NDLI: Water-Soluble Pyridyl Porphyrins with Amphiphilic N-Substituents: Fluorescent Properties and Photosensitized Formation of Singlet Oxygen

Content Provider	Springer Nature Link
Author	Stasheuski, A. S. Galievsky, V. A. Knyukshto, V. N. Ghazaryan, R. K. Gyulkhandanyan, A. G. Gyulkhandanyan, G. V. Dzhagarov, B. M.
Copyright Year	2014
Abstract	Spectral and photophysical characteristics of a number of free bases and zinc complexes of cationic porphyrins that were synthesized in order to modify their specific interaction with biomolecules were studied. It was shown that the electronic excitation-energy intramolecular relaxation rate constants (fluorescent k $_{f}$ and non-fluorescent knf for the photosensitizer S $_{1}$ → S $_{0}$ transition and also intersystem crossing rate constant kisc for the S $_{1}$ → T $_{1}$ transition) decreased by ~1.5 times for [3-pyridyl]porphyrin free bases as compared with the [4-pyridyl]-isomers. A chargetransfer state for both the free bases and the Zn-porphyrins impacted directly the shape of the fluorescence spectra and contributed equally to relaxation through the S $_{1}$ → S $_{0}$, S $_{1}$ ~ ~ > S $_{0}$, and S $_{1}$ ~ ~ > T $_{1}$ paths. All studied porphyrins exhibited high quantum yields for singlet-oxygen formation (~80 %) with an intrinsic fluorescence level of several percent. Such photophysical parameters indicated that the examined water-soluble porphyrins were promising compounds for both application in targeted photodynamic therapy and fabrication of luminescent sensors.
Starting Page	813
Ending Page	823
Page Count	11
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	80
Issue Number	6
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2014-01-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cationic porphyrins quantum yield kinetic fluorescence spectroscopy triplet state photosensitizer singlet oxygen charge-transfer state (CT-state) Atomic/Molecular Structure and Spectra Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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