Acta Cryst. (2012). E68, m1497-m1498 [ doi:10.1107/S1600536812046508 ]
Abstract: In the mononuclear title salt, (C5H6N)2[Cu(C5H2N2O4)2(H2O)2]·2H2O, the CuII ion is located on an inversion centre and is coordinated by two chelating pyrazole-3,5-dicarboxylate anions and two water molecules, forming a Jahn-Teller-distorted CuN2O4 octahedron. O-HO and N-HO hydrogen bonds are formed between water molecules, complex anions and the pyridine counter-cations, leading to the formation of layers parallel to (100). The layers are held together by weak C-HO hydrogen bonds.
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