New luminescent fluorenyl-armed linear porphyrin trimers with diphenylacetylene bridges

Abstract

Abstract First a series of porphyrins bearing various fluorenyl donor groups is presented; an intermediate porphyrin bearing three fluorenyl arms (zinc complex 12 ) and compound 13 , bearing only two fluorenyl groups. Then starting from these building blocks, synthesis of new porphyrin trimers 7 and 8 , with in totally eight peripheral fluorenyl arms is performed by using a palladium catalyst. Photophysical properties; absorption and luminescence, of new trimers 7 and 8 are presented. We can then compare these properties to those of reference porphyrin monomer TFP ( 2 ), as well as to those of porphyrin dendrimers bearing various numbers of fluorenyl arms ( 3 and 4 ) and finally to those of the corresponding dimers 5 and 6 , which are the precursor models of this work.