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. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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Bazzini et al. (2005) studied this question.
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