The absorption and fluorescence spectra of monomeric and aggregated species present in aqueous solutions of porphyrin c have been resolved by steady-state and time-resolved spectroscopy. The dependence of the singlet oxygen formation yield φΔ on excitation wavelength has also been determined. In the Q-band spectral region, the aggregate absorption and emission spectra are shifted to longer wavelengths with respect to the monomer spectrum with φΔ (monomer)= 0.59 and φΔ(aggregate) = 0.33. The relevance of these findings to the optimization of irradiation conditions in tumour phototherapy using porphyrin c are discussed.
|Number of pages||9|
|Journal||Journal of Photochemistry and Photobiology, B: Biology|
|Publication status||Published - 1 Jan 1989|
- Porphyrin c
- singlet oxygen
- time-resolved spectroscopy