Beiträge zur Chemie der Pyrrolpigmente, 84. Mitt.: Darstellung und Lumineszenz bichromophorer 5-Aryl-dipyrrinderivate

Summary 1,3- and 1,4-Bis-dipyrrin-benzenes and their various zinc and difluoroboryl chelates are prepared. Their absorption and fluorescence spectra are compared with those of the corresponding mono-dipyrrin derivatives. The conformations of these compounds are analyzed using the ring current model and absorption spectra. Dipole-dipole type transfer of excitation energy is discussed to represent a main photophysical channel in these compounds.