Reversible Solid-State Structural Transformation of a 1D鈭?D Coordination Polymer by Thermal De/Rehydration Processes

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• 作者：Chih-Chieh Wang ; Ching-Chun Yang ; Chang-Tsung Yeh ; Kum-Yi Cheng ; Pei-Chen Chang ; Mei-Lin Ho ; Gene-Hsiang Lee ; Wei-Ju Shih ; Hwo-Shuenn Sheu
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：January 17, 2011
• 年：2011
• 卷：50
• 期：2
• 页码：597-603
• 全文大小：928K
• 年卷期：v.50,no.2(January 17, 2011)
• ISSN：1520-510X

文摘

A new coordination polymer, [Zn(HBTC)(BPE)_0.5(H₂O)]_n路nH₂O (1) with an extended 1D ladderlike metal鈭抩rganic framework (MOF) has been synthesized and structural characterized by single-crystal X-ray diffraction method. Structural determination reveals that, in compound 1, the Zn(II) ion is four-coordinated in a distorted tetrahedral geometry, bonded to one nitrogen atom from one BPE ligand, and three oxygen atoms from two monodentate carboxylate groups of two HBTC^{2鈭?/sup> ligands and one coordinated water molecule. The HBTC2鈭?/sup> acts as a bridging ligand with a bis-monodentate coordination mode, connecting the Zn(II) ions to form a one-dimensional (1D) [Zn(HBTC)] chain. Two 1D chains are then interlinked via the connectivity between the ZnII ions and anti-BPE liagnds to complete the 1D ladderlike MOF. Adjacent 1D Ladders are further extended to a 2D hydrogen-bonded layered network through the intermolecular O鈭扝路路路O hydrogen bond between the carboxylic group and carboxylate group of interladder HBTC2鈭?/sup> ligand. Adjacent 2D layers are then packed orderly in an ABAB-type array via the intermolecular interactions of combined 蟺鈭捪€ interaction and O鈭扝路路路O hydrogen bonds to form a 3D supramolecular architecture exhibiting 1D channels intercalated with guest water molecules. The reversible solid-state structural transformation between crystalline 1 with 1D ladderlike framework and its dehydrated powder 2, [Zn(HBTC)(BPE)_0.5]_n, with 2D framework via the displacement of coordinated water molecule to HBTC2鈭?/sup> ligand, by thermal de/rehydrated processes has been verified by PXRD measurements. The emission of 1 and 2 is ascribed to a ligand-based transition.}