Nano-structure of polyimide and poly(isobutyl methacrylate) monolayer films studied by interlayer electron transfer between porphyrin and pyromellitic diimide moieties

Ogi, Takeo; Benten, Hiroaki; Ito, Shinzaburo

doi:10.1016/j.tsf.2006.08.013

Cited by 6 publications

(4 citation statements)

References 23 publications

(29 reference statements)

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“…This unfavorable quenching process of the excited state is generally called “self-quenching”. Many researchers have been investigating the self-quenching for constructing efficient photochemical reaction systems. − However, since a self-quenching includes various types of possible mechanisms and we cannot distinguish them definitely, the mechanism of self-quenching has not been revealed entirely.…”

Section: Introductionmentioning

confidence: 99%

“…A self-quenching is a quenching process of excited state molecule due to an interaction between the same types of molecules. The mechanism of the interaction is classified into a static process and a dynamic process. − Under the static process, − an aggregation of molecules is the main factor to induce a self-quenching. Generally an aggregation is defined as an interaction between transition dipole moments of dyes.…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic self-quenching processes can be mainly classified into two kinds of origin, − i.e., (i) an electron transfer reaction and/or an enhanced thermal deactivation process due to the collision of molecules and (ii) a chemical conversion to other compounds. In our system, (ii) is not detected judging from the fact that the absorption spectra are completely the same shape during the irradiation of the excitation light.…”

Section: Introductionmentioning

confidence: 99%

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Regulation of the Collisional Self-Quenching of Fluorescence in Clay/Porphyrin Complex by Strong Host–Guest Interaction

et al. 2012

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This paper proposes a novel methodology to improve noncollisional photochemical reactions such as Förster resonance energy transfer on solid surfaces. Since an excited guest molecule densely adsorbed on the solid surfaces is quenched by an unfavorable interaction between guests in general, the photochemical reactions such as electron and energy transfers tend to be inefficient compared to those in homogeneous systems. In this work, the mechanism of unfavorable quenching process of dyes on the clay surface as a typical solid surface for the photochemical energy transfer was systematically investigated by using a series of porphyrin derivatives. As a result, it was found that the quenching rate constants of excited guest dye determined by the time-resolved fluorescence measurements correlated well with the strengths of coulombic interaction between host and guest. The strong coulombic interaction should suppress the mobility and collision frequency of guests on the clay surface; thus, the collision of guest molecules was revealed as the origin of unfavorable quenching for photochemical reactions on the clay surface. According to this principle, we will be able to construct efficient photochemical reaction systems without any quenching process, such as efficient energy transfers toward an artificial light-harvesting system. In fact, we have already realized almost 100% energy transfer by the suppression of quenching process on the clay surface (e.g., J. Am. Chem. Soc.2011, 133, 14280-14286).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regulation of the Collisional Self-Quenching of Fluorescence in Clay/Porphyrin Complex by Strong Host–Guest Interaction

et al. 2012

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“…The sophisticated architecture of multi-layered LB films has been applied to vectorial electron transfer. Supramolecular system with redox active units [1][2][3] or amphiphilic polymers with photoactive side chains [4][5][6] successfully assembled to achieve the vectorial electron transfer.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Photochemical Characterization of Organic Dye-Metal Oxide Hybrid Langmuir Blodgett Film

Usami

Sasaki

2013

J. Photopol. Sci. Technol.

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Langmuir-Blodgett (LB) film of tetra-t-butyl-Zn-phthalocyanine (Pc), dicitratodiperoxotitanate complex (TAS) and ditetradecylviologen (V) triad was fabricated on thin glass waveguide as a cascade electron transfer model. The arrangement of the layer as Pc-TAS-V was successfully controlled by LB process. Monolayer of Pc or V was stabilized with TAS layer due to a multiple electrostatic interaction at air-water interface. Photoinduced electron transfer from the Pc to V through the TAS layer in Pc-TAS-V triad system was measured directly using waveguide spectroscopy. Electron transfer in the opposite layering sequence, V-TAS-Pc, was negligible. According to these results, direction of the electron transfer can be controlled in the triad by controlling the layering sequence using the hybrid LB procedure.

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Langmuir–Blodgett Films of Porphyrins for Applications in Photovoltaics

Bettini

Valli

Giancane

2014

Topics in Heterocyclic Chemistry

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Nano-structure of polyimide and poly(isobutyl methacrylate) monolayer films studied by interlayer electron transfer between porphyrin and pyromellitic diimide moieties

Cited by 6 publications

References 23 publications

Regulation of the Collisional Self-Quenching of Fluorescence in Clay/Porphyrin Complex by Strong Host–Guest Interaction

Regulation of the Collisional Self-Quenching of Fluorescence in Clay/Porphyrin Complex by Strong Host–Guest Interaction

Fabrication and Photochemical Characterization of Organic Dye-Metal Oxide Hybrid Langmuir Blodgett Film

Langmuir–Blodgett Films of Porphyrins for Applications in Photovoltaics

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