Colorful Azulene and Its Equally Colorful Derivatives

• Robert S. H. Liu ^[1]
  1. [1] University of Hawaii at Manoa

     University of Hawaii at Manoa

     Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 79, Nº 2, 2002, pág. 183
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • A simple pictorial method using HOMO, LUMO, and LUMO+1 of azulene coupled with interaction between the electrons in the singly occupied orbitals is introduced to show how the S2-S0 energy gap relative to the S1-S0 gap can be changed by a choice of substituents. The result is changing the characteristic blue color of azulene to an array of other colors: emerald green for 1,3-difluoroazulene, magenta for azulene-1-carboxaldehyde, and red for azulene-1,3-dicarboxaldehyde.