Abstract
In the title complex, [Cu(C6H4O2N)2]·2C9H6O6·2H2O, the Cu2+ ion lies on a center of inversion and coordinates with symmetry related pyridine nitro-gen and carboxyl oxygen atoms from two pyridine-2-carb-oxy-lic acid anions, giving rise to a square-planar coordination geometry. There are weak axial bonds between Cu and an O atom of a symmetry-related trimesic acid moieties [Cu⋯O = 2.837 (2) Å] The Cu⋯O weak inter-actions and hydrogen bonds stabilize the whole structure.
Highlights
In the title complex, [Cu(C6H4O2N)2]Á2C9H6O6Á2H2O, the Cu2+ ion lies on a center of inversion and coordinates with symmetry related pyridine nitrogen and carboxyl oxygen atoms from two pyridine-2-carboxylic acid anions, giving rise to a square-planar coordination geometry
The Cu2+ ion lies on the symmetry center and is coordinated by two symmetry-related pyridine nitrogen atoms and two symmetry-related carboxyl oxygen atoms, giving rise to a square-planar coordination geometry
Symmetry codes: (i) −x, −y, −z; (ii) x−1, y−1, z; (iii) −x+1, −y, −z; (iv) x+1, y+1, z; (v) −x+1, −y+1, −z; (vi) x−1, y−1, z−1
Summary
The asymmetric unit of the title compound contains half copper center, one pyridine-2carboxylic acid anion, one BTC (benzene-1,3,5-tricarboxylic acid) ligand and one crystal water molecule (Fig. 1). The Cu2+ ion lies on the symmetry center and is coordinated by two symmetry-related pyridine nitrogen atoms and two symmetry-related carboxyl oxygen atoms, giving rise to a square-planar coordination geometry. The 1,4-bis(3pyridyl)-2,3-diaza-1,3-butadiene ligand decomposed during the hydrothermal process and is oxidized into pyridine-2-carboxylic acid. Each pyridine-2-carboxylic acid anion coordinates with one Cu2+ ion in a bidentate N,Ochelated mode, forming a five-membered ring.
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