title: Directly 2,12- and 2,8-Linked Zn(II) Porphyrin Oligomers: Synthesis, Optical Properties, and Coherence Lengths.
abstract: Directly 2,12- and 2,8-linked Zn(II) porphyrin oligomers were prepared from 2,12- and 2,8-diborylated Zn(II) porphyrin by a cross platinum-induced coupling with a 2-borylated Zn(II) porphyrin end unit followed by a triphenylphosphine (PPh3 )-mediated reductive elimination. Comparative studies on the steady-state absorption and fluorescence spectra and the fluorescence lifetimes led to a conclusion that the exciton in the S1 state is delocalized over approximately four and two Zn(II) porphyrin units for 2,12- and 2,8-linked Zn(II) porphyrin arrays, respectively.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan).
authors.forename: Hua-Wei
authors.initials: HW
authors.lastname: Jiang
authors.affiliation: Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749 (Korea).
authors.forename: Taeyeon
authors.initials: T
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan).
authors.forename: Takayuki
authors.initials: T
authors.lastname: Tanaka
authors.affiliation: Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749 (Korea). dongho@yonsei.ac.kr.
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan). osuka@kuchem.kyoto-u.ac.jp.
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka
keywords: absorption; fluorescence; oligomerization; porphyrinoids; synthetic methods; zinc