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

doi:10.1016/j.jphotochem.2012.09.013

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punktacja MNiSW [2012 A]: 25

tytuł	Effect of co-ligands on photoredox pathways in Cr(III) oxalate complexes
autor	Wiśniewska Joanna, Marai Hasan, Karocki Andrzej, Stopa Grzegorz , Kita Ewa, Stasicka Zofia
tytuł czasopisma	Journal of Photochemistry and Photobiology. A, Chemistry
tom	250
data wydania	2012
strony	78-84
ISSN	1010-6030
eISSN	1873-2666
DOI	10.1016/j.jphotochem.2012.09.013
język	angielski
język czasopisma	angielski
abstrakt w j. angielskim	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.
słowa kluczowe w j. angielskim	Chromium(III) complexes, Oxalate, Chromate(VI), Amino acid, Photoinduced electron transfer, Photoreduction
punktacja wydziałowa	25
wydział:instytut/zakład/katedra	Wydział Chemii : Zakład Chemii Nieorganicznej
typ	artykuł w czasopiśmie
podtyp	artykuł