A dithiaporphyrin building block with an N2S2 core is synthesized and coupl
ed with porphyrin building blocks with N-4 cores to obtain an unsymmetrical
pentamer. Steady-state fluorescence spectra indicated that there is an eff
icient energy transfer from an excited N-4 porphyrin unit to an N2S2 porphy
rin unit. (C) 2000 Elsevier Science Ltd. All rights reserved.