Poly[bis-(μ(2)-4,4'-bipyridine)bis-(3-nitro-benzoato)cobalt(II)]

Abstract

The hydro-thermal reaction of cobalt nitrate with 4,4'-bipyridine and 3-nitro-benzoic acid lead to the formation of the title complex, [Co(C(7)H(4)NO(4))(2)(C(10)H(8)N(2))(2)](n). In the crystal structure, the Co(II) atoms are coordinated by two terminal carboxyl-ate anions and four 4,4'-bipyridine ligands within slightly distorted octa-hedra. The Co(II) atom and one of the two independent 4,4'-bipyridine ligands are located on a twofold rotation axis, while the second independent 4,4'-bipyridine mol-ecule is located on a centre of inversion. One of the two rings of one 4,4'-bipyridine ligand is disordered over two orientations and was refined using a split model [occupancy ratio 0.68 (2):0.32 (2)]. The Co(II) atoms are connected by the 4,4'-bipyridine ligands into layers, which are located parallel to the ab plane.

Fig. 1.

Crystal structure of the title compound with labeling and displacement ellipsoids drawn at the 50% probability level. [symmetry codes: (i) -x + 1,y,-z + 5/2; (ii) x,y - 1,z; (iii) -x + 1,y + 1,-z + 5/2; (iv) -x + 1/2,-y + 5/2,-z + 2.]. The H atoms are omitted for clarity.

Fig. 2.

Crystal structure of the title compound in c-direction showing the layers. The H atoms and the disordered C atoms are not shown for clarity.