Abstract: We designed and synthesized a novel carbazolesubstituted symmetrical porphyrin derivatives, 5,10,15,20tetracarbazole porphyrins and their lanthanide acetylacetonate (Ln=Gd,Tb,Dy) complexes. We characterized the complexes by means of UVVis spectra, IR spectra, 1H NMR spectra, MS and molar conductances, and studied their fluorescence properties. Experimental results show that quantum yields of Q band fluorescence of rare earth metal porphyrin complexes are 0.007 79—0.158 at room temperature. This is due to the different property of the rare earth metal ions and difference in the intensity of the radiationless transition.

Key words: porphyrin, lanthanide acetylacetone complex, synthesis, characterization