Solubilization and Photoreaction of Thiazine Dyes in Reversed Micelles

1980 ◽  
Vol 35 (11) ◽  
pp. 1444-1448 ◽  
Author(s):  
Norio Miyoshi ◽  
Giiti Tomita
Keyword(s):  
Absorption Band ◽  
Singlet Oxygen ◽  
Reversed Micelles ◽  
Quantum Yields ◽  
Micellar Solutions ◽  
Oxygen Production ◽  
Relative Quantum ◽  
Thiazine Dyes ◽  
Monomer Band

AbstractThiazine dyes were solubilized very slowly in dodecylammonium propionate reversed micellar cyclohexanic solutions containing 0.5 M H2O. Light accelerated highly the solubilization of the dyes. The dye monomer band blue-or red-shifted by the solubilization dependent on the dye species. Thiazine dyes solubilized in the reversed micelles containing 0.1 M H2O exhibited a new absorption band at about 500 nm. The photoreduction of thiazine dyes by allylthiourea was enhanced drastically by solubilizing the dyes in the reversed micellar solutions containing 0.5 M H2O, and the singlet oxygen production was also effectively photosensitized by the solubilized thiazine dyes. The relative quantum yields for the photoreduction of the dyes by allylthiourea and the furan oxidation by singlet oxygen produced by the photosensitization of the dyes were obtained in the reversed micellar solutions. Results obtained were discussed in connection with the solubilization.

scholarly journals Singlet Oxygen Production Photosensitized by Fluorescein in Reversed Micellar Solutions

1980 ◽  
Vol 35 (6) ◽  
pp. 731-735 ◽  
Author(s):  
Norio Miyoshi ◽  
Giiti Tomita
Keyword(s):  
Optical Properties ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Water Content ◽  
Reversed Micelles ◽  
Micellar Solutions ◽  
Oxygen Production ◽  
Fluorescence And Phosphorescence

Abstract The quantum yield of singlet oxygen production was investigated in dodecylammonium propionate reversed micellar solutions containing 1,3-diphenylisobenzofuran and fluo-rescein as photosensitizer. The quantum yield was highly enhanced by the binding of fluorescein to reversed micelles, and increased with decreasing the solubilized water content in reversed micelles. Results obtained was discussed with the optical properties of fluorescein (absorption, fluorescence and phosphorescence) in reversed micellar solutions.

scholarly journals New polymeric photosensitizers

2001 ◽  
Vol 73 (3) ◽  
pp. 491-495 ◽  
Author(s):  
Maria Nowakowska ◽  
Mariusz Kepczynski ◽  
Krzysztof Szczubialka
Keyword(s):  
Singlet Oxygen ◽  
Polymer Chain ◽  
Rose Bengal ◽  
Quantum Yields ◽  
Oxygen Production ◽  
Oxygen Formation ◽  
Singlet Oxygen Formation

Novel polymeric photosensitizers for singlet oxygen production in water are described. The polymers contain rose bengal (4,5,6,7-tetrachloro-2',4',5',7'­tetraiodo-fluorescein) chromophores covalently attached to the polymer chain. The quantum yields of singlet oxygen formation and photooxidation of phenol in water have been determined. The methods of separation of photosensitizer from the reactants after completion of reaction have been established.

A quantitative structure–property relationship (QSPR) study of singlet oxygen generation by pteridines

2016 ◽  
Vol 15 (6) ◽  
pp. 801-811 ◽  
Author(s):  
Andrey A. Buglak ◽  
Taisiya A. Telegina ◽  
Mikhail S. Kritsky
Keyword(s):  
Dipole Moment ◽  
Singlet Oxygen ◽  
Quantum Yields ◽  
Quantitative Structure ◽  
Oxygen Production ◽  
Structure Property ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Structure Property Relationship ◽  
Qspr Study

Singlet oxygen production quantum yields of pteridine photosensitizers were analyzed with the QSPR method. The ability of pterins and flavins to generate1O2in D2O correlated withEHOMOand electronegativity, as well as with the dipole moment and some other parameters.

