Bis[4-amino-3,5-bis(pyridin-2-yl)-4H-1,2,4-triazole-κ2N2,N3]bis(benzene-1,2-dicarboxylic acid-κO)copper(II) bis(2-carboxybenzoate)

In the complex cation of the title salt, [Cu(C12H10N6)2(C8H6O4)2](C8H5O4)2, the CuII atom, lying on an inversion center, exhibits a distorted octahedral geometry defined by four N atoms from two 4-amino-3,5-bis(pyridin-2-yl)-4H-1,2,4-triazole ligands in the equatorial plane and two axial O atoms from two benzene-1,2-dicarboxylic acid ligands. In the crystal, the complex cations and the monodeprotonated 2-carboxybenzoate anions are connected by O—H...O and N—H...O hydrogen bonds, forming a tape along [100]. Adjacent tapes are further linked into a three-dimensional arrangement via π–π stacking interactions between the triazole and benzene rings and between the pyridine and benzene rings [centroid–centroid distances = 3.6734 (14)/3.9430 (16) and 3.8221 (14) Å]. Intramolecular N—H...N and O—H...O hydrogen bonds are also observed.

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