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Optical Oxygen Sensing Properties of Mesoporous SBA-15 with a Covalently Grafted Ruthenium(Ⅱ) Complex

ZHANG Hao-Ran1, LI Bin2*, LEI Bing-Fu2, LI Wen-Lian2   

    1. Faculty of Chemistry, Northeast Normal University, Changchun 130024, China;
    2. Key Laboratory of Excited State Processes, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
  • Received:2007-06-01 Revised:1900-01-01 Online:2007-10-10 Published:2007-10-10
  • Contact: LI Bin

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Abstract: Novel oxygen sensing materials consisted of [Ru(Phen)3]2+ portion covalently grafted to the functionalized mesoporous SBA-15 backbones are prepared by co-condensation of tetraethoxysilane(TEOS) and the functionalized Ru(Ⅱ) complex [Ru(Phen)2Phen—Si]2+ in the presence of Pluronic P123 surfactant as a template. The obtained oxygen sensing materials are characterized by Fourier transform infrared(FTIR) and luminescence intensity quenching Stern-Volmer curves. The Demas and Lehrer models are used to fit the obtained nonlinear Stern-Volmer curves. The functionalized mesoporous sensing materials appear to be highly sensitive to the O2 concentration in N2. The results show that the covalently-grafted sample shows reversible signals and higher photochemical stability since these Ru(Ⅱ) molecules are strongly covalently-grafted to the Si—O network via the CH2—Si bonds.

Key words: Oxygen sensing, Covalent grafting, Mesoporous molecular sieve, Ruthenium(Ⅱ) complex

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