Photophysical properties of two novel tetraphenylporphyrins substituted by guanidiniocarbonyl and monocyclic guanidine groups
Photophysical properties of two novel guanidiniocarbonyl (I) and monocyclic guanidine (II) tetraphenylporphyrins and their interaction with DNA were investigated by steady-state and time-resolved absorption and emission spectroscopies. I stays predominantly monomeric in aqueous solutions. It produce...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2001-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X01000186 |
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| Summary: | Photophysical properties of two novel guanidiniocarbonyl (I) and monocyclic guanidine (II)
tetraphenylporphyrins and their interaction with DNA were investigated by steady-state and time-resolved
absorption and emission spectroscopies. I stays predominantly monomeric in aqueous solutions. It produces
singlet oxygen with high quantum yield (ΦΔ=0.67) that is typical for monomeric porphyrins. The electronic
absorption spectra of I are not influenced by interaction with DNA. This is in contrast with monomeric tetratolylporphyrins
bearing phosphonium,ammonium and pyridinium groups where the formation of stable
complexes with DNA is accompanied by a characteristic red shift of the Soret band. II extensively forms Hand
J-aggregates,which do not produce singlet oxygen (ΦΔ<0.01). In the presence of DNA only a small
fraction of II remains in monomeric form that is bound to DNA exterior. |
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| ISSN: | 1110-662X |