Subpyriporphyrin—A [14]Triphyrin(1.1.1) Homologue with an Embedded Pyridine Moiety

Short and to the point: A three-centered hydrogen bond is present in 6,16-dimesityl-11-phenylsubpyriporphyrin, a non-aromatic free-base triphyrin(1.1.1)-related molecule. X-ray crystal structural analysis shows this compound contains the shortest known N⋅⋅⋅N distance (2.370 Å) for two N atoms involved in hydrogen bonding. The molecule also acts as a ligand, as shown by the formation of a boron complex.