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Issue 6, 2011
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Assembly of two Zinc(II)-squarate coordination polymers with noncovalent and covalent bonds derived from flexible ligands, 1,2-bis(4-pyridyl)ethane (dpe)

Chih-Chieh Wang,*a  Wen-Chun Chung,a  Hui-Wun Lin,a  Shuen-Chieh Dai,a  Jia-Shiuan Shiu,a  Gene-Hsiang Lee,b  Hwo-Shuenn Sheuc  and  William Leed 
Author affiliations

* Corresponding authors

a Department of Chemistry, Soochow University, Taipei, Taiwan
E-mail: ccwang@mail.scu.edu.tw
Fax: 886-2-28811053

b Instrumentation Center, National Taiwan University, Taipei, Taiwan

c National Synchrotron Radiation Research Center, Hsinchu, Taiwan

d School of Occupational Safety and Health, Chung Shan Medical University, Taichung, Taiwan

Abstract

Two metal–organic frameworks (MOFs) based on Zn(II)-squarate bridges associated with non-covalent and covalent bonds of dpe ligands, [Zn(dpe)(C4O4)(H2O)2]n (1), and {[Zn(Hdpe)(C4O4)0.5(H2O)3][Zn(C4O4)2(H2O)2]}n (2) (C4O42− (squarate) = dianion of 3,4-dihydroxycyclobut-3-ene-1,2-dione (H2C4O4); dpe = 1,2-bis(4-pyridyl)ethane), have been synthesized and characterized by spectroscopic analysis and single-crystal X-ray diffraction studies. Compound 1 is a two-dimensional (2D) metal–organic framework (MOF), being constructed via the crosslinkage of one-dimensional (1D) [Zn(μ1,3-squarate)] chains and 1D sinusoidal-like [Zn(gauche-dpe)] chains. Compound 2 is a 2D tri-layered composite network composed of one cationic polythreading [Zn(Hdpe)(C4O4)0.5(H2O)3]2+ MOF and two anionic [Zn(C4O4)2(H2O)2]2− MOFs with the penetration of the monoprotonated anti-form Hdpe+ ligands dangling above and below the 2D Zn(II)-(μ1,2,3,4-squarate) layer of cationic [Zn(Hdpe)(C4O4)0.5(H2O)3]2+ MOF into the windows of two 2D Zn(II)-(μ1,3-squarate) layers of anionic [Zn(C4O4)2(H2O)2]2− MOFs. Both of their 2D MOFs in compounds 1 and 2 are then extended to 3D supramolecular architectures via the intermolecular hydrogen bonding interaction among the squarate, protonated dpe ligands and water molecules.

Graphical abstract: Assembly of two Zinc(ii)-squarate coordination polymers with noncovalent and covalent bonds derived from flexible ligands, 1,2-bis(4-pyridyl)ethane (dpe)

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Publication details

The article was received on 15 Sep 2010, accepted on 25 Nov 2010 and first published on 17 Jan 2011


Article type: Paper
DOI: 10.1039/C0CE00644K
Citation: CrystEngComm, 2011,13, 2130-2136
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    Assembly of two Zinc(II)-squarate coordination polymers with noncovalent and covalent bonds derived from flexible ligands, 1,2-bis(4-pyridyl)ethane (dpe)

    C. Wang, W. Chung, H. Lin, S. Dai, J. Shiu, G. Lee, H. Sheu and W. Lee, CrystEngComm, 2011, 13, 2130
    DOI: 10.1039/C0CE00644K

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