1. Cover Picture: Synthesis and Characterization of Some Aza[5]helicenes (Eur. J. Org. Chem. 7/2005)
- Author
-
Walter Panzeri, Cristina Bazzini, Francesco Recupero, Sergio Brovelli, Matteo Giannone, Tullio Caronna, Riccardo Tubino, Piero Macchi, Francesco Meinardi, Cristian Gambarotti, Angelo Sironi, and Andrea Mele
- Subjects
Stereochemistry ,Metal ions in aqueous solution ,Organic Chemistry ,Ring (chemistry) ,Characterization (materials science) ,Crystal ,chemistry.chemical_compound ,Crystallography ,Helicene ,chemistry ,Molecule ,Cover (algebra) ,Physical and Theoretical Chemistry ,Enantiomer - Abstract
The cover picture shows the structure of 5-aza[5]helicene (top) and the crystal packing (single enatiomers, bottom). This is one of the aza[5]helicenes reported in the paper that were synthesized by photochemical ring closure of suitable ethenyl derivatives. The photophysical properties (very long triplet-state lifetime) and crystal packing (columnar arrangement) were studied and shown to be dependent on the nitrogen position. These molecules may be suitable for studies on π−π interactions and complexation with metal ions. The extremely long triplet lifetime that was observed (in the range of seconds) makes these molecules promising candidates for practical applications in photo- and optoelectronics. Details are discussed in the article by T. Caronna et al. on p. 1247 ff.
- Published
- 2005
- Full Text
- View/download PDF