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.
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