Radiative Deactivation of Lowest Singlet and Triplet Excited States of Water-Soluble Porphyrins

Radiative deactivation of lowest excited triplet and singlet states for series of free bases and Zn 2+ -complexes of water-soluble 5,10,15,20-tetrakis-(4-sulfonatophenyl)porphyrin (H 2 T4SPP); 5,10,15,20-tetrakis-(4-N-alkylpyridyl) porphyrin (H 2 T4AlkPyP); and 5,10,15,20-tetrakis-(3-N-alkylpyridyl)...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2018-01, Vol.84 (6), p.960-965
Main Authors: Knyukshto, V. N., Starukhin, A. S., Kruk, M. M., Gorskii, A. V.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Aromatic compounds
ATOMIC AND MOLECULAR PHYSICS
Atomic/Molecular Structure and Spectra
BINDING ENERGY
Deactivation
Energy levels
EXCITED STATES
FLUORESCENCE
PHOSPHORESCENCE
Physics
Physics and Astronomy
PORPHYRINS
SPIN
Spin coupling
TRIPLETS
Water chemistry
Zinc compounds
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Summary:Radiative deactivation of lowest excited triplet and singlet states for series of free bases and Zn 2+ -complexes of water-soluble 5,10,15,20-tetrakis-(4-sulfonatophenyl)porphyrin (H 2 T4SPP); 5,10,15,20-tetrakis-(4-N-alkylpyridyl) porphyrin (H 2 T4AlkPyP); and 5,10,15,20-tetrakis-(3-N-alkylpyridyl)porphyrin (H 2 T3AlkPyP) was studied in solutions at 77 and 293 K. The fluorescence and phosphorescence quantum yields were found to have small but detectable differences for derivatives of the same porphyrin ligand with different counterions for the ionized aryl substituents. It was shown that these differences were due to spin–orbit coupling effects and variation of the electron donor/acceptor properties of the peripheral substituents that changed the electronic energy levels in the porphyrin–counterion system.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-018-0571-2