Abstract
The cationic meso-aryl-substituted porphyrins and their metal complexes were studied as model compounds for photodynamic therapy by electron spin resonance (ESR) techniques. Symmetrical cationic porphyrins with terminal pyridinium groups on short alkyl spacers and their Zn(II) and Cu(II) complexes were synthesized. Zero-field splitting parameters of the photoexcited triplet states were determined by time-resolved ESR. For Cu(II) complexes, the hyperfine coupling between the paramagnetic ligand and the nitrogen atoms of the porphyrin ring was measured. The effect of pyridinium substituents and the ligand on the magnetic-resonance parameters of porphyrins was analyzed on the basis of the obtained results.
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The study was supported by the Russian Science Foundation (project no. 20-73-10239).
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Translated by Z. Svitanko
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Sannikova, N.E., Zhdanova, K.A., Spitsyna, A.S. et al. Study of Cationic Porphyrins and Their Metal Complexes by ESR Techniques. Russ J Coord Chem 48, 1–8 (2022). https://doi.org/10.1134/S1070328422010031
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DOI: https://doi.org/10.1134/S1070328422010031