5,10,15,20-TETRAKIS(P-CHLOROPHENYL)-PORPHYRIN

The title molecule, (4-chloro-phenyl)-21,22,23,24-tetraazapentacyclo[I 6.2. osa-1,3(22),4,6,8,10,12,14,16(4),17,-19-undecaene, is crystallog raphically centrosymmetric and the dihedral angle between the two pyrr ole ring planes is 5.0 (4)-degrees . The molecular structure is a cons equence of steric hinderances between the a-H atoms of the pyrrole and the ortho-H atoms of the phenyl rings. The dihedral angles between th e pyrrole and phenyl rings are 54.8 (4) and 111. 1 (3)-degrees, respec tively. The sums of the angles around meso-C atoms are -360-degrees an d the average bond length between meso and adjacent macrocyclic ring C atoms is 1.398 (6) angstrom.