title: Synthesis and properties of triply-bridged syn-carbazolophanes.
abstract: The intramolecular [2 + 2] photocycloaddition of alpha,omega-bis(3,6-divinyl-N-carbazolyl)alkanes 3 afforded triply bridged syn-[2.2.n](3,6,9)carbazolophanes 4a-6a (n = 4) and 4b,5b (n = 5) composed of isomers derived from the difference in the direction of cyclobutane rings. In major isomers 4a and 4b, excimer fluorescence was observed, the maximum position remarkably depending on the tether length.
authors.affiliation: Department of Chemistry, Gunma University, Tenjin-cho, Kiryu, Gunma 376-8515, Japan. nisimura@chem.gunma-u.ac.jp
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Kaneko
authors.forename: Keita
authors.initials: K
authors.lastname: Tani
authors.forename: Teruo
authors.initials: T
authors.lastname: Shinmyozu
authors.forename: Jun
authors.initials: J
authors.lastname: Nishimura