Oxygen-sensitive reverse-phase optode membrane using silica gel-adsorbed ruthenium(II) complex embedded in gelatin film

Martin M F CHOI*, Dan Xiao

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

40 Citations (Scopus)

Abstract

An oxygen-sensitive reverse-phase optode membrane consisting of tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ditetrakis(4-chlorophenyl)borate adsorbed on silica gel and embedded in a gelatin film has been successfully fabricated and used to continuously monitor dissolved oxygen in organic solvents. The optode membrane shows a very strong and stable pink emission when excited by blue light and it is efficiently quenched by molecular oxygen. The response of the sensor displays typical nonlinear Stern-Volmer behaviour when the dissolved oxygen concentration in organic solvents is at high levels. But the sensor is most sensitive at lower oxygen levels and is linear in the range 0-1.14, 0-2.10 and 0-0.53mM for dissolved oxygen in acetone, dimethyl formamide and toluene, respectively. The t95 response times of the sensor are 10s on going from nitrogen-saturated toluene to air-saturated toluene and 22s on going from air-saturated toluene to nitrogen-saturated toluene. The sensor has good reproducibility, high photostability, no hysteresis, good precision and long lifetime. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)197-205
Number of pages9
JournalAnalytica Chimica Acta
Volume387
Issue number2
DOIs
Publication statusPublished - 22 Apr 1999

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

User-Defined Keywords

  • Dissolved oxygen
  • Organic solvents
  • Reverse-phase optode membrane
  • Ruthenium(II) complex

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