A kineto-optical method for the determination of chlorine gas

Baron, M. G., Narayanaswamy, R. and Thorpe, S. C. (1995) A kineto-optical method for the determination of chlorine gas. Sensors and Actuators: B. Chemical, 29 (1-3). pp. 358-362. ISSN 0925-4005

Full content URL: http://dx.doi.org/10.1016/0925-4005(95)01707-0

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The redox and optical properties of porphyrins make them particularly interesting and useful as potential chemical sensors for electron-accepting gases such as chlorine. Our preliminary investigations using vacuum sublimed films of 5,10,15,20-tetraphenylporphin (H2TPP) have shown that a fluorescence decrease can be observed when the films are exposed to chlorine gas at low concentrations (ppm). Unfortunately vacuum sublimed films of H2TPP produce only a weak fluorescence emission. H2TPP dissolved in silicone rubber films exhibits a strong fluorescence emission which makes the films more suitable for optical measurement. In addition, the non-polar environment favours a protonation reaction in which H2TPP is converted to the diacid dication, H4TPP2+. This is the sensing interaction used to detect and measure chlorine gas which can be followed either by monitoring the fluorescence decrease from H2TPP or the fluorescence increase from H4TPP2+. Equilibration of the films does not occur, however, the interaction is suited to a kineto-optical method of measurement. The films respond quickly, reversibly and reproducibly with the kineto-optical method requiring only a short exposure period. © 1995.

Keywords:Chlorine, Fluorescence, Nitrogen compounds, Redox reactions, Rubber films, Silicones, Sublimation, Vacuum applications, Kinetooptical method, Protonation reaction, Tetraphenylporphin, Vacuum sublimed films, Chemical sensors
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Life Sciences
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ID Code:10579
Deposited On:10 Jul 2013 15:26

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