title: Turning on fluorescent emission from C-alkylation on quinoxaline derivatives.
abstract: Reduction on imine moiety (C=N) of quinoxalines by alkyl-/aryllithiums led to a geometrical change on the quinoxaline ring, thereby perturbing the electronic structure to turn on fluorescence emission. Such a structural change resulted in interrupted cyclic-ring systems with electron-donating amine (sp(3)-type) and electron-accepting imine (sp(2)-type) units bridged by a phenylene unit. Through either alkylation or arylation, a highly polarized electron donor-electron acceptor bipolar system was established in a single molecule with dramatically enhanced PL efficiency (up to 60%).
authors.affiliation: Department of Materials Chemistry, Sejong Campus, Korea University, Chochiwon, Chung-Nam 339-700, South Korea.
authors.forename: Ho-Jin
authors.initials: HJ
authors.lastname: Son
authors.forename: Won-Sik
authors.initials: WS
authors.lastname: Han
authors.forename: Kyung-Ryang
authors.initials: KR
authors.lastname: Wee
authors.forename: Dae-Hwan
authors.initials: DH
authors.lastname: Yoo
authors.forename: Jong-Ho
authors.initials: JH
authors.lastname: Lee
authors.forename: Soon-Nam
authors.initials: SN
authors.lastname: Kwon
authors.forename: Jaejung
authors.initials: J
authors.lastname: Ko
authors.forename: Sang Ook
authors.initials: SO
authors.lastname: Kang