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

Journal Article · Mon Jan 15 04:00:00 EST 2018 · Journal of Applied Spectroscopy

DOI:https://doi.org/10.1007/S10812-018-0571-2· OSTI ID:22810231

Starukhin, A. S. ^[1]

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1. B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus (Belarus)

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

• OSTI ID: 22810231
• Journal Information: Journal of Applied Spectroscopy, Journal Name: Journal of Applied Spectroscopy Journal Issue: 6 Vol. 84; ISSN 0021-9037
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BINDING ENERGY
EXCITED STATES
FLUORESCENCE
PHOSPHORESCENCE
PORPHYRINS
SPIN
TRIPLETS