Control of Conformation and Chirality of Nonplanar π-Conjugated Diporphyrins Using Substituents and Axial Ligands
Satoru Ito, Satoru Hiroto, Naoki Ousaka, Eiji Yashima, Hiroshi Shinokubo
Chemistry An Asian Journal
Nonplanar conformations of pyrazine-fused ZnII diporphyrins could be controlled by the choice of themeso-aryl substituents and an axial ligand on the central metals. ZnII diporphyrins bearing sterically demanding meso-aryl groups with ortho-substituents led to a twisted chiral D2 conformation, while an achiral C2h form was preferred in the case of aryl groups without ortho-substituents. Helical chirality induction on ZnII diporphyrins in the twisted conformation was achieved by controlling their handedness of the molecular twist through coordination of optically active 1-phenethylamine.
Circular dichroism, Ligand binding, Inorganic chemistry