Synthesis, Characterization, and Luminescence Modulation of a Metal-Organic Framework Based on a Cyclotriphosphazene-Functionalized Multicarboxylate Ligand

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• 作者：Yajing Ling ; Huiming Liu ; Jingjing Jiao ; Yunlong Feng and Yabing He
• 刊名：ChemPlusChem
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：81
• 期：8
• 页码：786-791
• 全文大小：1237K
• ISSN：2192-6506

文摘

By using a multicarboxylate ligand consisting of six peripheral 1,3-benzenedicarboxylalte units connected to the central cyclotriphosphazene ring through a P−O−C spacer, a novel metal–organic framework, [Cd₅L(H₂O)₄]⋅2 (CH₃)₂NH₂⋅6 DMF (L=hexakis(3,5-dicarboxylatephenyloxy)cyclotriphosphazene), was solvothermally synthesized and characterized by single-crystal and powder XRD, thermal gravimetric analysis, and IR and photoluminescence spectroscopy. Single-crystal XRD analyses show that the framework is an anionic 3D network assembled from pentanuclear [Cd₅(COO)₁₀] secondary building units and organic linkers. TOPOS software analyses indicate that two alternative simplifications based on the organic linkers can produce five-connected uninodal bnn-type topology or novel (2,3,6,10)-connected five-nodal topology. Additionally, it is interesting that the luminescence intensity of the complex can be modulated by postsynthetic ion exchange. This study highlights that cyclotriphosphazene-functionalized multicarboxylates, with the combined advantages of conformation diversity and easy functionalization, are a promising type of organic ligand for the synthesis of metal–organic frameworks with fascinating structures and interesting properties.