Acta Cryst. (2012). E68, m1497-m1498
[ doi:10.1107/S1600536812046508 ]

Dipyridinium diaquabis(pyrazole-3,5-dicarboxylato-²N,O)cuprate(II) dihydrate

Y. Si

Abstract: 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-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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