Advanced Materials, Vol.8, No.3, 226-231, 1996
Donor-acceptor substituted tetraethynylethenes
Communication: 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.