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Exposite produce chemiluminescence when heated to 50 - 70 °C or treated with nucleophilic substances at room temperature. Initiation by Piperidine in Dimethylsulfoxide allows to determine 5 nmol of Phenyloxirane in 5 ml samples.
The reactions of diluted aqueous solutions of SO2 resp. HSO3-ions with MnO4-or Ce4+ ions in the pH range 1-4 produce chemiluminescence in the spectral region of 450-600 nm. Measurements of the time course of the light emission and their simulation on an analog computer led to a reaction scheme in which a recombination product of primarily formed HSO3 radicals -of a lifetime of about 1 second -appears as precursor of electronically excited SO2 molecules. The participation of singlet oxygen can be excluded because at least the reaction with Ce4+ ions proceeds also in the absence of oxygen.
The article investigates tonal, thematic, and textural aspects of sonata form in the movement structures of twenty-six symphonies from the 1730s and early-1740s by the Italian composer Antonio Brioschi (active ca. 1725–ca. 1750). It discusses expository events as well as aspects of development and recapitulation of the musical material. In addition, the article provides an account of the major eighteenth-century manuscript source of the works—a French collection known as Fonds Blancheton—and considers some general stylistic characteristics of the music.