Synthesis and Crystal Structures of Alkali and Alkaline Earth Metal Complexes of 3,5-Dinitropyrazolyl-4-carboxylate |
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Authors: | Lili Guo Xing-Pu Lv Jing-Huo Chen Wenhua Zhang Guang Yang |
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Institution: | Green Catalysis Center and College of Chemistry, Zhengzhou University, 450001 Zhengzhou, Henan, P. R. China |
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Abstract: | The synthesis and crystal structures of 3,5-dinitro-1H-pyrazolyl-4-carboxylic acid (H2dnpzc) and its four complexes with Ca2+, Ba2+, Na+ and K+ are reported in this paper. Ca(dnpzc) · 5H2O exhibits a 1D polymeric structure, whereas Ba(dnpzc) · 4H2O possesses a 2D structure. The structure of Na2(dnpzc) · 4H2O consists of 2D layers of Na(dnpzc)]–n and 1D chains of Na(H2O)3]+n. K2(dnpzc) · H2O has a true 3D structure. It was observed that the doubly deprotonated ligand (dnpzc2–) can act as a versatile bridge to form polymeric structures by varying combinations of its 8 potential donor atoms (two carboxy O atoms, two pyrazolyl N atoms and four nitro O atoms). Particularly in the structure of K2(dnpzc) · H2O, all the 8 donor atoms of dnpzc2– take part in the coordination and as many as 10 potassium atoms are connected by one ligand. |
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Keywords: | Alkali metal Alkaline earth metals 3 5-Dinitro-1H-pyrazolyl-4-carboxylic acid Structure elucidation Coordination polymer |
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