A systematic study on the synthesis and properties of aza[5]helicenes bearing one or two nitrogen atoms in selected ring positions is reported for the first time. This photochemical approach can be conveniently applied to the preparation of either mono- or diaza[5]helicenes. The aza[5]helicenes were characterized by NMR spectroscopy, X-ray crystallography, emission spectroscopy, and luminescence lifetime. The extremely long triplet lifetime observed (in the range of seconds) makes these molecules promising candidates for practical applications in photo- and optoelectronics.
Bazzini, C., Brovelli, S., Caronna, T., Gambarotti, C., Giannone, M., Macchi, P., et al. (2005). Synthesis and characterization of some aza[5]helicenes. EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, 2005-03-29(7), 1247-1257 [10.1002/ejoc.200400648].
Synthesis and characterization of some aza[5]helicenes
BROVELLI, SERGIO;MEINARDI, FRANCESCO;TUBINO, RICCARDO
2005
Abstract
A systematic study on the synthesis and properties of aza[5]helicenes bearing one or two nitrogen atoms in selected ring positions is reported for the first time. This photochemical approach can be conveniently applied to the preparation of either mono- or diaza[5]helicenes. The aza[5]helicenes were characterized by NMR spectroscopy, X-ray crystallography, emission spectroscopy, and luminescence lifetime. The extremely long triplet lifetime observed (in the range of seconds) makes these molecules promising candidates for practical applications in photo- and optoelectronics.
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