Preparation of lamellar inorganic-organic hybrids from tetraethoxysilane and a coumarin derivative containing a triethoxysilyl group and photodimerization of the interlayer coumarin groups

Shintaro Nasu, Ayako Tsuchiya, Kazuyuki Kuroda

    研究成果: Article

    7 引用 (Scopus)

    抄録

    Lamellar inorganic-organic hybrids were prepared as powders and films via hydrolysis and cocondensation of tetraethoxysilane (TEOS) and a coumarin derivative containing a triethoxysilyl group. The formation of lamellar structures consisting of siloxane layers and interlayer coumarin groups with ca. 4 nm periodicities, revealed by XRD and TEM, is induced by self-assembly of the oligomeric species derived from TEOS and the derivative. The UV-vis absorption spectrum of the as-synthesized hybrid film showed an absorption maximum blue-shifted from that observed for a CHCl3 solution of the monomeric coumarin derivative, which supports the formation of a face-to-face structure of the interlayer coumarin groups. Dimerization of the coumarin groups occurred by irradiation with visible light (>310 nm). The groups in the lamellar hybrid film showed faster dimerization and the yield of dimers was higher, if compared with those in a disordered hybrid film and the neat coumarin derivative, indicating the efficient dimerization of the chromophores with a controlled arrangement. The molecular design of a coumarin derivative strongly influences the property of hybrids as well as the mesostructural formation.

    元の言語English
    ページ(範囲)6688-6695
    ページ数8
    ジャーナルJournal of Materials Chemistry
    20
    発行部数32
    DOI
    出版物ステータスPublished - 2010 8 28

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    Coumarins
    Dimerization
    Derivatives
    Polymers
    Siloxanes
    Lamellar structures
    Chromophores
    Dimers
    Powders
    Self assembly
    Absorption spectra
    Hydrolysis
    Irradiation
    Transmission electron microscopy
    coumarin
    tetraethoxysilane

    ASJC Scopus subject areas

    • Materials Chemistry
    • Chemistry(all)

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