Beitraege zur Chemie der Pyrrolpigmente, 86. Mitt.: Darstellung, Struktur und Eigenschaften bichromophorer 10-Arylbilin-1,19-dione

Article abstract of DOI:10.1007/BF00808934

Bichromophoric systems with bilindione residues attached to various positions of benzene, naphthaline, biphenylene, and anthracene moieties were prepared.Their conformational analysis using NMR and UV-VIS techniques reveal arrangements in which the two bilindione chromophores are fixed in defined arrangements with respect to each other.Calculations and absorption spectra at room temperature and 77 K point to a strong dipolar coupling which leads to a recognizeable splitting of the long wavelength bands.Moreover, bilindione chromophores attached in positions α and β of a naphthalene ring behave distinctly different thus providing a means to construct chromophore systems which, although virtually identical, are different with respect to their local conformations, and accordingly to their absorption spectra.