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Effect of co-ligands on photoredox pathways in Cr(III) oxalate complexes


Effect of co-ligands on photoredox pathways in Cr(III) oxalate complexes

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dc.contributor.author Wiśniewska, Joanna pl
dc.contributor.author Marai, Hasan pl
dc.contributor.author Karocki, Andrzej pl
dc.contributor.author Stopa, Grzegorz [SAP11009008] pl
dc.contributor.author Kita, Ewa pl
dc.contributor.author Stasicka, Zofia pl
dc.date.accessioned 2015-09-07T14:50:44Z
dc.date.available 2015-09-07T14:50:44Z
dc.date.issued 2012 pl
dc.identifier.issn 1010-6030 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/15372
dc.language eng pl
dc.title Effect of co-ligands on photoredox pathways in Cr(III) oxalate complexes pl
dc.type JournalArticle pl
dc.description.physical 78-84 pl
dc.abstract.en The photochemical behaviour of some mixed ligand chromium(III) complexes with amino acids, [Cr(C 2 O 4 ) 2 (Aa)] n − (where Aa = alanine, valine, serine, cysteine, asparagine, aspartic acid) was studied. The attention was focused on the photoredox mode, which proceeded via inner- or intramolecular path- way yielding Cr(II) species and hydrated electrons, respectively. The secondary thermal processes were dependent on the O 2 presence and solution pH: (i) in oxygen-free media the regeneration of substrate and photoaquation induced by the Cr(III) → Cr(II) reduction were observed, (ii) in the presence of O 2 both Cr(II) and ligands were oxidized and the former was transformed not only into Cr(III) but also to Cr(VI) (provided that pH > 7). Prolonged irradiation resulted in photoreduction of Cr(VI) accompanied by pho- todegradation of oxalate and/or amino-acid ligands. The photoreaction modes were independent of the co-ligand nature, but the secondary reaction rates and efficiencies were sensitive both to the co-ligand nature and its side substituent. Environmental consequences of the chromium photoreduction are dis- cussed in the paper: the parameters affecting production and consumption of Cr(VI) are analysed, and the tools of controlling the photoredox behaviour of the Cr(III) and Cr(VI) compounds are suggested. pl
dc.subject.en chromium(III) complexes pl
dc.subject.en oxalate pl
dc.subject.en chromate(VI) pl
dc.subject.en amino acid pl
dc.subject.en photoinduced electron transfer pl
dc.subject.en photoreduction pl
dc.description.volume 250 pl
dc.description.points 25 pl
dc.identifier.doi 10.1016/j.jphotochem.2012.09.013 pl
dc.identifier.eissn 1873-2666 pl
dc.title.journal Journal of Photochemistry and Photobiology. A, Chemistry pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Nieorganicznej pl
dc.subtype Article pl
dc.rights.original bez licencji pl
.pointsMNiSW [2012 A]: 25

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