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001-es BibID:	BIBFORM073498
Első szerző:	Józsa Éva (vegyész, kémia tanár)
Cím:	Photochemical processes of 1,4-benzoquinones in aqueous medium / Józsa Éva, Kiss Virág, Ősz Katalin
Dátum:	2018
ISSN:	1010-6030
Megjegyzések:	The photochemical reactions in the aqueous solutions of 1,4-benzoquinone, 2-methyl-1,4-benzoquinone, 2,6-dimethyl-1,4-benzoquinone, 2-chloro-1,4-benzoquinone, 2,5-dichloro-1,4-benzoquinone and 2,6-dichloro-1,4-benzoquinone were investigated using three independent monitoring techniques (spectrophotometric, spectrofluorimetric and pH-stat) and two different radiation sources, a LED with emission at 400?nm and an UV-A lamp emitting at 365?nm. The aqueous photoproducts were shown to be the corresponding substituted hydroxyl-quinones and hydroquinones for all the derivatives. Fully quantitative data treatment was used in all of the experiments based on fitting the entire kinetic curved obtained. From these fits, the quantum yield of product formation and reactant loss were determined in each case. In the pH-stat experiments, the effect of pH change was also investigated for some of the derivatives. Generally, aqueous photoreactivity is increased by the presence of electron withdrawing substituents and suppressed by electron donating ones. The pH did not have a very significant influence on the course of the photoreaction alone, but it affected the observations through different acid-base equilibria of the products hydroxyl-quinones and hydroquinones.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban QuinonePhotochemistrypH-statFull kinetic curve fittingQuantum yield
Megjelenés:	Journal Of Photochemistry And Photobiology A-Chemistry. - 360 (2018), p. 166-173. -
További szerzők:	Kiss Virág (1991-) (vegyész) Ősz Katalin (1975-) (vegyész)
Pályázati támogatás:	OTKA-105156 OTKA GINOP-2.3.2-15-2016-00008 GINOP TÁMOP-4.2.4. A/2-11-1-2012-0001 TÁMOP
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