title: Strained and unstrained macrocycles composed of carbazole and butadiyne units: electronic state and optical properties.
abstract: Cu(OAc)(2) catalyzes dehydrogenative condensation of 3,6-bis(2-ethynylphenyl)carbazole in the presence of O(2) to afford the cyclization product 1 and cyclodimer 2. Compound 1 contains bent carbazole and butadiyne groups, while 2 has a less strained structure with Z shape around the two parallel butadiyne groups. Optical properties of the compounds are discussed based on the electronic states estimated from electrochemical measurement and density functional theory calculation.
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503 (Mail Box R1-03), Japan.
authors.forename: Tomohito
authors.initials: T
authors.lastname: Ide
authors.forename: Sho
authors.initials: S
authors.lastname: Sakamoto
authors.forename: Daisuke
authors.initials: D
authors.lastname: Takeuchi
authors.forename: Kohtaro
authors.initials: K
authors.lastname: Osakada
authors.forename: Shigeru
authors.initials: S
authors.lastname: Machida