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Alexiou, Anamaria D P; Decandio, Carla C; Almeida, Sabrina da N; Ferreira, Marcelo J P; Romoff, Paulete; Rocha, Reginaldo C
Molecules (Basel, Switzerland), 04/2015, Letnik: 20, Številka: 4Journal Article
A new trinuclear oxo-centered chromium(III) complex with formula Cr3O(CH3CO2)6(L)(H2O)2 (L = 5-hydroxyflavone, known as primuletin) was synthetized and characterized by ESI mass spectrometry, thermogravimetry, and 1H-NMR, UV-Vis, and FTIR spectroscopies. In agreement with the experimental results, DFT calculations indicated that the flavonoid ligand is coordinated to one of the three Cr(III) centers in an O,O-bidentate mode through the 5-hydroxy/4-keto groups. In a comparative study involving the uncoordinated primuletin and its corresponding complex, systematic reactions with the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) showed that antiradical activity increases upon complexation.
