(2-Acetylphenolato)(2,2′-bipyridine)nitratocopper(II)

In the title compound, [Cu(C8H7O2)(NO3)(C10H8N2)], the CuII ion is five-coordinate in a distorted square-pyramidal geometry. The basal positions are occupied by two N atoms from a 2,2′-bipyridine ligand and two O atoms from the 2-acetylphenolate anion. The axial position is occupied by one O atom of a nitrate anion. In the bipyridine ligand, the two pyridine rings are slightly twisted by an angle of 3.5 (1)°. The crystal structure is stabilized by C—H⋯O hydrogen bonds

In the title compound, [Cu(C 8 H 7 O 2 )(NO 3 )(C 10 H 8 N 2 )], the Cu II ion is five-coordinate in a distorted square-pyramidal geometry. The basal positions are occupied by two N atoms from a 2,2 0 -bipyridine ligand and two O atoms from the 2acetylphenolate anion. The axial position is occupied by one O atom of a nitrate anion. In the bipyridine ligand, the two pyridine rings are slightly twisted by an angle of 3.5 (1) . The crystal structure is stabilized by C-HÁ Á ÁO hydrogen bonds
In the title compound, the Cu II ion is in a distorted square-pyramidal geometry ( Fig. 1 and Table 1). The four basal positions are occupied by two N donor atoms from a 2,2 ' -bipyridine ligand and two O atoms from the 2-acetylphenolate anion. The axial position is occupied by one O atom of a nitrate anion. The Cu1 atom is displaced from the O1/O2/N1/N2 basal plane toward the O3 atom by 0.1472 (3) Å. In the pipyridine ligand, the two pyridine rings are twisted slightly by an angle of 3.5 (1)°. The N1-and N2-pyridine rings form dihedral angles of 16.2 (1) and 15.6 (1)°, respectively, with the benzene ring.
The crystal structure is stabilized by C-H···O hydrogen bonds (Table 2).

Experimental
The crystal used in this structure determination was obtained adventitiously from an attempted preparation of a copper(II)-Schiff base complex. It was synthesized as described in the literature (Plesch et al., 1997). 2-Hydroxyacetophenone (1.00 mmol) in methanol (10 ml) was added dropwise to a soltion of beta-alaine (1.00 mmol) and potassium hydroxide (1.00 mmol) in methanol (10 ml). The yellow solution was stirred for 2 h at 333 K. The resultant mixture was added dropwise to copper(II) nitrate trihydrate (1.00 mmol) and 2,2 ' -bipyridine (1.00 mmol) in an aqueous methanolic solution (20 ml, 1:1 v/v), and heated with stirring for 2 h at 333 K. The dark blue solution obtained was filtered and left for several days; dark blue crystals were formed which were filtered off, washed with water, and dried under vacuum.

Refinement
H atoms were positioned geometrically and refined as riding, with C-H = 0.93 (CH) or 0.96 Å (CH 3 ) and U iso (H) = xU eq (C,N), where x = 1.5 for methyl H atoms and 1.2 for other H atoms. Fig. 1. The molecular structure of the title compound, showing 50% probability displacement ellipsoids and the atom-numbering scheme.