Fully pi-conjugated helices from oxidative cleavage of meso-aryl-substituted expanded porphyrins.
Fully pi-conjugated oligopyrromethene helices coiling two Cu(II) ions were obtained from oxidative cleavage of expanded porphyrins. The smoothly conjugated backbone structures, distinct near-IR absorption bands, and extended spin-density distributions demonstrated the effective pi-electron delocalization over the whole helices. Magnetic susceptibility and electron spin resonance measurements revealed the antiferromagnetic interaction between the internal Cu(II) ions.
Saito
Shohei
S
Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
Furukawa
Ko
K
Osuka
Atsuhiro
A