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 shu

Steric Effect Modulating the Structures of Trinuclear Zinc Carboxylate Frameworks

SUN Yun-Kai ^a ,
XIE Rui ^a ,
WANG Xiao-Feng ^a,b ,
WEN Ge-Bo ^b ,
LIN Ying-Wu ^a,b

1.
a School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China;
2.
b Laboratory of Protein Structure and Function, University of South China, Hengyang, Hunan 421001, China

Received Date: 11 January 2016
Available Online: 7 April 2016
Fund Project: The project was supported by the National Natural Science Foundation of China (No. 11375082, 11305086, 11175080) (No. 11375082, 11305086, 11175080) Science Foundation of Hunan Province Department of Education (No. 12A117) (No. 12A117)the Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (Wang X. F.) (Wang X. F.)

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.
- zinc(Ⅱ),
- metal-carboxylate framework,
- steric effect,
- crystal structure
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