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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...
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