Chapter 25. Steady-State and Time-Resolved Singlet Oxygen Phosphorescence Detection in the Near-IR

2016 ◽  
pp. 7-26 ◽  
Author(s):  
Santi Nonell ◽  
Cristina Flors
Keyword(s):  
Steady State ◽  
Singlet Oxygen ◽  
Time Resolved ◽  
Near Ir

scholarly journals Photophysical properties of two novel tetraphenylporphyrins substituted by guanidiniocarbonyl and monocyclic guanidine groups

2001 ◽  
Vol 3 (3) ◽  
pp. 147-151 ◽  
Author(s):  
Pavel Kubát ◽  
Kamil Lang ◽  
Vladimír Král ◽  
Franz P. Schmidtchen
Keyword(s):  
Steady State ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Electronic Absorption Spectra ◽  
Photophysical Properties ◽  
Soret Band ◽  
Monomeric Form ◽  
High Quantum Yield ◽  
Time Resolved ◽  
J Aggregates

Photophysical properties of two novel guanidiniocarbonyl (I) and monocyclic guanidine (II) tetraphenylporphyrins and their interaction with DNA were investigated by steady-state and time-resolved absorption and emission spectroscopies.Istays predominantly monomeric in aqueous solutions. It produces singlet oxygen with high quantum yield(ΦΔ=0.67)that is typical for monomeric porphyrins. The electronic absorption spectra ofIare not influenced by interaction with DNA. This is in contrast with monomeric tetratolylporphyrins bearing phosphonium,ammonium and pyridinium groups where the formation of stable complexes with DNA is accompanied by a characteristic red shift of the Soret band.IIextensively forms Hand J-aggregates,which do not produce singlet oxygen(ΦΔ<0.01). In the presence of DNA only a small fraction ofIIremains in monomeric form that is bound to DNA exterior.

scholarly journals The phthalocyanines applications in photodynamic therapy investigated by time-resolved and steady-state photothermal methods

2002 ◽  
Vol 4 (2) ◽  
pp. 51-56 ◽  
Author(s):  
Danuta Frackowiak ◽  
Krzysztof Wiktorowicz ◽  
Alfons Planner ◽  
Aneta Waszkowiak ◽  
Rodica-Mariana Ion
Keyword(s):  
Photodynamic Therapy ◽  
Steady State ◽  
Triplet State ◽  
Singlet Oxygen ◽  
Direct Interaction ◽  
Time Resolved ◽  
Oxygen Generation ◽  
Photoacoustic Spectra ◽  
Singlet Oxygen Generation ◽  
Photothermal Methods

The time-resolved photothermal methods are used in order to establish the yield of intersystem (singlet-triplet) crossing of dyes that are candidates for the application in photodynamic therapy. It is known that molecules with long living triplet state cause efficient photosensitization by direct interaction with the cells or by singlet oxygen generation.The steady state photoacoustic spectra enables one to establish the dye incorporation into cells.Both methods were applied to several phthalocyanines and the results gathered by photothermal measurements were compared with the results obtained by means of other methods.The six investigated dyes were compared.

C60 Fullerene-based materials as singlet oxygen O2(1Δg) photosensitizers: a time-resolved near-IR luminescence and optoacoustic study

2001 ◽  
Vol 3 (9) ◽  
pp. 1638-1643 ◽  
Author(s):  
Ferran Prat ◽  
Cristina Martí ◽  
Santi Nonell ◽  
Xiaojun Zhang ◽  
Christopher S. Foote ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
C60 Fullerene ◽  
Time Resolved ◽  
Near Ir

A Broadband Near-IR Detector Based on a Large-Area InGaAs Photodiode for Time-Resolved Detection of Singlet Oxygen

2019 ◽  
Vol 62 (2) ◽  
pp. 252-255 ◽  
Author(s):  
V. G. Goldort ◽  
A. V. Demyanenko ◽  
A. S. Bogomolov ◽  
S. A. Kochubei ◽  
A. P. Pyryaeva ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Large Area ◽  
Ir Detector ◽  
Time Resolved ◽  
Near Ir

scholarly journals Aqueous singlet oxygen reaction kinetics of furfuryl alcohol: effect of temperature, pH, and salt content

2017 ◽  
Vol 19 (4) ◽  
pp. 507-516 ◽  
Author(s):  
Elena Appiani ◽  
Rachele Ossola ◽  
Douglas E. Latch ◽  
Paul R. Erickson ◽  
Kristopher McNeill
Keyword(s):  
Aqueous Solution ◽  
Steady State ◽  
Singlet Oxygen ◽  
Furfuryl Alcohol ◽  
Salt Content ◽  
Effect Of Temperature ◽  
Time Resolved ◽  
Value Determination ◽  
Singlet Oxygen Reaction ◽  
Kinetics Of

The rate constant for the reaction between furfuryl alcohol (FFA) and singlet oxygen (1O2) in aqueous solution was measured as a function of temperature, pH and salt content employing both steady-state photolysis (β value determination) and time-resolved singlet oxygen phosphorescence methods.

scholarly journals Photophysical Properties of Protoporphyrin IX, Pyropheophorbide-a, and Photofrin® in Different Conditions

2021 ◽  
Vol 14 (2) ◽  
pp. 138
Author(s):  
Bauyrzhan Myrzakhmetov ◽  
Philippe Arnoux ◽  
Serge Mordon ◽  
Samir Acherar ◽  
Irina Tsoy ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Photophysical Properties ◽  
Protoporphyrin Ix ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Visible Absorption ◽  
Light Dosimetry ◽  
Time Resolved ◽  
Pyropheophorbide A ◽  
Influence Of Solvent

Photodynamic therapy (PDT) is an innovative treatment of malignant or diseased tissues. The effectiveness of PDT depends on light dosimetry, oxygen availability, and properties of the photosensitizer (PS). Depending on the medium, photophysical properties of the PS can change leading to increase or decrease in fluorescence emission and formation of reactive oxygen species (ROS) especially singlet oxygen (1O2). In this study, the influence of solvent polarity, viscosity, concentration, temperature, and pH medium on the photophysical properties of protoporphyrin IX, pyropheophorbide-a, and Photofrin® were investigated by UV-visible absorption, fluorescence emission, singlet oxygen emission, and time-resolved fluorescence spectroscopies.

scholarly journals Ground- and excited-state characteristics in photovoltaic polymer N2200

RSC Advances ◽  
2021 ◽  
Author(s):  
Guanzhao Wen ◽  
Xianshao Zou ◽  
Rong Hu ◽  
Jun Peng ◽  
Zhifeng Chen ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Excited State ◽  
Steady State ◽  
Excited States ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Time Dependent ◽  
Functional Theory ◽  
Time Resolved ◽  
Dependent Density

Ground- and excited-states properties of N2200 have been studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory calculations.

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