(2,3,7,8,12,13,17,18-Octa­ethyl­porphyrinato-κ⁴N)cobalt(II)–2-nitro­benzaldehyde (1/2)

The asymmetric unit of the title compound, [Co(C₃₆H₄₄N₄)]·2C₇H₅NO₃, is composed of one half of the complex, arranged about an inversion center, and a complete 2-nitro­benzaldehyde (NBA) mol­ecule. The structure consists of columns that contain inter­leaved mol­ecules of NBA and [Co^II(OEP)] (OEP is 2,3,7,8,12,13,17,18-octa­ethyl­porphyrin), which are stacked along the a axis. The Co^II atom is involved in a π inter­action with the ring of the NBA mol­ecule with a centroid–metal distance of 3.508 (6) Å. There is an intra­molecular C—H...O hydrogen bond in the NBA mol­ecule.