Quantum Yields of Singlet-Oxygen Production by Some Natural Quinoid Fungal Metabolites and Derivatives

1992 ◽  
Vol 75 (2) ◽  
pp. 531-538 ◽  
Author(s):  
Taraneh Aminian-Saghafi ◽  
Gianluca Nasini ◽  
Tullio Caronna ◽  
Andr� M. Braun ◽  
Esther Oliveros
Keyword(s):  
Singlet Oxygen ◽  
Quantum Yields ◽  
Fungal Metabolites ◽  
Oxygen Production

Adapting BODIPYs to singlet oxygen production on silica nanoparticles

2017 ◽  
Vol 19 (21) ◽  
pp. 13746-13755 ◽  
Author(s):  
Nerea Epelde-Elezcano ◽  
Ruth Prieto-Montero ◽  
Virginia Martínez-Martínez ◽  
María J. Ortiz ◽  
Alejandro Prieto-Castañeda ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Silica Nanoparticles ◽  
Fluorescent Dyes ◽  
External Surface ◽  
Quantum Yields ◽  
Core Shell ◽  
Oxygen Production ◽  
The Core ◽  
Spherical Core

Spherical core–shell silica NPs with fluorescent dyes embedded in the core and Iodo-BODIPYs as new photosensitizers grafted at the external surface were prepared. Their fluorescence and singlet oxygen quantum yields were determined and possible FRET was evaluated.

scholarly journals Production and Reaction of Singlet Oxygen in Aqueous Micellar Solutions Using Pyrene as Photosensitizer

1978 ◽  
Vol 33 (6) ◽  
pp. 622-627 ◽  
Author(s):  
Norio Miyoshi ◽  
Giiti Tomita
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Rate Constant ◽  
Oxidation Reaction ◽  
Sodium Dodecyl ◽  
Trimethylammonium Chloride ◽  
Micellar Solutions ◽  
Oxygen Production ◽  
Aqueous Micellar Solutions ◽  
Penetration Probability

Abstract The reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in aqueous micellar solutions of sodium dodecyl sulfate and dodecyl trimethylammonium chloride using pyrene as photosensitizer. Singlet oxygen, produced by the photosensitization of pyrene bound to micelles, oxidized efficiently 1,3-diphenylisobenzofuran bound to micelles. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were determined by the kinetic analysis for the oxidation reaction of furan. Quenching of singlet oxygen by sodium azide competed with the furan oxidation, and its rate constant was also determined. Results obtained were compared with those in methanolic solutions. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were much higher in micellar solutions than those in methanolic solutions. Empty micelles wxas found to act as a considerably strong scavenger for singlet oxygen. The penetration probability of singlet oxygen from aqueous phase into the interior of micelles which bound furan was also estimated

Quenching of Singlet Oxygen by Sodium Azide in Reversed Micellar Systems

1979 ◽  
Vol 34 (2) ◽  
pp. 339-343 ◽  
Author(s):  
Norio Miyoshi ◽  
Giiti Tomita
Keyword(s):  
Singlet Oxygen ◽  
Heavy Atom ◽  
Reversed Micelles ◽  
Micellar Solutions ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching ◽  
Micellar Systems ◽  
Azide Ion ◽  
State Of Water ◽  
Atom Effect

Abstract The oxidation reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in cyclohexanic reversed micellar solutions of dodecylammonium propionate, using pyrene as photosensitizer. The furan oxidation was effectively inhibited by azide ion-bound reversed micelles. Empty reversed micelles also inhibited the furan oxidation to some extent. The inhibition of the furan oxidation was due to the quenching of singlet oxygen by azide ion-bound and empty reversed micelles. Such singlet oxygen quenching was dependent on the concentration of water added.Results obtained were discussed in connection with the polarity in the interior of reversed micelles, micellar size, the state of water solubilized in reversed micelles and the lifetime of singlet oxygen. The heavy atom effect on the quenching of singlet oxygen was also studied using heavy water.

Synthesis of a Negative Photochrome with High Switching Quantum Yields and Capable of Singlet Oxygen Production and Storage

2021 ◽  
Author(s):  
Guy Royal ◽  
Zakaria ZIANI ◽  
Frédérique LOISEAU ◽  
Christian PHILOUZE ◽  
Saioa Cobo ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Quantum Yields ◽  
Oxygen Production ◽  
And Storage

scholarly journals Synthesis of a Negative Photochrome with High Switching Quantum Yields and Capable of Singlet‐Oxygen Production and Storage

2021 ◽  
Author(s):  
Zakaria Ziani ◽  
Frédérique Loiseau ◽  
Elise Lognon ◽  
Martial Boggio‐Pasqua ◽  
Christian Philouze ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Quantum Yields ◽  
Oxygen Production ◽  
And Storage
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