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General introduction
Meso-tetra(4-sulphonatophenyl)porphine
(TPPS4) is a dye, which optical properties significantly
depends on its local concentration, medium pH and other enviromental
conditions. In acid media TPPS4 tends to form the J-aggregates
possessing characteristic absorption band of excitonic origin at
490 nm.
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TPPS4 was studied and applied as a potential
photosensitizer in the photosensitized tumour therapy trials. Due to distinct
spectroscopic properties J-aggregates could found the practical applications
in photographic industry and for information storage.
The conversion of various species of TPPS4 in different media
and changes in their spectroscopic properties were studied in present
work. The formation conditions for J-aggregates were determined and a
spatial structure of the aggregates was proposed.
Various methods were applied in this study, such as a steady and excited
state absorption, fluorescence spectroscopy, excited state relaxation
kinetics measurements, X ray diffraction, atomic force microscopy.
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