Molecular Tectonics of Four-Connected Network Topologies by Regulating the Ratios of Tetrahedral and Square-Planar Building Units

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• 作者：Ling Qin ; Hai-Lang Jia ; Zi-Jian Guo ; He-Gen Zheng
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：December 3, 2014
• 年：2014
• 卷：14
• 期：12
• 页码：6607-6612
• 全文大小：484K
• ISSN：1528-7505

文摘

Assembly of the 4-connected building units leads to three three-dimensional frameworks, {[Cd(TPPBDA)(OH)₂]路2H₂O路4DMA}_n (1), {[Cd(TPPBDA)_1/2(tpdc)]路DMF}_n (2), and {[Zn(TPPBDA)_1/2(bpdc)]路3H₂O路3DMF}_n (3) (TPPDBA = N,N,N鈥?N鈥?tetrakis(4-(4-pyridine)-phenyl) biphenyl-4,4鈥?diamine, H₂tpdc = 4,4鈥?dicarboxyl-(1,1鈥?3鈥?1鈥?-terphenyl), H₂bpdc = biphenyldicarboxylic acid, DMF = N,N-dimethylformamide, DMA = N,N-dimethylacteamide), which are based on different ratios of tetrahedral (T) and square-planar (S) building units. For compound 1, T and S nodes are in the ratio of 1:1, which is the feature of pts. While T/S is 2:1 in compound 2 to form a bbf framework, for compound 3, the TPPBDA ligand and the metal center are both in tetrahedral configuration, which constructs a dia net with the ratio of 2:0 (T/S). In addition, the compound 2 exhibits high selectivity for CO₂ over CH₄, showing a hysteretic sorption鈥揹esorption loop.