Abstract
The reaction of [Co-III(TPP)Cl] (TPP is the dianion of 5,10,15,20-tetraphenylporphyrin) with an excess of 4-nitroaniline in dichloromethane leads to the title compound, [Co-III (C44H28N4)(C6H6N2O2)(2)]Cl center dot CH2Cl2. The Co-III ion lies on an inversion centre and is octahedrally coordinated by two N atoms of the NH2 groups of the two 4-nitroaniline transaxial ligands and four pyrrole N atoms of the porphyrin. The asymmetric unit contains one half of the [Co-III (TPP)(4-nitroaniline)(2)](+) ion complex, one chloride counterion (lying on a twofold rotation axis) and one half dichloromethane solvent molecule, where the C atom lies on a twofold rotation axis. The average equatorial Co-N(pyrrole) distance (CoNp) is 1.982 (2) angstrom and the axial Co-N(4-nitroaniline) bond length
is 2.006 (2) angstrom. The crystal packing is stabilized by an N-H center dot center dot center dot Cl hydrogen bond between the N atom of the amino group of the 4-nitroaniline axial ligand and the chloride counter- ion. The supramolecular architecture is further stabilized by weak C-H center dot center dot center dot pi interactions.