ISSN:
1436-5073
Keywords:
fibre-optic sensors
;
luminescent ruthenium(II) complexes
;
oxygen
;
silicone membranes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The spectroscopic features and photoreactivity with oxygen of a novel, highly lipophilic, luminescent metal complex Ru(5-odap) 3 2+ (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) 3 2+ or Ru(φ2p) 3 2+ (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) 3 2+ and the highest membrane loading. Ru(5-odap) 3 2+ 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01248245
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