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Organic phase cyclopentadienylnickelthiolate sensor system for electrochemical determination of sulfur dioxide

Morrin, Aoife and Moutloali, Richard M. and Killard, Anthony J. and Smyth, Malcolm R. and Darkwa, James and Iwuoha, Emmanuel I. (2004) Organic phase cyclopentadienylnickelthiolate sensor system for electrochemical determination of sulfur dioxide. Electronanalysis, 16 (23). pp. 1944-1948. ISSN 1040-0397

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A series of cyclopentadienylnickelthiolate complexes, [Ni(PBu3)(h 5 -C5H5)(SC6H4X-4)] (X ¼ 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 CH2Cl2/0.1 M [n-Bu4N][BF4]. The formal potentials (E8’) values of the compounds ranged from 265 to 431 mV/Ag-AgCl depending on the para substituent of the benzene thiolate ligand. Electrochemical, UVvis and 1 H 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 E8’ values of the Ni II/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 SO2 for the fluoro complex, while the linear range was as high as 700 – 2000 ppm SO2 for the amino complex.

Item Type:Article (Published)
Uncontrolled Keywords:sulfur dioxide determination; electrochemical sulfur dioxide sensor; organic phase sulfur dioxide sensor; cyclopentadienylnickelthiolate complex; potentiometric SO2 sensor;
Subjects:Physical Sciences > Chemical detectors
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:John Wiley & Sons
Official URL:
ID Code:40
Deposited On:08 Nov 2006 by DORAS Administrator. Last Modified 30 Jan 2009 11:13

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