The main photophysical properties, useful for establishing whether hypericin in anionic form and some of its derivatives containing heavy atoms such as iodine, can be proposed for their use in photodynamic therapy, were determined using density functional based computations. The results showed that in the anionic form and in the iodinated derivatives, the absorption wavelength undergoes a bathochromic shift, the singlet-triplet energy gap assumes values ​that allow to excite the oxygen molecule from its ground to the excited singlet state, and that the spin–orbit couplings between singlet and triplet states significantly increase.

On the origin of photodynamic activity of hypericin and its iodine-containing derivatives

De Simone B. C.;Mazzone G.;Toscano M.;Russo N.
2022

Abstract

The main photophysical properties, useful for establishing whether hypericin in anionic form and some of its derivatives containing heavy atoms such as iodine, can be proposed for their use in photodynamic therapy, were determined using density functional based computations. The results showed that in the anionic form and in the iodinated derivatives, the absorption wavelength undergoes a bathochromic shift, the singlet-triplet energy gap assumes values ​that allow to excite the oxygen molecule from its ground to the excited singlet state, and that the spin–orbit couplings between singlet and triplet states significantly increase.
DFT
hypericin
PDT
photophysical properties
spin–orbit coupling constants
Anthracenes
Iodides
Oxygen
Quantum Theory
Iodine
Perylene
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/338329
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