Optical solid-state oxygen sensors using metalloporphyrin complexes immobilized in suitable polymeric matrices

Abstract Porphyrins based on platinum(II) (PtOEP), palladium(II) (PdOEP) octaethylporphyrin and Ru(II) (RuOEP) octaethylporphyrin pyridyl carbonyl are immobilized in poly(ethylene glycol)ethyl ether methacrylate (pPEGMA) solid matrices, which possess two different average molecular weights. The phosphorescence quenching by molecular oxygen in the resulting sensors is studied. Our results point out that PdOEP-based devices exhibit higher sensitivity towards O2 but have a lower photostability than PtOEP samples. Whereas, RuOEP shows evident photodegradation and poor sensitivity compared to the other lumophores tested. A comparison between the polymeric supports having distinct viscosity shows that the less viscous medium produces better performances of the resulting device. In particular, the decreasing average molecular weight, than the viscosity, of the polymer produces effects quite similar to those obtained with the use of a plasticizer. Finally, all systems analyzed in this work exhibit linear Stern–Volmer response and similar slopes are found at different emission wavelengths, suggesting that the chromophores are quite homogeneously dispersed in pPEGMA.

[1]  J. Demas,et al.  Oxygen sensors based on luminescence quenching of metal complexes:  osmium complexes suitable for laser diode excitation. , 1996, Analytical chemistry.

[2]  M. Lanza,et al.  Luminescent RuII‐polypyridine complexes in poly‐2‐hydroxyethylmethacrylate matrices as oxygen sensors , 1995 .

[3]  Gelii V. Ponomarev,et al.  Phosphorescent Complexes of Porphyrin Ketones: Optical Properties and Application to Oxygen Sensing , 1995 .

[4]  J. Demas,et al.  Oxygen sensors based on luminescence quenching: interactions of pyrene with the polymer supports. , 1995, Analytical chemistry.

[5]  P. Hawkins,et al.  A fibre-optic oxygen sensor based on contact charge-transfer absorption , 1996 .

[6]  I. Okura,et al.  Optical Sensor for Oxygen Using a Porphyrin-doped Sol-Gel Glass , 1997 .

[7]  A. Lepre,et al.  Controlling the Response Characteristics of Luminescent Porphyrin Plastic Film Sensors for Oxygen , 1997 .

[8]  M. Lanza,et al.  Luminescent Mononuclear and Dinuclear Iridium(III) Cyclometalated Complexes Immobilized in a Polymeric Matrix as Solid-State Oxygen Sensors. , 1998, Analytical chemistry.

[9]  I. Bergman,et al.  Rapid-response Atmospheric Oxygen Monitor based on Fluorescence Quenching , 1968, Nature.

[10]  Francesco Baldini,et al.  Optical fiber sensor for oxygen detection working on an absorption basis , 1992 .

[11]  Sebastiano Campagna,et al.  A luminescent iridium(III) cyclometallated complex immobilized in a polymeric matrix as a solid‐state oxygen sensor , 1996 .

[12]  A. Mills.  Effect of plasticizer viscosity on the sensitivity of an [Ru(bpy)32+(Ph4B–)2]-based optical oxygen sensor , 1998 .

[13]  J. Demas,et al.  Oxygen sensors based on luminescence quenching: interactions of metal complexes with the polymer supports. , 1994, Analytical chemistry.

[14]  Benjamin A. DeGraff,et al.  Photophysics and photochemistry of oxygen sensors based on luminescent transition-metal complexes , 1991 .

[15]  Max E. Lippitsch,et al.  Luminescence Quenching Behavior of an Oxygen Sensor Based on a Ru(II) Complex Dissolved in Polystyrene , 1995 .

[16]  R. Vandeloise,et al.  Fibre-optic oxygen sensor based on luminescence quenching of a Pt(II) complex embedded in polymer matrices , 1996 .

[17]  Colette McDonagh,et al.  Dissolved oxygen sensor based on fluorescence quenching of oxygen-sensitive ruthenium complexes immobilized in sol–gel-derived porous silica coatings , 1996 .

[18]  N. Opitz,et al.  Oxygen sensor for the temperature range 300 to 500 K based on fluorescence quenching of indicator-treated silicone rubber membranes☆ , 1988 .

[19]  Brendan C. O'Kelly,et al.  Fibre optic oxygen sensor based on fluorescence quenching of evanescent-wave excited ruthenium complexes in sol–gel derived porous coatings , 1993 .

[20]  Vladimir Evguenyevich Mosharov,et al.  Set of luminescence pressure sensors for aerospace research , 1993 .