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In the mononuclear title salt, (C5H6N)2[Cu(C5H2N2O4)2(H2O)2]·2H2O, the Cu(II) ion is located on an inversion centre and is coordinated by two chelating pyrazole-3,5-dicarboxyl-ate anions and two water mol-ecules, forming a Jahn-Teller-distorted CuN2O4 octa-hedron. O-H⋯O and N-H⋯O hydrogen bonds are formed between water mol-ecules, complex anions and the pyridine counter-cations, leading to the formation of layers parallel to (100). The layers are held together by weak C-H⋯O hydrogen bonds.

Dipyridinium diaquabis(pyrazole-3,5-dicarboxylato-κ2N,O)cuprate(II) dihydrate

Dipyridinium diaquabis(pyrazole-3,5-dicarboxylato-κ²N,O)cuprate(II) dihydrate