Chemiluminescence of solution of oxygen compounds of xenon

On the chemiluminescence in the oxidation of tetravalent uranium to the uranyl ion by dimethyldioxirane

“…Unfortunately, the intensity of the observed luminescence emission was too low to record the CL spectrum: the yield of CL was estimated to be 2.5 Â 10 À9 and 3 Â 10 À8 Einst/ mol in HClO 4 and H 2 SO 4 , respectively. However, analysis of the luminescence emission by means of cut-off light filters revealed that the CL released in the reaction of U(IV) with DMD lies in the spectral region 470-600 nm, in the presence of either HClO 4 or H 2 SO 4 (Fig.…”

“…Since the compounds of U(IV) persist better in acid medium than in water, solutions of the tetravalent uranium in weakly concentrated HClO 4 and H 2 SO 4 (0.1-2 mol/L) were used in the present study. The IR and Vis-CL emissions were recorded as follows.…”

“…Acetone solutions of DMD were transferred into the reaction cuvette, which was placed above the cathode of the photomultiplier. The aqueous solution of the uranium salt in HClO 4 or H 2 SO 4 was charged through an injector port, which was placed above the reaction cuvette with the DMD solution. The chemiluminescent chamber was hermetically sealed, the uranium solution was added to the DMD solution by means of rapid injection during ca.…”

“…We propose that this side reaction involves the catalytic decomposition of DMD by the U(IV) ions in the presence of either HClO 4 or H 2 SO 4 . In this context, it is known that dioxiranes are prone to rapid catalytic decomposition in the presence of electron donors (28).…”