title: Synthesis and luminescence properties of U-shaped polycyclic molecules containing syn-facial functionalized quinoxaline rings.
abstract: [reaction: see text] Rigid U-shaped molecules containing syn-facially situated quinoxaline rings have been synthesized in three steps, by a combination of the Diels-Alder reaction, the ruthenium-catalyzed oxidation, and the Zn(OAc)(2)-catalyzed condensation of the resulting bis-alpha-diketones with benzene-1,2-diamines. The unsymmetric bis-quinoxalines, with electronically different substituents, and the quinoxaline ring-attached alpha-diketones were also prepared. Their luminescence properties were examined and described.
authors.affiliation: Department of Chemistry and Biochemistry, National Chung Cheng University, Minsyong, Chiayi, Taiwan. chetcc@ccu.edu.tw
authors.forename: Teh-Chang
authors.initials: TC
authors.lastname: Chou
authors.forename: Kung-Ching
authors.initials: KC
authors.lastname: Liao
authors.forename: Jin-Ju
authors.initials: JJ
authors.lastname: Lin