Donor–acceptor substituted tetraethynylethenes (pages 226–231)
Dr. Rik R. Tykivinski, Martin Schreiber, Paul Seiler, Prof. François Diederich and Dr. Volker Gramlich
Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19960080308
A comprehensive series of donor/acceptor substituted tetraethynylethenes has been prepared by palladium-catalyzed acetylenic coupling. The conjugated C-atom scaffolds of these remarkably stable compounds are planar, including the substituted phenyl rings. Trends in electronic, optical, and structural properties as a function of degree and pattern of substitution are reported and the effectiveness of intramolecular donor–acceptor interactions via linear conjugation paths and cross-conjugation paths compared.