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Solvent effects on the relaxation mechanism of Cu(II) protoporphyrin

โœ Scribed by E.F. Hilinski; K.D. Straub; P.M. Rentzepis

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
532 KB
Volume
111
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

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, gla5al 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 hkj-tly polar solvents (water. 15 ps). The data suggest that the solvent polarity and/or Ehe number of asiaI ligands are dominant factors in determining the electronic relaxation rate of the porphyrins studied.

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