Photoinduced electron transfer from pyrene to methylviologen in polystyrene latex dispersions as studied by diffuse reflectance laser flash photolysis

Nakashima, Kenichi; Miyamoto, Tsuyoshi; Hashimoto, Shuichi

doi:10.1039/a807368f

Cited by 12 publications

(10 citation statements)

References 13 publications

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“…Electron transfer from the excited states of PY to MV 2+ is well-documented in the literature, − and hence, the fluorescence quenching seen in Figure is attributed to PET according to Scheme .…”

Section: Resultsmentioning

confidence: 55%

Photoinduced Electron Transfer in a Self-Assembled Bis(β-cyclodextrin)-Linked Pyrene/Bis(adamantane)-Linked Methyl Viologen Donor–Acceptor System in Aqueous Solution

Jeevan

Gopidas

2021

J. Phys. Chem. B

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Pyrene linked to two β-CD (CD = cyclodextrin; PY = pyrene) molecules (CD-PY-CD) and methylviologen (MV2+) linked to two adamantane (AD) groups (AD-MV2+-AD) self-assembled in water to give toroidal nanostructures. Photoprocesses taking place in the femtosecond and nanosecond time ranges within the assembly are reported. Fluorescence of the pyrene chromophore was quenched in the toroid, suggesting very efficient electron transfer. Fast quenching of the pyrene fluorescence with a time constant of 6.85 ns was attributed to photoinduced electron transfer from pyrene to methyl viologen within the toroid assembly. Electron transfer leads to the formation of radical ion products, PY•+ and MV•+, which were identified in the nanosecond transient absorption spectra. Because of the close packing of chromophores, the radical ions undergo fast reactions with chromophores or similar ions in adjacent stacks to give dimeric products. Since the dimeric species are not very stable, the reactions are reversed at longer time scales to generate the radical ions, which then undergo back electron transfer and regenerate the starting materials.

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Section: Resultsmentioning

confidence: 55%

Photoinduced Electron Transfer in a Self-Assembled Bis(β-cyclodextrin)-Linked Pyrene/Bis(adamantane)-Linked Methyl Viologen Donor–Acceptor System in Aqueous Solution

Jeevan

Gopidas

2021

J. Phys. Chem. B

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“…The rate of thermal reverse electron transfer is usually very high, which precludes the use of these systems for solar energy conversion. However, it has been shown that stabilization of viologen radical cations can be achieved by their incorporation to solid matrices, such as zeolites, , polymers, , Langmuir–Blodgett monolayers, crystal frameworks, − and hybrid structures. − …”

Section: Introductionmentioning

confidence: 99%

Bambusuril as a One-Electron Donor for Photoinduced Electron Transfer to Methyl Viologen in Mixed Crystals

et al. 2017

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Methyl viologen hexafluorophosphate (MV·2PF) and dodecamethylbambus[6]uril (BU6) form crystals in which the layers of viologen dications alternate with those of a 1:2 supramolecular complex of BU6 and PF. This arrangement allows for a one-electron reduction of MV ions upon UV irradiation to form MV radical cations within the crystal structure with half-lives of several hours in air. The mechanism of this photoinduced electron transfer in the solid state and the origin of the long-lived charge-separated state were studied by steady-state and transient spectroscopies, cyclic voltammetry, and electron paramagnetic resonance spectroscopy. Our experiments are supported by quantum-chemical calculations showing that BU6 acts as a reductant. In addition, analogous photochemical behavior is also demonstrated on other MV/BU6 crystals containing either BF or Br counterions.

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“…Polystyrene latex (PSL) particles are solid nano-or microspheres with functional groups attached on the surfaces. 1 Latexes have many applications in coatings, 2 biomedical diagnostics 3 and drug delivery. 4 They are used also as model systems in colloid research because of their well-defined physicochemical characteristics.…”

mentioning

confidence: 99%

Penetration of pyrene and its derivatives into polystyrene latex particles as studied by fluorescence spectroscopy

Gong

Nakashima

2001

Chem. Commun.

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Photoinduced electron transfer from pyrene to methylviologen in polystyrene latex dispersions as studied by diffuse reflectance laser flash photolysis

Cited by 12 publications

References 13 publications

Photoinduced Electron Transfer in a Self-Assembled Bis(β-cyclodextrin)-Linked Pyrene/Bis(adamantane)-Linked Methyl Viologen Donor–Acceptor System in Aqueous Solution

Photoinduced Electron Transfer in a Self-Assembled Bis(β-cyclodextrin)-Linked Pyrene/Bis(adamantane)-Linked Methyl Viologen Donor–Acceptor System in Aqueous Solution

Bambusuril as a One-Electron Donor for Photoinduced Electron Transfer to Methyl Viologen in Mixed Crystals

Penetration of pyrene and its derivatives into polystyrene latex particles as studied by fluorescence spectroscopy

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