Cover Picture: Organic Light-Emitting Diodes from Symmetrical and Unsymmetrical π-Extended Tetraoxa[8]circulenes (Chem. Eur. J. 44/2010)

摘要

π-Extended tetraoxa[8]circulenes are formed in an acid-mediated condensation of 2,3-bisundecyl-1,4-benzoquinone with 1,4-naphthoquinone. The synthesis, characterization and incorporation of this series of alkane-soluble π-extended tetraoxa[8]circulenes in organic light-emitting diodes is described in the Communication by Pittelkow et al. on page 13030 ff. The tetraoxa[8]circulenes, depicted on the cover and overlooked by the Danish children's cartoon celebrity “Cirkeline”, exhibit beautiful green–blue to blue fluorescence depending on the substitution pattern.