The conjugated bridge and the attached meso-carbons in the title dimer are almost coplanar; the porphyrin rings are ruffled and distorted in this vicinity, indicating strong interporphyrin interaction via the π-orbitals of the diethynylthiophene unit.
D. P. Arnold, D. A. James, C. H. L. Kennard and G. Smith, J. Chem. Soc., Chem. Commun., 1994, 2131 DOI: 10.1039/C39940002131
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