Repozytorium Uniwersytetu Jagiellońskiego
Effect of co-ligands on photoredox pathways in Cr(III) oxalate complexes
Effect of co-ligands on photoredox pathways in Cr(III) ...
Opis pozycji
| 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: | |
| 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 |
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