title: Fully pi-conjugated helices from oxidative cleavage of meso-aryl-substituted expanded porphyrins.
abstract: 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.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Saito
authors.forename: Ko
authors.initials: K
authors.lastname: Furukawa
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka