PICOSECOND DYNAMICS OF INTRAMOLECULAR CHARGE-TRANSFER PROCESSES OF BETA-SUBSTITUTED PORPHYRINS ADSORBED ON THE POROUS-GLASS

Intramolecular charge separation and charge recombination dynamics of 2,8,12,18-tetrakis(9-anthryl) substituted porphyrin (PA) adsorbed on p orous glass were investigated. It was found that the porphyrin moiety adsorbed on the porous glass was protonated to form a dication which a ccepts an electron from the anthryl moiety. The application of picosec ond transient absorption spectroscopy and time-resolved fluorescence m easurements revealed that the charge transfer in the excited state of PA took place within 7 ps after the excitation even in the adsorbed sy stem, The rapid intramolecular charge separation process in the adsorb ed state without polar solvents was discussed by comparing the present result with those in solutions.