Comportement photochimique du 4-nitrosophénol en solution aqueuse

Autor:	Jean-Philippe Billard, Pierre Boule, Jean-François Pilichowski
Rok vydání:	1995
Předmět:	Aqueous solution Chemistry Organic Chemistry Quantum yield General Chemistry Nitroso Photochemistry High-performance liquid chromatography Tautomer Benzoquinone Catalysis Quinone chemistry.chemical_compound Absorption band
Zdroj:	Canadian Journal of Chemistry. 73:2143-2147
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v95-265
Popis:	In acidic medium (pH ≈ 1)4-nitrosophenol irradiated in the range 296–366 nm is mainly transformed into benzoquinone (75–80%). The quantum yield of this reaction is wavelength dependent: it is about 6 times higher at 365 nm than at λ ≤ 313 nm. This phenomenon is attributed to an equilibrium between two tautomeric forms, nitroso and quinone monooxime, the former being much more photoreactive than the latter. In unbuffered aqueous solution (pH = 5–6) the formation of an intermediate is observed. Its HPLC retention time is just a little shorter than that of benzoquinone and the maximum of its absorption band is located at 235 nm. The rate of transformation of this intermediate increases with decreasing pH. Keywords: photochemistry, 4-nitrosophenol, wavelength effect.
Databáze:	OpenAIRE
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