The interactions of two metal-free phthalocyanines [(H2Pc) and Solar Pc (with four peripherical groups: SO2N(CH2CH2OH)2)] and of one metal substituted dye (CoPc) with resting and stimulated human peripheral blood mononuclear cells (PBMC) were compared. The absorption, fluorescence, photoacoustic and EPR spectra of both resting cells and cells stimulated by phytohaemagglutinin, incubated in dimethyl sulfoxide (DMSO) with very low or 95% water content and with or without dye addition, were measured. The fate of the light absorbed by the samples was investigated. It is known that singlet oxygen production is crucial for photodynamic action of dyes. Thermal deactivation and luminescence emission compete with this process, so investigation of these alternative paths of sensitizer deactivation provides information about photodynamic action. The incorporation of the investigated dyes into cells and the perturbation of the cell structure caused by the dyes, the incubation solvent and the activator were investigated by comparing the spectral properties of PBMC before and after stimulation and incubation. Incubation of the cells for 1 h in a solution of Solar Pc in 99.5% aqueous DMSO, resulted in an efficient dye incorporation which was highly selective. Solar Pc being introduced much more efficiently into stimulated cells than into resting cells.
Four various phthalocyanines dyes were oriented in uniaxially stretched polymer films. Polarized absorption, fluorescence, and photoacoustic spectra were measured. From a stepwise reduction procedure, the orientation of molecules with respect to the film stretching direction as well as the orientation of absorption transition moments vectors with respect to molecular skeleton of dye were evaluated. The complexation with various metals and the attachment of side groups to the phthalocyanine ring change the orientations and interactions of the dye molecules with polymer chains. Two bands, B1 and B2, with different orientations of their absorption transition moments were found in the short wavelength spectral region. The obtained results were discussed on the ground of literature data and compared with our previously gathered results concerning the possible application of investigated dyes in photodynamic therapy.
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