H-1-NMR MONITORING OF WATER BEHAVIOR DURING THE BRAY-LIEBHAFSKY OSCILLATORY REACTION

Proton NMR spectroscopy was used to monitor behavior of water during t he oscillatiory part of the Bray-Liebhafsky (BL) reaction. A series of H-1 NMR spectra showed the complex structure of the water signal with periodic changes of the chemical shift and line splitting, which were in agreement with the periodicity of the BL reaction obtained by pote ntiometric measurements. An analysis of known intermediates in the BL reaction indicated that oxygen formation both as dissolved and in form of bubbles has the dominant effect on NMR spectra. In addition, certa in restructuring of water was observed during oscillations, suggesting the subtle role of water in the mechanism of the BL reaction and poin ting out to the importance of the NMR techniques in investigation of t he chemical oscillators.