Dendritic poly(l-lysine) combining sixteen free-base porphyrins and sixteen zinc porphyrins hemispherically at the fifth generation was successfully synthesised and showed intramolecular fluorescence energy transfer in DMF.

Since the dendritic poly(l-lysine)s combining eight to thirty-two free base-porphyrins showed split circular dichroism at the Soret band in toluene/N,N-dimethylformamide (9/1, v/v), the immobility of porphyrin rings was evaluated by 1H NMR measurements in terms of the peak width at half-height and spin-lattice relaxation time.

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Dendritic poly(l-lysine)s combining thirty-two free base- and Zn(II)-porphyrins in scramble fashion were successfully synthesized and exhibited highly efficient (85%) fluorescence energy transfer from Zn(II)-porphyrins to free base-porphyrins.