Crystal and molecular structure of 6,13-Di(ethoxycarbonyl)-7,12-dimethyl-dibenzo [b.i.]-1,4,8,11-tetraaza[14]annulenato(2-) nitrosocobaltat [C26H26O5N5Co] and the neutral ligand [C26H28O4N4]

Both title compounds crystallize in the orthorhombic space group Pnma with 4 formular units in the unit cell. The lattice parameters are: C₂₆H₂₆O₅N₅Co], a = 8.589(4), b = 19.395(3), and c = 14.850(3) Å;C₂₆H₂₈O₄N₄], a = 8.413(7), b = 19.166(4), and c = 14.807(28) Å. The crystal structures have been determined by direct methods and refined by full-matrix least square calculations. The ligands have a pronounced saddle-shaped conformation in each structure because of interactions of the methyl groups with the benzene rings. The overall conformations of the neutral ligand and the cobalt complex are remarkably similar.