Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2005, Issue 7, Pages 1247-1257Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200400648
Keywords
helical structures; fluorescence spectroscopy; photochemistry
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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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