Syntheses, Structures, and Properties of Four Metal–Organic Frameworks Based on a N-Centered Multidentate Pyridine-Carboxylate Bifunctional Ligand

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• 作者：Xiangjing Gao ; Mengxi Zheng ; Ling Qin ; Kang Shen ; Hegen Zheng
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：16
• 期：8
• 页码：4711-4719
• 全文大小：679K
• 年卷期：0
• ISSN：1528-7505

文摘

Four new metal–organic frameworks have been synthesized under hydrothermal conditions by the self-assembly of a N-centered multidentate bifunctional ligand (H₂L: 4,4′-((4-(pyridin-4-yl)phenyl)azanediyl)dibenzoic acid) with different N-containing heterocyclic coligands (BIMB = 4,4′-bis((imidazol-1-yl)methyl)biphenyl, BPY = 4,4′-bipyridine, BIP = 1,4-bis(imidazol-1-yl)phenyl) and transition metal salts (Co(NO₃)₂·6H₂O, Zn(NO₃)₂·6H₂O). They are [Co(L)(BIMB)_0.5(H₂O)]·2DMF (1), [Co(L)(BPY)_0.5(H₂O)₂]·3DMF·2H₂O (2), [Zn₂(L)₂]·4DMF·3H₂O (3), and [Zn₂(L)₂(BIP)]·2DMF·2H₂O (4). Compound 1 is an infrequent 3,4-connected self-penetration three-dimensional (3D) architecture. Compound 2 has been classified as a trinodal (3,4,4)-connected 3D sqc69 framework. Compound 3 displays a 2-fold interpenetrating 3D net based on the [Zn₂(CO₂)₄] units which are connected by L^2– ligands. For compound 4, the larger potential voids lead to a 4-fold interpenetration, which can be classified as type IIIa. In addition, their thermal stability, the adsorption isotherms, and optical properties have been studied in detail.