Citation:
SUN Yun-Kai, XIE Rui, WANG Xiao-Feng, WEN Ge-Bo, LIN Ying-Wu. Steric Effect Modulating the Structures of Trinuclear Zinc Carboxylate Frameworks[J]. Chinese Journal of Structural Chemistry,
;2016, 35(9): 1413-1419.
doi:
10.14102/j.cnki.0254-5861.2011-1124
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By the reaction of different aromatic dicarboxylic acid with zinc nitrate, three metal-carboxylate frameworks,[Zn3(BDC)3(EtOH)2](1),[Zn3(BDC)3(py)2]·2DMF(2), and[Zn3(NH2-BDC)3(H2O)2]·5DMF(3) which are constructed on the same linear trinuclear Zn3(RCOO)6 secondary building units, have been synthesized and characterized by X-ray diffraction analyses. Structural analyses showed that there are terephthalic acids as ligand linkers to form the hxl topological layer structures for 1 and 2. The introduction of the rigid aromatic ring pyridine in 2 as the terminal co-ligand of Zn3-SBU to instead of the flexible ethanol in 1, will form the layer-pillared supramolecular systems with 2-D crisscross channels, through its π-π stacking interactions. Owing to the steric hindrance of amino groups, 3 was assembled into a three-dimensional porous structure with pcu topology derived from the 2-amino-terephthalic acid as linkers to connect the Zn3-SBUs through a head-to-tail type.
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Keywords:
- zinc(Ⅱ),
- metal-carboxylate framework,
- steric effect,
- crystal structure
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