title: Control of Conformation and Chirality of Nonplanar π-Conjugated Diporphyrins Using Substituents and Axial Ligands.
abstract: Nonplanar conformations of pyrazine-fused Zn(II) diporphyrins could be controlled by the choice of the meso-aryl substituents and an axial ligand on the central metals. Zn(II) 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 Zn(II) diporphyrins in the twisted conformation was achieved by controlling their handedness of the molecular twist through coordination of optically active 1-phenethylamine.
authors: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan.
authors: Satoru
authors: S
authors: Ito
authors: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan. hiroto@apchem.nagoya-u.ac.jp.
authors: Satoru
authors: S
authors: Hiroto
authors: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan.
authors: Naoki
authors: N
authors: Ousaka
authors: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan.
authors: Eiji
authors: E
authors: Yashima
authors: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan. hshino@apchem.nagoya-u.ac.jp.
authors: Hiroshi
authors: H
authors: Shinokubo
keywords: chirality; circular dichroism; conformation; helicity; porphyrin