The Luminescence of Some Luminol Oxidation Products

Abstract

The oxidation of luminol with t‐butyl hypochlorite and the fluorescence and chemiluminescence of some of the products are herein reported. The fluorescence was studied in the present work as a function of pH and the spectral distribution was then recorded at the pH of maximum fluorescence intensity; the chemiluminescence spectrum was obtained under the conditions of the luminol‐chemiluminescence.

Hot electron-induced electrochemiluminescence of fluorescein in aqueous solution

“…If the assumed reduction potential above were correct, the reduction potential of Ox Å must be roughly higher than ca. 1.9 V vs. (entropy term ignored) to result in the excited product (12). Thus, hydroxyl radical is capable of carrying out this oxidation step up to about pH 12 [41], but azide radical clearly not in any pH range [34,42].…”

“…In addition, hydrated electron is well known not to follow Marcus electron transfer theory but is showing RehmWeller type of behavior [34] and thus it is capable of carrying out an extremely rapid reduction step (13) although the Gibbs free energy change in this excitation step is highly negative. On the other hand, the Gibbs free energy change of reaction (12) in case of hydroxyl, and even more clearly in the case of sulfate radical, is likely to be in the Marcus inverted region. Therefore, it cannot be fast and efficient.…”

“…Fluorescein is known to emit similar chemiluminescence emission spectrum to that of its fluorescence emission during treatment with ozone in ethanol and methanol [11] and in terbutanol [12]. This CL is known to consume both fluorescein and ozone.…”

Benzocyclobutenes. Part 4. Synthesis of benzocyclobutene-1,2-diones by pyrolytic methods

“…(CH,Cl,) 1 8 . 5 3 ~~ 1807s, 1779s, and 1763m cm-l. Pyrolysis of the anthracene adduct corresponding to (18) at 450 "C also gave traces of the yellow ketonic material but the 9-methylanthracene adduct corresponding to (18) underwent extensive decomposition at 215-220 "C even before it sublimed into the tube kept at…”

“…Pyrolysis of the Cyclopentadiene Adduct (18) .-The adduct was sublimcd at 220-225 "C and 0.01 mmHg through the tube kept at 500-525 "C. The pyrolysate consisted of unchanged adduct and a yellow solid which is described in the Discussion.…”