Novel molecular optical memory of luminescent Langmuir-Blodgett films

Fujihira, Masamichi; Kamei, Takahiro; Sakomura, Masaru; Tatsu, Yoshiro; Kato, Yutaka

doi:10.1016/0040-6090(89)90225-3

Cited by 21 publications

(3 citation statements)

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“…Isolation and purification of isomers was so difficult and wasteful that we have employed the mixture of the two regioisomers in further studies of compound 4 . In addition, use of the mixture was expected to discourage crystallization and thus phase separation in mixed LB monolayers …”

Section: Resultsmentioning

confidence: 99%

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Dynamics of Photoinduced Electron Transfer in an Amphiphilic A²⁺-S-D Triad Molecule

et al. 2002

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An amphiphilic A 2+ -S-D triad molecule and its reference compounds, S-D, A 2+ -S, and S type molecules, were synthesized and studied using time-resolved transient absorption spectroscopy. The three moieties in the triad, i.e., an electron acceptor moiety (A 2+ , viologen), a sensitizer moiety (S, perylene), and an electron donor moiety (D, ferrocene), were linearly combined by sigma-bonded tunneling bridges. Intramolecular electron transfer reactions were initiated by photoexcitation of the S moiety to 1 S*, and the long-lived final charge separated state, A •+ -S-D •+ , was formed. Although the yield of the initial charge separated state, A •+ -S •+ -D, was very high (0.93), the overall yield of the final charge separated state was ca. 0.2. The rate of the backward electron transfer from A •+ to S •+ was observed to be two times lower than that of the forward electron transfer from 1 S* to A 2+ , suggesting that with suitable molecular engineering, the yield of long-lived charge separation in such triads could be improved. † Part of the special issue "Noboru Mataga Festschrift".

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Section: Resultsmentioning

confidence: 99%

“…In addition, use of the mixture was expected to discourage crystallization and thus phase separation in mixed LB monolayers. 39 Similarly, each of the compounds 1-3 was obtained as a mixture of the corresponding two regioisomers. In any of these compounds, the molar ratio of the two regioisomers was also ca.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of Photoinduced Electron Transfer in an Amphiphilic A²⁺-S-D Triad Molecule

et al. 2002

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“…The two substituents on the Py ring were introduced by repeating Friedel-Crafts acylation reaction twice, which afforded a mixture of three regioisomers (1,3-, 1,6-, and 1,8-disubstituted Py compounds). In our previous studies [6][7][8][9], we had used the regioisomeric mixture to fabricate LB films because of difficulties in purification. The emissions from the LB monolayers of the regioisomeric mixture consisted of normal monomer and excimer emissions, which is probably due to the homogeneous dispersion of each regioisomer.…”

Section: Methodsmentioning

confidence: 99%

Unique fluorescence spectra of a disubstituted pyrene surfactant in Langmuir–Blodgett films

Sakomura¹,

Nakashima²,

Ueda³

et al. 2006

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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We first observed an unique pyrene (Py) emission from 10-(1-(6-hexyl)pyrenyl)decanoic acid (1,6-HPDA) Langmuir-Blodgett (LB) films. In the fluorescence spectra of the 1,6-HPDA LB films, the normal bands of monomer and excimer emission of Py were absent but the new structured emission band with peaks at Manuscript 422, 448, and 473 nm was observed. Besides the intensity, the shape of the characteristic structured emission band at shorter wavelengths than normal excimers did not changed essentially on lowering the Py concentration in the LB monolayer from 100 mol% to 1mol%. The spectroscopic studies on HPDA LB films of a variety of Py concentrations suggested that a novel excimer responsible for the structured new emission would be efficiently formed by photo-excitation of a Py-Py pre-associated dimer in different manners than those of normal excimer formations.

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Layered Metal Phosphonates as Potential Materials for the Design and Construction of Molecular Photosynthetic Systems

Vermeulen

1996

Progress in Inorganic Chemistry

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Novel molecular optical memory of luminescent Langmuir-Blodgett films

Cited by 21 publications

References 10 publications

Dynamics of Photoinduced Electron Transfer in an Amphiphilic A²⁺-S-D Triad Molecule

Dynamics of Photoinduced Electron Transfer in an Amphiphilic A²⁺-S-D Triad Molecule

Unique fluorescence spectra of a disubstituted pyrene surfactant in Langmuir–Blodgett films

Layered Metal Phosphonates as Potential Materials for the Design and Construction of Molecular Photosynthetic Systems

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Novel molecular optical memory of luminescent Langmuir-Blodgett films

Cited by 21 publications

References 10 publications

Dynamics of Photoinduced Electron Transfer in an Amphiphilic A2+-S-D Triad Molecule

Dynamics of Photoinduced Electron Transfer in an Amphiphilic A2+-S-D Triad Molecule

Unique fluorescence spectra of a disubstituted pyrene surfactant in Langmuir–Blodgett films

Layered Metal Phosphonates as Potential Materials for the Design and Construction of Molecular Photosynthetic Systems

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Dynamics of Photoinduced Electron Transfer in an Amphiphilic A²⁺-S-D Triad Molecule

Dynamics of Photoinduced Electron Transfer in an Amphiphilic A²⁺-S-D Triad Molecule