Controlled spatial distribution of tris(2,2′-bipyridine)ruthenium cation ([Ru(bpy)3]2+) in aluminum containing mesoporous silicas

Minoru Sohmiya, Makoto Ogawa

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    The adsorption of tris(2,2′-bipyridine)ruthenium(II) ([Ru(bpy) 3]2+) onto aluminum containing mesoporous silicas (BJH pore size of 2.2 and 3.0 nm and Si/Al ratio of ca. 26) was conducted and the photoluminescence of the products was examined as a function of the loaded [Ru(bpy)3]2+ amounts. The loading amount of the complex was controlled below ca. 0.1 mol L-1 based on the pore volume by changing the initial concentration of the [Ru(bpy)3]2+ ethanol solutions used for the adsorption, resulted from the strong host-guest interactions as evidenced by the H type adsorption isotherm. The concentration dependence of the luminescence intensity was discussed to show the self-quenching process of the complex in the mesopore. The Quasi Stern-Volmer plots showed a linear relationship, suggesting that the spatial distribution of [Ru(bpy)3]2+ was successfully varied in the mesopore by the loading amount of [Ru(bpy)3]2+, even at the high concentration of the complex in the mesopore (ca. 0.1 mol L-1 based on the pore volume). The difference of the self-quenching efficiencies (coefficients of self-quenching, Ksv values) of [Ru(bpy) 3]2+ adsorbed on aluminum containing mesoporous silicas from that on the mesoporous silica modified with phenethylsulfonic group [M. Sohmiya, Y. Sugahara, M. Ogawa, J. Phys. Chem. B 111 (2007) 8836-8841] suggests that the pore size and the interactions between [Ru(bpy)3] 2+ and the pore surface affects the efficiency; the larger pore size and the weaker interactions between [Ru(bpy)3]2+ and the pore surface results in the higher self-quenching efficiency.

    Original languageEnglish
    Pages (from-to)363-370
    Number of pages8
    JournalMicroporous and Mesoporous Materials
    Volume142
    Issue number1
    DOIs
    Publication statusPublished - 2011 Jun

    Fingerprint

    Ruthenium
    Aluminum
    Silicon Dioxide
    Spatial distribution
    ruthenium
    Cations
    Quenching
    spatial distribution
    Positive ions
    Silica
    silicon dioxide
    Pore size
    aluminum
    porosity
    cations
    quenching
    Adsorption
    adsorption
    Adsorption isotherms
    Luminescence

    Keywords

    • Luminescence
    • MCM-41
    • Mesoporous silica
    • Photochemistry
    • Tris(2,2-bipyridine)ruthenium(II)

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Chemistry(all)
    • Condensed Matter Physics

    Cite this

    Controlled spatial distribution of tris(2,2′-bipyridine)ruthenium cation ([Ru(bpy)3]2+) in aluminum containing mesoporous silicas. / Sohmiya, Minoru; Ogawa, Makoto.

    In: Microporous and Mesoporous Materials, Vol. 142, No. 1, 06.2011, p. 363-370.

    Research output: Contribution to journalArticle

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    AB - The adsorption of tris(2,2′-bipyridine)ruthenium(II) ([Ru(bpy) 3]2+) onto aluminum containing mesoporous silicas (BJH pore size of 2.2 and 3.0 nm and Si/Al ratio of ca. 26) was conducted and the photoluminescence of the products was examined as a function of the loaded [Ru(bpy)3]2+ amounts. The loading amount of the complex was controlled below ca. 0.1 mol L-1 based on the pore volume by changing the initial concentration of the [Ru(bpy)3]2+ ethanol solutions used for the adsorption, resulted from the strong host-guest interactions as evidenced by the H type adsorption isotherm. The concentration dependence of the luminescence intensity was discussed to show the self-quenching process of the complex in the mesopore. The Quasi Stern-Volmer plots showed a linear relationship, suggesting that the spatial distribution of [Ru(bpy)3]2+ was successfully varied in the mesopore by the loading amount of [Ru(bpy)3]2+, even at the high concentration of the complex in the mesopore (ca. 0.1 mol L-1 based on the pore volume). The difference of the self-quenching efficiencies (coefficients of self-quenching, Ksv values) of [Ru(bpy) 3]2+ adsorbed on aluminum containing mesoporous silicas from that on the mesoporous silica modified with phenethylsulfonic group [M. Sohmiya, Y. Sugahara, M. Ogawa, J. Phys. Chem. B 111 (2007) 8836-8841] suggests that the pore size and the interactions between [Ru(bpy)3] 2+ and the pore surface affects the efficiency; the larger pore size and the weaker interactions between [Ru(bpy)3]2+ and the pore surface results in the higher self-quenching efficiency.

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