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Oxygen-sensitive layers for optical fibre devices

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Abstract

The spectroscopic features and photoreactivity with oxygen of a novel, highly lipophilic, luminescent metal complex Ru(5-odap) 2+3 (where 5-odap stands for 5-octadecanamide-1,10-phenanthroline), are reported and compared to those of the well-known tris(1,10-phenanthroline) analogue. An array of silicone membranes, containing Ru(5-odap) 2+3 or Ru(φ2p) 2+3 (where φ2p stands for 4,7-diphenyl-1,10-phenanthroline) as solid-supported luminescent indicators, have been fabricated. Their (non-linear) response to oxygen was evaluated with fibre-optics as a function of their adsorbent nature (silica gel, glass, reverse-phase silica, styrene/divinyl benzene copolymer, or none), surface coverage by the deposited metal complex, and loading of dyed support into the sensitive layer. The largest oxygen sensitivity (I 0/I ca. 6 for a partial pressure of 130 Torr) is achieved with the highest amount of silica gel- or glass-supported Ru(φ2p) 2+3 and the highest membrane loading. Ru(5-odap) 2+3 dissolved directly into silicone yields a linear dose/response plot, but with a small slope (I 0 /I ca. 1.4 for a partial pressure of 720 Torr). These results are discussed in terms of dynamic surface quenching between the co-adsorbed indicator and oxygen molecules.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, Universidad Complutense de Madrid, E-28040, Madrid, Spain

    Francisco J. Mingoarranz & María C. Moreno-Bondi

  2. Department of Organic Chemistry, Faculty of Chemistry, Universidad Complutense de Madrid, E-28040, Madrid, Spain

    David García-Fresnadillo, César de Dios & Guillermo Orellana

Authors
  1. Francisco J. Mingoarranz
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  2. María C. Moreno-Bondi
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  3. David García-Fresnadillo
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  4. César de Dios
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  5. Guillermo Orellana
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Mingoarranz, F.J., Moreno-Bondi, M.C., García-Fresnadillo, D. et al. Oxygen-sensitive layers for optical fibre devices. Mikrochim Acta 121, 107–118 (1995). https://doi.org/10.1007/BF01248245

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  • DOI: https://doi.org/10.1007/BF01248245

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