Singlet oxygen-triplet organic molecule annihilation fluorescence in polymer matrices

Kenner, Rex D.; Khan, Ahsan U.

doi:10.1016/0009-2614(75)85357-7

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…] pairs, which, decaying with the formation of S1 states of the PS, additionally generate its DF [57][58][59].…”

Section: Resultsmentioning

confidence: 99%

Plasmon-enhanced sensitization of singlet oxygen on silver island films

Menshova,

Ibrayev,

Strekal

2024

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The influence of the plasmonic effect of silver island films on the absorption, fluorescence and long-term luminescence of rose bengal in polyvinyl butyral films has been studied. Under the plasmon effect, the optical density of the dye increased by 3.3 times, the fluorescence intensity by 8.5 times, and the long-lived fluorescence and phosphorescence by 7.08 times and 10.21, respectively. It is shown that in the plasmon field of metal nanoparticles, both an increase in the excitation rate and an increase in the rates of radiative decay of excited singlet and triplet states occur. Phosphorescence of singlet oxygen with a lifetime of 86.46 μs was observed when excited in the absorption band of rose bengal. Based on the calculation of the quenching constants of rose bengal phosphorescence by molecular oxygen molecules, it is shown that the plasmonic effect enhances the energy transfer from dye triplets to oxygen molecules in collision complexes [ТPS…3  g –] as a result of heteroannihilation. Subsequently, the triplet pair decomposes to form a singlet oxygen molecule and a photosensitizer molecule in the ground state. The plasmonic effect of silver nanoparticles leads to an increase in the generation of singlet oxygen by 4.8 times.

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“…] pairs, which, decaying with the formation of S1 states of the PS, additionally generate its DF [57][58][59].…”

Section: Resultsmentioning

confidence: 99%

Plasmon-enhanced sensitization of singlet oxygen on silver island films

Menshova,

Ibrayev,

Strekal

2024

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“…Measuring the lifetime of thermally-activated DF of PpIX has been proposed as a method for determination of mitochondrial oxygen tension with potential application in perioperative medicine, intensive care medicine, and real-time PDT monitoring. [67][68][69][70][71][72] Given that SOSDF is manifested in a wide range of PSs, 26,27,29,30,32,73 our future plans are aimed to investigate whether PpIX exhibits also SOSDF to some extent besides the thermally-activated DF.…”

Section: Discussionmentioning

confidence: 99%

“…20,21 Singlet oxygen-sensitized delayed fluorescence (SOSDF) is a delayed emission from the S 1 state of the PS populated by reversed energy transfer from 1 O 2 . A singlet oxygen feedback mechanism [24][25][26][27][28][29]…”

Section: Introductionmentioning

confidence: 99%

The singlet-oxygen-sensitized delayed fluorescence in mammalian cells: a time-resolved microscopy approach

Scholz

Biehl

Dědic

et al. 2015

Photochem Photobiol Sci

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The present work provides a proof-of-concept that the singlet oxygen-sensitized delayed fluorescence (SOSDF) can be detected from individual living mammalian cells in a time-resolved microscopy experiment. To this end, 3T3 mouse fibroblasts incubated with 100 μM TPPS4 or TMPyP were used and the microsecond kinetics of the delayed fluorescence (DF) were recorded. The analysis revealed that SOSDF is the major component of the overall DF signal. The microscopy approach enables precise control of experimental conditions - the DF kinetics are clearly influenced by the presence of the (1)O2 quencher (sodium azide), H2O/D2O exchange, and the oxygen concentration. Analysis of SOSDF kinetics, which was reconstructed as a difference DF kinetics between the unquenched and the NaN3-quenched samples, provides a cellular (1)O2 lifetime of τΔ = 1-2 μs and a TPPS4 triplet lifetime of τT = 22 ± 5 μs in agreement with previously published values. The short SOSDF acquisition times, typically in the range of tens of seconds, enable us to study the dynamic cellular processes. It is shown that SOSDF lifetimes increase during PDT-like treatment, which may provide valuable information about changes of the intracellular microenvironment. SOSDF is proposed and evaluated as an alternative tool for (1)O2 detection in biological systems.

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“…High quenching efficiency is also exhibited by tetramethylammonium superoxide [30] and iodide salts 1621 in aprotic solvents. The physical interaction between '02 and organic molecules in excited triplet state in polymeric matrices 64 1 results in annihilation fluorescence and explains the molecular oxygen induced fluorescence of aromatic hydrocarbons [41].…”

Section: On Generation Of ' 0 mentioning

confidence: 99%

Recent Developments in Singlet Molecular Oxygen Chemistry

Rosenthal

1976

Photochem & Photobiology

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This review is an attempt to summarize the literature pertinent to singlet molecular oxygen over the period June 1975-June 1976. Reports on this topic span a wide range of interests: from theoretical attempts to understand, and consequently predict, the interaction between '02 and organic materials, to applications of these reactions to complex biological systems. Although such a survey is necessarily heterogeneous and can hardly be exhaustive, it emphasizes the interdisciplinary aspects of this subject.

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Singlet oxygen-triplet organic molecule annihilation fluorescence in polymer matrices

Cited by 17 publications

References 18 publications

Plasmon-enhanced sensitization of singlet oxygen on silver island films

Plasmon-enhanced sensitization of singlet oxygen on silver island films

The singlet-oxygen-sensitized delayed fluorescence in mammalian cells: a time-resolved microscopy approach

Recent Developments in Singlet Molecular Oxygen Chemistry

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