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Sub-picosecond photoinduced electron transfer in water-soluble porphyrin dimers

✍ Scribed by F.J. Vergeldt; R.B.M. Koehorst; T.J. Schaafsma; J.-C. Lambry; J.-L. Martin; D.G. Johnson; M.R. Wasielewski

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
554 KB
Volume
182
Category
Article
ISSN
0009-2614

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✦ Synopsis

Picosecond as well as femtosecond transient absorption measurements have been performed on eight water-soluble heterodimers consisting of combinations of oppositely charged free base and metal porphyrins which have been electrochemically characterized. The ultrafast non-exponential absorption increase, attributed to solvent-controlled, intradimer charge separation, is energy-gap independent. By contrast, the much slower charge recombination is energy-gap dependent.

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## Abstract Two compounds containing a porphyrin dimer and a perylene tetracarboxylic diimide (PDI) linked by phenyl (**1**) or ethylene groups (**2**) are prepared. The photophysical properties of these two compounds are investigated by steady state electronic absorption and fluorescence spectra a