Fluorescence and UV/Vis spectroscopic behaviour of novel biindolizines

Indolizines, known as a useful class of fluorophores, were bridged yielding biindolizines. We intended to obtain long wavelength absorbing and emittin g fluorescent systems suitable for fluorescence labeling of biomolecules. T he influence of the different kinds of coupling on the absorption and fluor escence behaviour of the resulting biidolizines was studied. The new fluoro phore systems were characterized spectroscopically by their absorption and emission maxima and their quantum yields. (C) 2000 Elsevier Science Ltd. Al l rights reserved.