5,10,15,20-Tetra-2-furylporphyrin

5,10,15,20-Tetra-2-furylporphyrin

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Molecules of the title macrocycle, C36H22N4O4, are located on an inversion center.The porphyrin ring shows a wave-like conformation with adjacent pyrrole rings tilted above the porphyrin plane and the interporphyrin distance here is 3.584 (3) Å.The dihedral angles between the meso-furyl groups and the porphyrin plane are 38.

87 (7) and 48.29 (7)°; these are much smaller than those observed for meso-tetraphenylporphyrin, indicating ngetikin that the meso-furyl groups are more inclined towards the porphyrin plane.The decrease in the dihedral angle is due to the presence of intramolecular hydroden bonding between the meso-fury O atom and the β-pyrrole CH group.Intramolecular N—H.

N hydrogen bonds are also present.