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 language | English |
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Pages (from-to) | 1944-1948 |
Number of pages | 5 |
Journal | Electroanalysis |
Volume | 16 |
Issue number | 23 |
DOIs | |
Publication status | Published - Dec 2004 |
Externally published | Yes |
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