Organic phase cyclopentadienylnickelthiolate sensor system for electrochemical determination of sulfur dioxide

Aoife Morrin, Richard M. Moutloali, Anthony J. Killard, Malcolm R. Smyth, James Darkwa, Emmanuel I. Iwuoha

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A series of cyclopentadienylnickelthiolate complexes, [Ni(PBu 3)(η5-C5H5)(SC 6,H4X-4)] (X = F, Cl, Br, NH2), were shown to express stable reversible electrochemical properties even after formation of SO2 adducts in organic phase consisting of argon purged CH 2Cl2/0.1 M [n-Bu4N][BF4]. The formal potentials (Eo′) values of the compounds ranged from 265 to 431 mV/Ag-AgCl depending on the para substituent of the benzene thiolate ligand. Electrochemical, UV-vis and 1H NMR spectroscopic analyses show that the formation of SO2 adducts causes the perturbation of the electronic density of the nickel metal center, indicated by shifts in the E o′ values of the NiII/III redox couple that is dependent on SO2 concentration. The detection limits of the resulting organic phase electrochemical gas sensor system was as low as 0.56 ppm SO 2 for the fluoro complex, while the linear range was as high as 700-2000 ppm SO2 for the amino complex.

Original languageEnglish
Pages (from-to)1944-1948
Number of pages5
JournalElectroanalysis
Volume16
Issue number23
DOIs
Publication statusPublished - Dec 2004
Externally publishedYes

Keywords

  • Cyclopentadienylnickelthiolate complex
  • Electrochemical sulfur dioxide sensor
  • Organic phase sulfur dioxide sensor
  • Potentiometric SO sensor
  • Sulfur dioxide determination

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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