Novel optical trace oxygen sensors based on platinum(II) and palladium(II) complexes with 5,10,15,20-meso-tetrakis-(2,3,4,5,6-pentafluorphenyl)-porphyrin covalently immobilized on silica-gel particles

Sergey M Borisov; Philipp Lehner; Ingo Klimant

doi:10.1016/j.aca.2011.01.057

Novel optical trace oxygen sensors based on platinum(II) and palladium(II) complexes with 5,10,15,20-meso-tetrakis-(2,3,4,5,6-pentafluorphenyl)-porphyrin covalently immobilized on silica-gel particles

Anal Chim Acta. 2011 Mar 25;690(1):108-15. doi: 10.1016/j.aca.2011.01.057. Epub 2011 Feb 23.

Authors

Sergey M Borisov¹, Philipp Lehner, Ingo Klimant

Affiliation

¹ Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria. sergey.borisov@tugraz.at

PMID: 21414443
DOI: 10.1016/j.aca.2011.01.057

Abstract

New optical sensors for trace amounts of oxygen are based on platinum(II) and palladium(II) complexes of 5,10,15,20-meso-tetrakis-(2,3,4,5,6-pentafluorphenyl)-porphyrin covalently attached to the surface of amino-modified silica-gel particles. The dye-doped silica-gel particles are dispersed in silicone rubber. The Stern-Volmer plots show linear response and are virtually identical for either luminescence intensity and decay time. Other features include high photostability and rapid response times (∼150 ms in gas phase). The sensors based on the palladium(II) complex show significantly higher sensitivity (K(SV) about 67 kPa(-1) at 25 °C) with the dynamic range from 0.02 to 100 Pa. The sensitivity of the platinum(II) complexes is significantly lower (K(SV)=3.7-4.2 kPa(-1), dynamic range 0.3-1000 Pa). The sensors can be suitable for application in breweries, water boilers and for marine research (monitoring of oxygen minimum zones).