title: Electron- or hole-transporting nature selected by side-chain-directed π-stacking geometry: liquid crystalline fused metalloporphyrin dimers.
abstract: Novel liquid crystalline (LC) semiconductors were prepared from the copper complex of a fused porphyrin dimer as the electroactive core by attaching to its periphery dodecyl and semifluoroalkyl side chains site-specifically (P≡P(hetero)) and semifluoroalkyl side chains alone (P≡P(homo)). The former and latter formed rectangular columnar and orthorhombic LC mesophases, respectively, where the stacking geometries of the π-conjugated core are quite different from one another. Although the π-electronic properties of the core units in P≡P(hetero) and P≡P(homo) in solution are substantially identical to one another, transient photocurrent profiles of their LC states under time-of-flight conditions clearly showed that P≡P(hetero) behaves as an n-type semiconductor, whereas P≡P(homo), in contrast, behaves as a p-type semiconductor.
authors.affiliation: School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan.
authors.forename: Tsuneaki
authors.initials: T
authors.lastname: Sakurai
authors.forename: Kentaro
authors.initials: K
authors.lastname: Tashiro
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Honsho
authors.forename: Akinori
authors.initials: A
authors.lastname: Saeki
authors.forename: Shu
authors.initials: S
authors.lastname: Seki
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka
authors.forename: Atsuya
authors.initials: A
authors.lastname: Muranaka
authors.forename: Masanobu
authors.initials: M
authors.lastname: Uchiyama
authors.forename: Jungeun
authors.initials: J
authors.lastname: Kim
authors.forename: Sunyeo
authors.initials: S
authors.lastname: Ha
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kato
authors.forename: Masaki
authors.initials: M
authors.lastname: Takata
authors.forename: Takuzo
authors.initials: T
authors.lastname: Aida
mesh_terms: D003300:Copper / Q000737:chemistry*; D019281:Dimerization; D004583:Electrons; D050866:Liquid Crystals / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D012666:Semiconductors
chemical_list: D008665:Metalloporphyrins; D003300:Copper