Photosensitized Reduction of Methyl Viologen Using Eosin-Y in Presence of a Sacrificial Electron Donor in Water–Alcohol Mixture

Islam, Shafiqul D.-M.; Konishi, Toshifumi; Fujitsuka, Mamoru; Ito, Osamu; Nakamura, Yuko; Usui, Yoshiharu

doi:10.1562/0031-8655(2000)071<0675:promvu>2.0.co;2

Cited by 51 publications

(43 citation statements)

References 27 publications

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“…The results showed that the transient absorption spectra of the dyes in the matrix correspond to those reported in literature for the dyes in the solution [31,32]. As an example, in Figure 6, the transient absorption spectra of EoY in THF and in the SSO film and Eo2 in SSO are displayed.…”

Section: Resultssupporting

confidence: 80%

Photophysical Behavior of Modified Xanthenic Dyes Embedded into Silsesquioxane Hybrid Films: Application in Photooxidation of Organic Molecules

Waiman

Palacios

Montejano

et al. 2017

International Journal of Photoenergy

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Polymeric materials based on a bridged silsesquioxane with pendant dodecyl chains were synthesized and modified with different xanthenic dyes with the aim of developing a material with potential application in photooxidation of organic compounds. The employed dyes constitute a family of novel xanthenic chromophores with outstanding properties as singlet oxygen photosensitizers. The hybrid matrix was chosen for its enhanced properties such as flexibility and chemical resistance. The employed dyes were easily incorporated into the hybrid polymer obtaining homogeneous, transparent, and low-refractive-index materials. The polymeric films were characterized using UV-Vis absorption, fluorescence, and laser flash photolysis techniques. The ability of these materials to produce singlet oxygen was tested following the photooxidation of 9,10-dimethylanthracene which is a well-known chemical trap for singlet oxygen. High photooxidation efficiencies were observed for these materials, which present the advantage of being easily removed/collected from the solution where photooxidation takes place. While photobleaching of the incorporated dyes is commonly observed in the solution, it takes place very slowly when dyes are embedded in the hybrid matrix. These properties bode well for the potential use of these materials in novel wastewater purification strategies.

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Section: Resultssupporting

confidence: 80%

Photophysical Behavior of Modified Xanthenic Dyes Embedded into Silsesquioxane Hybrid Films: Application in Photooxidation of Organic Molecules

Waiman

Palacios

Montejano

et al. 2017

International Journal of Photoenergy

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“…Previous work on xanthene dyes EY 2À and RB 2À has shown that reductive electron transfer occurs preferentially from the long-lived triplet-state species, which is formed by intersystem crossing (ISC). [52] The reversible potentials for the couples EY À / 3 *EY 2À and RB À / 3 *RB 2À were estimated to be À0.87 and À0.78 V versus SHE at pH 7. [53] These potentials are both more negative than the reduction potential of complex 1 in aqueous SDS solutions (E 1/2 = À0.74 V vs. SHE at pH 7), [43] indicating that the electron transfer from the transient species 3 *EY 2À and 3 *RB 2À to complex 1 is thermodynami- cally favorable.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Hydrogen Production Using Models of the Iron–Iron Hydrogenase Active Site Dispersed in Micellar Solution

2013

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International audienceIron–thiolate complexes of the type [Fe2(μ-bdt)(CO)6−xP(OMe3)x] (bdt=S2C6H4=benzenedithiolate, x≤2) are simplified models of iron–iron hydrogenase enzymes. Recently, we have shown that these water-insoluble organometallic complexes, when included into micelles formed by sodium dodecyl sulfate (SDS), are good catalysts for the electrochemical production of hydrogen in aqueous solutions at pH<6. We herein report that the all-CO derivative [Fe2(μ-bdt)(CO)6] (1), owing to its comparatively low reduction potential, is also a robust molecular catalyst for visible-light-driven production of H2 in aqueous SDS solutions at pH 10.5. Irradiation at λ=455 nm of a system consisting of complex 1, Eosin Y as a sensitizer, and triethylamine as an electron donor produced up to 0.86 mL of H2 in 4.5 h, corresponding to a turnover number of 117 mol of H2 per mol of catalyst. In the presence of a large excess of sensitizer, the production of H2 lasted for more than 30 h, stressing the relative stability of complex 1 under the photocatalytic conditions used herein. Thermodynamic considerations and UV/Vis spectroscopy experiments suggest that the catalytic cycle begins with the photo-driven reduction of complex 1. The reduced intermediate reacts with a proton source to yield iron hydride. Subsequent reduction and protonation steps produce H2, regenerating the starting complex. As a result, the iron–thiolate complex 1 is a versatile proton reduction catalyst that can utilize either solar or electrical energy inputs, providing a starting point for the construction of noble metal-free molecular systems for renewable H2 production

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“…where 1,3 (EY 2− ) * are EY 2− in the singlet and triplet excited states and TEOA •+ is TEOA radical cation [55]. Back electron transfer from EY •3− to TEOA •+ would be inhibited because of the rapid degradation of TEOA •+ .…”

Section: Dye-sensitized H 2 Evolution Under Visible-light Irradiationmentioning

confidence: 99%

“…6c) has six carboxylic groups, which act as efficient anchors on the TiO 2 surface. In the Ruthenizer-470-sensitized Pt/TMC system (pH 3), the excited dye molecules adsorbed on the TMC surface inject electrons into the CB of the TMC as follows: [55,[69][70][71][72] are shown below the arrows.…”

Section: Dye-sensitized H 2 Evolution Under Visible-light Irradiationmentioning

confidence: 99%

Selective photoredox activity on specific facet-dominated TiO2 mesocrystal superstructures incubated with directed nanocrystals

Zhang

Tachikawa

Majima

2015

Applied Catalysis B: Environmental

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Photosensitized Reduction of Methyl Viologen Using Eosin-Y in Presence of a Sacrificial Electron Donor in Water–Alcohol Mixture

Cited by 51 publications

References 27 publications

Photophysical Behavior of Modified Xanthenic Dyes Embedded into Silsesquioxane Hybrid Films: Application in Photooxidation of Organic Molecules

Photophysical Behavior of Modified Xanthenic Dyes Embedded into Silsesquioxane Hybrid Films: Application in Photooxidation of Organic Molecules

Photocatalytic Hydrogen Production Using Models of the Iron–Iron Hydrogenase Active Site Dispersed in Micellar Solution

Selective photoredox activity on specific facet-dominated TiO2 mesocrystal superstructures incubated with directed nanocrystals

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