The synthesis and spectroscopic characterization of some diazahelicenes is presented. The synthetic approach varies according to the location of the N-atoms; thus, three different synthetic pathways are used (Schemes 1–3). A description of UV/VIS and of fluorescence and phosphorescence emission is also reported. NMR Spectra show the importance of the distorted backbone of these molecules.
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Caronna et al. (2002) studied this question.