Polystyrene Immobilized Ir(III) Complex as a new Material for Optical Oxygen Sensing

The luminescence spectra of tris(phenylpyridine)iridium embedded in Amberlite (polystyrene adsorbent) have been measured under various O2/N2 mixtures (total pressure = 1 atm). It is shown that the Stern‐Volmer plots are downward curved and that the curvature can be explained either by a two‐site model or by a negative deviation from Henry's law. A curve fitting procedure cannot distinguish between the two models. Using a frequency modulated blue LED and a fiber optic set‐up, O2 partial pressure of 0.4 mbar could be detected. Oxygen can be determined at 200 mbar with a 1.5% accuracy. Copyright © 1994 Wiley‐VCH Verlag GmbH & Co. KGaA, WeinheimSCOPUS: ar.j