Synthesis of montmorillonite-viologen intercalation compounds and their photochromic behaviour

Hirokatsu Miyata, Yoshiyuki Sugahara, Kazuyuki Kuroda, Chuzo Kato

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    Abstract

    The photochemical properties of four different viologen di-cations (V2+,1,1′-dipropyl-, 1,1′-diheptyl-, 1,1′-diphenylmethyl- and 1,1′-diphenylethyl-4,4′-bipyridinium di-cations) intercalated into the interlayer space of montmorillonite have been studied. The colour of the intercalation compounds which were co-intercalated by poly(vinyl pyrrolidone) (PVP) changed to blue when irradiated by a mercury lamp, showing the formation of the radical cations. Their characteristic absorptions appeared at ca. 610 and 400 nm in their visible spectra. Since the viologens were present in their cationic forms in the interlayer space it was thought that PVP acted as an electron donor for the photochemical reduction of the viologens. The intensity decay of the radical cations was very slow in comparison with the species in PVP matrices, indicating their remarkable stability.

    Original languageEnglish
    Pages (from-to)1851-1858
    Number of pages8
    JournalJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
    Volume83
    Issue number6
    DOIs
    Publication statusPublished - 1987

    Fingerprint

    Viologens
    Bentonite
    Intercalation compounds
    montmorillonite
    intercalation
    Cations
    cations
    synthesis
    interlayers
    Mercury vapor lamps
    Pyrrolidinones
    mercury lamps
    visible spectrum
    Color
    color
    Electrons
    decay
    matrices
    electrons

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

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    title = "Synthesis of montmorillonite-viologen intercalation compounds and their photochromic behaviour",
    abstract = "The photochemical properties of four different viologen di-cations (V2+,1,1′-dipropyl-, 1,1′-diheptyl-, 1,1′-diphenylmethyl- and 1,1′-diphenylethyl-4,4′-bipyridinium di-cations) intercalated into the interlayer space of montmorillonite have been studied. The colour of the intercalation compounds which were co-intercalated by poly(vinyl pyrrolidone) (PVP) changed to blue when irradiated by a mercury lamp, showing the formation of the radical cations. Their characteristic absorptions appeared at ca. 610 and 400 nm in their visible spectra. Since the viologens were present in their cationic forms in the interlayer space it was thought that PVP acted as an electron donor for the photochemical reduction of the viologens. The intensity decay of the radical cations was very slow in comparison with the species in PVP matrices, indicating their remarkable stability.",
    author = "Hirokatsu Miyata and Yoshiyuki Sugahara and Kazuyuki Kuroda and Chuzo Kato",
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    T1 - Synthesis of montmorillonite-viologen intercalation compounds and their photochromic behaviour

    AU - Miyata, Hirokatsu

    AU - Sugahara, Yoshiyuki

    AU - Kuroda, Kazuyuki

    AU - Kato, Chuzo

    PY - 1987

    Y1 - 1987

    N2 - The photochemical properties of four different viologen di-cations (V2+,1,1′-dipropyl-, 1,1′-diheptyl-, 1,1′-diphenylmethyl- and 1,1′-diphenylethyl-4,4′-bipyridinium di-cations) intercalated into the interlayer space of montmorillonite have been studied. The colour of the intercalation compounds which were co-intercalated by poly(vinyl pyrrolidone) (PVP) changed to blue when irradiated by a mercury lamp, showing the formation of the radical cations. Their characteristic absorptions appeared at ca. 610 and 400 nm in their visible spectra. Since the viologens were present in their cationic forms in the interlayer space it was thought that PVP acted as an electron donor for the photochemical reduction of the viologens. The intensity decay of the radical cations was very slow in comparison with the species in PVP matrices, indicating their remarkable stability.

    AB - The photochemical properties of four different viologen di-cations (V2+,1,1′-dipropyl-, 1,1′-diheptyl-, 1,1′-diphenylmethyl- and 1,1′-diphenylethyl-4,4′-bipyridinium di-cations) intercalated into the interlayer space of montmorillonite have been studied. The colour of the intercalation compounds which were co-intercalated by poly(vinyl pyrrolidone) (PVP) changed to blue when irradiated by a mercury lamp, showing the formation of the radical cations. Their characteristic absorptions appeared at ca. 610 and 400 nm in their visible spectra. Since the viologens were present in their cationic forms in the interlayer space it was thought that PVP acted as an electron donor for the photochemical reduction of the viologens. The intensity decay of the radical cations was very slow in comparison with the species in PVP matrices, indicating their remarkable stability.

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