Solvent effects on the relaxation mechanism of Cu(II) protoporphyrin
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The effect of solvent(s) on the energy dissipation mechanism and rate of a Cu(II) porphyrin has been studied by means of picosecond absorption spectroscopy. The relaxation rates of Cu(II) protoporphyrin and Cu(II) protoporphyrin IX dimethyl ester were measured in various solvents, including pyridine, glacial acetic acid and benzene. The time constant for repopulation of the ground state varies by over an order of magnitude from non-polar solvents (benzene, 400 ps) to highly polar solvents (water, 15 ps). The data suggest that the solvent polarity and/or the number of axial ligands are dominant factors in determining the electronic relaxation rate of the porphyrins studied. 1984.
author list (cited authors)
Hilinski, E. F., Straub, K. D., & Rentzepis, P. M.
complete list of authors
Hilinski, EF||Straub, KD||Rentzepis, PM