Affiliation:
1. Belarusian State Technological University
2. Ivanovo State University of Chemistry and Technology
3. Ivanovo State University of Chemistry and Technology, G. A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences
Abstract
The comparative study of the spectral-luminescent properties of hydrophilic 21-thia-5,10,15,20-tetra-(4-sulfonatophenyl)-porphyrin and 5,10,15,20-tetra-(4-sulfonatophenyl)-porphyrin is carried out in solutions at 293 K. The peculiarities of the halochromic effects have been revealed for the first time, which were due to the replacement of the pyrrole ring by thiophene in the macrocycle. It is found that multicenter interactions
on the periphery and in the core of the macrocycle led to the modulation of the spin-orbit interactions which became apparent in changes of the fluorescence quenching efficiency. It is shown that the fluorescence of the doubly protonated form of heteroporphyrin deceases compared to the free base whereas the
double protonated form of porphyrin reveals the fluorescence enhancement.
Publisher
National Academy of Sciences of Belarus
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