarkable sensitivity of the Ag^I−H₂pda system to the different dipyridyl ligands; that is to say, the subtle modulation of dipyridyl-containing ligand has a significant effect on the overall MOFs and the coordination modes of H₂pda ligands. In addition, the properties of thermogravimetric analysis−differential scanning calorimetry, X-ray powder diffraction, and photoluminescent behaviors of the complexes have been also discussed.