Reversible Solid-state Structural Transformation of a 1D-2D Coordination Polymer by Thermal De/Rehydration Processes
Resource
INORGANIC CHEMISTRY, 50(2), 597-603
Journal
INORGANIC CHEMISTRY
Journal Volume
50
Journal Issue
2
Pages
597-603
Date Issued
2011
Date
2011
Author(s)
Wang, Chih-Chieh
Yang, Ching-Chun
Yeh, Chang-Tsung
Cheng, Kum-Yi
Chang, Pei-Chen
Ho, Mei-Lin
Lee, Gene-Hsiang
Shih, Wei-Ju
Sheu, Hwo-Shuenn
Abstract
A new coordination polymer, [Zn(HBTC)(BPE)0.5(H2O)]n�PnH2O (1) with an extended 1D ladderlike metal-organic 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-) ligands and one coordinated water molecule. The HBTC(2-) 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 Zn(II) 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-H �P �P �P O hydrogen bond between the carboxylic group and carboxylate group of interladder HBTC(2-) ligand. Adjacent 2D layers are then packed orderly in an ABAB-type array via the intermolecular interactions of combined �k-�k interaction and O-H �P �P �P 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 HBTC(2-) 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.
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journal article
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