TERMINALLY SUBSTITUTED CONJUGATED POLYENES - SYNTHESIS AND ENERGY-TRANSFER PROPERTIES

The present publication summarizes the results of our investigations on conjugated polyenes with different end groups. The spectroscopic data reveal the possibility of a selective electronic end group excitation in the conjugated systems influenced by steric factors between the end groups and polyene chains. An intramolecular energy transfer from one excited terminal substituent to the other via the polyene chain is likely. The interruption of the conjugation in the polyenes by a bicycloalkane unit results in a separation of the molecules' spectroscopic behavior. Energy transfer is modified, but still present.