Hydrothermal Syntheses and Characterizations of Three ZnII Coordination Polymers Tuned by pH Value and Base |
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| Authors: | Lu‐Fang Ma Bo Li Xiao‐Yuan Sun Li‐Ya Wang Dr Yao‐Ting Fan |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan 471022, P. R. China;2. Department of Chemistry, Zhengzhou University, Zhengzhou, Henan, P. R. China |
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| Abstract: | Three new ZnII coordination polymers, Zn(bpe)(HL)2(H2O)]n ( 1 ), {Zn(bpe)(L)] · H2O}n ( 2 ), and Zn2Ca(bpe)(HL)2(L)2]n ( 3 ) H2L = 5‐methoxyisophthalic acid and bpe = 1,2‐dis(4‐pyridyl) ethylene], were hydrothermally synthesized under different pH values and bases. Their structures were determined by single‐crystal X‐ray diffraction and further characterized by elemental analyses and IR spectroscopy. Polymer 1 is formed at pH = 4 and has a 1D chain structure. These 1D chains are linked by hydrogen bonds to afford a 1D double chain and further to form a threefold interpenetrating network. At pH = 7, a 2D layer structure of 2 with sql topology is formed. By using calcium hydroxide as base for the synthesis of 3 , a 3D network with pcu topology is obtained. These structural differences among 1 – 3 indicate that pH value and the identity of the base play important role in defining the overall structures of metal‐organic frameworks. In addition, the fluorescent properties of 1 – 3 are discussed. |
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| Keywords: | Zinc Metal‐organic frameworks Hydrothermal synthesis pH value Fluorescence |
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