| Abstract |
The great importance of the porphyrin compounds lies in their fundamental key role that they play in biological systems, as much as in their ability to mimic natural photosynthesis. In addition, their unique physicochemical and electrochemical properties attracts vast interest in their synthesis and characterization. The extensive π conjugated system of the porphyrins define them as suitable electron donor moieties in photoinduced electron transfer processes. Porphyrins and their derivatives have been extensively used as photosensitizers due to their chemical stability along with their broad absorption in the visible region. Moreover, porphyrins eventually could act as a source of electrons when joined with an electron acceptor.
In this thesis, two suitably modified zinc porphyrin derivatives were synthesized to be used as photosensitizers in photovoltaic systems. Both moieties incorporate long peripheral alkoxy chains, in order to reduce the aggregation propensity of the compounds, with the carboxylic acid acting as a binding group to enable the adsorption of the porphyrins onto the surface of the semiconductor (TiO2). The differentiation of these two chromophores is the distance of the porphyrin ring from the anchoring group, with the introduction of a triazole bridge. The identification and characterization of the final compounds, as well as of the intermediates, was achieved via nuclear magnetic resonance (NMR) 1H and 13C, ultraviolet-visible (UV-Vis), Fluorescence, mass spectrometry (MALDI) and electrochemistry.
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Σύνθεση και χαρακτηρισμός πορφυρινικών παραγώγων για εφαρμογή σε φωτοβολταικές διατάξεις τύπου DSSC
